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DOE OSTI2020

Materials Data on Mg5Si6 by Materials Project

Mg5Si6 is Magnesium tetraboride-like structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are ten inequivalent Mg sites. In the first Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.96 Å. In the second Mg site, Mg is bonded in a 7-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.09 Å. In the third Mg site, Mg is bonded in a 8-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.14 Å. In the fourth Mg site, Mg is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.00 Å. In the fifth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.83 Å. In the sixth Mg site, Mg is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.00 Å. In the seventh Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.67–3.05 Å. In the eighth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–3.01 Å. In the ninth Mg site, Mg is bonded to five Si atoms to form distorted MgSi5 trigonal bipyramids that share a cornercorner with one SiMg5Si3 hexagonal bipyramid and corners with two equivalent MgSi5 trigonal bipyramids. There are a spread of Mg–Si bond distances ranging from 2.74–2.81 Å. In the tenth Mg site, Mg is bonded in a 7-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.12 Å. There are twelve inequivalent Si sites. In the first Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.39 Å) and one longer (2.43 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. The Si–Si bond length is 2.45 Å. In the third Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.39–2.43 Å. In the fourth Si site, Si is bonded in a 6-coordinate geometry to four Mg and two Si atoms. The Si–Si bond length is 2.45 Å. In the fifth Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. There are one shorter (2.39 Å) and one longer (2.49 Å) Si–Si bond lengths. In the sixth Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. There are one shorter (2.42 Å) and one longer (2.43 Å) Si–Si bond lengths. In the seventh Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. The Si–Si bond length is 2.51 Å. In the eighth Si site, Si is bonded to five Mg and three Si atoms to form distorted SiMg5Si3 hexagonal bipyramids that share corners with two equivalent SiMg5Si3 hexagonal bipyramids and a cornercorner with one MgSi5 trigonal bipyramid. There are one shorter (2.41 Å) and one longer (2.42 Å) Si–Si bond lengths. In the ninth Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. In the tenth Si site, Si is bonded in a 6-coordinate geometry to four Mg and two Si atoms. In the eleventh Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. In the twelfth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg5Si6 by Materials Project

Mg5Si6 is delta Molybdenum Boride-like structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are ten inequivalent Mg sites. In the first Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.82–3.06 Å. In the second Mg site, Mg is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–2.96 Å. In the third Mg site, Mg is bonded in a 6-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.13 Å. In the fourth Mg site, Mg is bonded in a 3-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.63–3.07 Å. In the fifth Mg site, Mg is bonded in a 4-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.11 Å. In the sixth Mg site, Mg is bonded in a 7-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.10 Å. In the seventh Mg site, Mg is bonded in a 6-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.84–3.21 Å. In the eighth Mg site, Mg is bonded in a 3-coordinate geometry to nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.09 Å. In the ninth Mg site, Mg is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–2.96 Å. In the tenth Mg site, Mg is bonded in a 12-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.74–2.96 Å. There are twelve inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.48 Å) and one longer (2.53 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 6-coordinate geometry to four Mg and two Si atoms. The Si–Si bond length is 2.39 Å. In the third Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.58–2.75 Å. In the fourth Si site, Si is bonded in a 10-coordinate geometry to five Mg and five Si atoms. There are a spread of Si–Si bond distances ranging from 2.40–2.76 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.46–2.59 Å. In the sixth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.34 Å) and one longer (2.48 Å) Si–Si bond lengths. In the seventh Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. The Si–Si bond length is 2.40 Å. In the eighth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. The Si–Si bond length is 2.48 Å. In the ninth Si site, Si is bonded in a 6-coordinate geometry to four Mg and two Si atoms. In the tenth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. In the eleventh Si site, Si is bonded in a 11-coordinate geometry to seven Mg and four Si atoms. In the twelfth Si site, Si is bonded in a 7-coordinate geometry to five Mg and two equivalent Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb10NaAl11Si13O48 by Materials Project

Rb10NaAl11Si13O48 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are ten inequivalent Rb sites. In the first Rb site, Rb is bonded in a 1-coordinate geometry to two O atoms. There are one shorter (2.81 Å) and one longer (3.00 Å) Rb–O bond lengths. In the second Rb site, Rb is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Rb–O bond distances ranging from 2.70–3.26 Å. In the third Rb site, Rb is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Rb–O bond distances ranging from 2.76–3.24 Å. In the fourth Rb site, Rb is bonded to five O atoms to form distorted RbO5 trigonal bipyramids that share corners with two SiO4 tetrahedra and edges with four AlO4 tetrahedra. There are a spread of Rb–O bond distances ranging from 2.84–3.25 Å. In the fifth Rb site, Rb is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Rb–O bond distances ranging from 2.94–3.26 Å. In the sixth Rb site, Rb is bonded in a 3-coordinate geometry to five O atoms. There are a spread of Rb–O bond distances ranging from 2.58–3.30 Å. In the seventh Rb site, Rb is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Rb–O bond distances ranging from 2.70–3.22 Å. In the eighth Rb site, Rb is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Rb–O bond distances ranging from 2.74–3.06 Å. In the ninth Rb site, Rb is bonded in a 1-coordinate geometry to one O atom. The Rb–O bond length is 2.61 Å. In the tenth Rb site, Rb is bonded in a 3-coordinate geometry to three O atoms. There are a spread of Rb–O bond distances ranging from 2.82–3.28 Å. Na is bonded in a distorted trigonal non-coplanar geometry to three O atoms. There are a spread of Na–O bond distances ranging from 2.23–2.31 Å. There are eleven inequivalent Al sites. In the first Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.75–1.79 Å. In the second Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.73–1.80 Å. In the third Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra, corners with three AlO4 tetrahedra, and an edgeedge with one RbO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.72–1.82 Å. In the fourth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra and corners with three AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.73–1.82 Å. In the fifth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra, corners with three AlO4 tetrahedra, and an edgeedge with one RbO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.74–1.80 Å. In the sixth Al site, Al is bonded to four O atoms to form corner-sharing AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.73–1.79 Å. In the seventh Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two AlO4 tetrahedra, corners with two SiO4 tetrahedra, and an edgeedge with one RbO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.70–1.83 Å. In the eighth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra, corners with three AlO4 tetrahedra, and an edgeedge with one RbO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.72–1.80 Å. In the ninth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.70–1.83 Å. In the tenth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra and corners with three AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.71–1.80 Å. In the eleventh Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.74–1.78 Å. There are thirteen inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.67 Å. In the third Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.60–1.65 Å. In the fourth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.60–1.67 Å. In the fifth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra, corners with two SiO4 tetrahedra, and a cornercorner with one RbO5 trigonal bipyramid. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. In the sixth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. In the seventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra, corners with two SiO4 tetrahedra, and a cornercorner with one RbO5 trigonal bipyramid. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. In the eighth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.65 Å. In the ninth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.59–1.67 Å. In the tenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.65 Å. In the eleventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. In the twelfth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.59–1.67 Å. In the thirteenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.60–1.68 Å. There are forty-eight inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the second O site, O is bonded in a distorted bent 150 degrees geometry to two Si atoms. In the third O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the fourth O site, O is bonded in a bent 150 degrees geometry to one Rb and two Si atoms. In the fifth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the sixth O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the seventh O site, O is bonded in a 2-coordinate geometry to two Rb and two Al atoms. In the eighth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the ninth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the tenth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the eleventh O site, O is bonded in a distorted bent 150 degrees geometry to one Rb and two Si atoms. In the twelfth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the thirteenth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb and two Si atoms. In the fourteenth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the fifteenth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the sixteenth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the seventeenth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the eighteenth O site, O is bonded in a linear geometry to one Rb and two Si atoms. In the nineteenth O site, O is bonded in a linear geometry to two Si atoms. In the twentieth O site, O is bonded in a linear geometry to one Rb and two Si atoms. In the twenty-first O site, O is bonded in a linear geometry to two Rb, one Al, and one Si atom. In the twenty-second O site, O is bonded in a linear geometry to two Si atoms. In the twenty-third O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the twenty-fourth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the twenty-fifth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the twenty-sixth O site, O is bonded in a bent 120 degrees geometry to one Rb, one Al, and one Si atom. In the twenty-seventh O site, O is bonded in a bent 120 degrees geometry to one Rb, one Al, and one Si atom. In the twenty-eighth O site, O is bonded in a distorted bent 120 degrees geometry to one Rb, one Al, and one Si atom. In the twenty-ninth O site, O is bonded in a distorted bent 120 degrees geometry to one Rb and two Al atoms. In the thirtieth O site, O is bonded in a 3-coordinate geometry to one Rb and two Al atoms. In the thirty-first O site, O is bonded in a distorted bent 150 degrees geometry to one Rb and two Al atoms. In the thirty-second O site, O is bonded in a distorted T-shaped geometry to one Rb and two Al atoms. In the thirty-third O site, O is bonded in a 4-coordinate geometry to one Rb, one Na, and two Al atoms. In the thirty-fourth O site, O is bonded in a distorted bent 150 degrees geometry to three Rb and two Al atoms. In the thirty-fifth O site, O is bonded in a distorted bent 150 degrees geometry to two Rb and two Al atoms. In the thirty-sixth O site, O is bonded in a distorted bent 150 degrees geometry to three Rb and two Al atoms. In the thirty-seventh O site, O is bonded in a distorted bent 150 degrees geometry to two Rb and two Al atoms. In the thirty-eighth O site, O is bonded in a distorted linear geometry to one Rb and two Al atoms. In the thirty-ninth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb and two Al atoms. In the fortieth O site, O is bonded in a 2-coordinate geometry to two Rb, one Al, and one Si atom. In the forty-first O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the forty-second O site, O is bonded in a 4-coordinate geometry to two Rb, one Al, and one Si atom. In the forty-third O site, O is bonded in a 2-coordinate geometry to two Rb, one Al, and one Si atom. In the forty-fourth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the forty-fifth O site, O is bonded in a 3-coord

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg9Si5 by Materials Project

Mg9Si5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eighteen inequivalent Mg sites. In the first Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.05 Å. In the second Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.06 Å. In the third Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–2.97 Å. In the fourth Mg site, Mg is bonded in a 3-coordinate geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.78–2.93 Å. In the fifth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–2.96 Å. In the sixth Mg site, Mg is bonded to four Si atoms to form distorted corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.69–2.79 Å. In the seventh Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.98 Å. In the eighth Mg site, Mg is bonded in a distorted see-saw-like geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–2.77 Å. In the ninth Mg site, Mg is bonded in a distorted single-bond geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.26 Å. In the tenth Mg site, Mg is bonded in a 3-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.62–3.02 Å. In the eleventh Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.65–2.80 Å. In the twelfth Mg site, Mg is bonded in a 3-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.84–3.19 Å. In the thirteenth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.70–2.85 Å. In the fourteenth Mg site, Mg is bonded to five Si atoms to form distorted corner-sharing MgSi5 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.73–3.20 Å. In the fifteenth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.86–3.16 Å. In the sixteenth Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.87–3.24 Å. In the seventeenth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.82–3.12 Å. In the eighteenth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.03 Å. There are ten inequivalent Si sites. In the first Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. The Si–Si bond length is 2.45 Å. In the second Si site, Si is bonded in a 10-coordinate geometry to nine Mg and one Si atom. The Si–Si bond length is 2.79 Å. In the third Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the fourth Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the fifth Si site, Si is bonded in a 10-coordinate geometry to seven Mg and three Si atoms. There are one shorter (2.66 Å) and one longer (2.76 Å) Si–Si bond lengths. In the sixth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. The Si–Si bond length is 2.67 Å. In the seventh Si site, Si is bonded in a 10-coordinate geometry to nine Mg and one Si atom. In the eighth Si site, Si is bonded in a 5-coordinate geometry to eight Mg and one Si atom. In the ninth Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the tenth Si site, Si is bonded in a 5-coordinate geometry to six Mg and one Si atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba4Cu2Si21 by Materials Project

Ba4Cu2Si21 crystallizes in the orthorhombic Ama2 space group. The structure is three-dimensional. there are four inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to twenty Si+0.57- atoms. There are a spread of Ba–Si bond distances ranging from 3.29–3.51 Å. In the second Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight Si+0.57- atoms. There are a spread of Ba–Si bond distances ranging from 3.38–3.60 Å. In the third Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight Si+0.57- atoms. There are a spread of Ba–Si bond distances ranging from 3.40–3.59 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight Si+0.57- atoms. There are a spread of Ba–Si bond distances ranging from 3.38–3.61 Å. There are two inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded in a tetrahedral geometry to four Si+0.57- atoms. All Cu–Si bond lengths are 2.39 Å. In the second Cu2+ site, Cu2+ is bonded in a tetrahedral geometry to four Si+0.57- atoms. There are two shorter (2.35 Å) and two longer (2.36 Å) Cu–Si bond lengths. There are thirteen inequivalent Si+0.57- sites. In the first Si+0.57- site, Si+0.57- is bonded in a distorted tetrahedral geometry to four Si+0.57- atoms. There are a spread of Si–Si bond distances ranging from 2.43–2.46 Å. In the second Si+0.57- site, Si+0.57- is bonded in a 8-coordinate geometry to three Ba2+, one Cu2+, and three Si+0.57- atoms. There are two shorter (2.40 Å) and one longer (2.49 Å) Si–Si bond lengths. In the third Si+0.57- site, Si+0.57- is bonded in a 7-coordinate geometry to three Ba2+ and four Si+0.57- atoms. There are two shorter (2.41 Å) and one longer (2.52 Å) Si–Si bond lengths. In the fourth Si+0.57- site, Si+0.57- is bonded in a 5-coordinate geometry to one Ba2+ and four Si+0.57- atoms. There are a spread of Si–Si bond distances ranging from 2.36–2.42 Å. In the fifth Si+0.57- site, Si+0.57- is bonded in a 8-coordinate geometry to one Ba2+ and four Si+0.57- atoms. There are a spread of Si–Si bond distances ranging from 2.38–2.42 Å. In the sixth Si+0.57- site, Si+0.57- is bonded in a 8-coordinate geometry to one Ba2+ and four Si+0.57- atoms. There are a spread of Si–Si bond distances ranging from 2.37–2.42 Å. In the seventh Si+0.57- site, Si+0.57- is bonded in a 8-coordinate geometry to one Ba2+ and four Si+0.57- atoms. Both Si–Si bond lengths are 2.42 Å. In the eighth Si+0.57- site, Si+0.57- is bonded in a 7-coordinate geometry to three Ba2+, one Cu2+, and three Si+0.57- atoms. The Si–Si bond length is 2.47 Å. In the ninth Si+0.57- site, Si+0.57- is bonded in a 7-coordinate geometry to three Ba2+ and four Si+0.57- atoms. The Si–Si bond length is 2.48 Å. In the tenth Si+0.57- site, Si+0.57- is bonded in a 7-coordinate geometry to three Ba2+ and four Si+0.57- atoms. In the eleventh Si+0.57- site, Si+0.57- is bonded in a 7-coordinate geometry to three Ba2+, one Cu2+, and three Si+0.57- atoms. The Si–Si bond length is 2.50 Å. In the twelfth Si+0.57- site, Si+0.57- is bonded in a 8-coordinate geometry to three Ba2+, one Cu2+, and three Si+0.57- atoms. In the thirteenth Si+0.57- site, Si+0.57- is bonded in a 8-coordinate geometry to three Ba2+, one Cu2+, and three Si+0.57- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg9Si5 by Materials Project

Mg9Si5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eighteen inequivalent Mg sites. In the first Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.05 Å. In the second Mg site, Mg is bonded to four Si atoms to form a mixture of distorted edge and corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.71–2.76 Å. In the third Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.13 Å. In the fourth Mg site, Mg is bonded to four Si atoms to form a mixture of distorted edge and corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.75–2.80 Å. In the fifth Mg site, Mg is bonded in a distorted single-bond geometry to two Si atoms. There are one shorter (2.80 Å) and one longer (3.16 Å) Mg–Si bond lengths. In the sixth Mg site, Mg is bonded to four Si atoms to form a mixture of distorted edge and corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.72–2.79 Å. In the seventh Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–2.94 Å. In the eighth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–2.90 Å. In the ninth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.83–2.91 Å. In the tenth Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–3.10 Å. In the eleventh Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.82–2.91 Å. In the twelfth Mg site, Mg is bonded in a distorted trigonal non-coplanar geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–3.16 Å. In the thirteenth Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–3.15 Å. In the fourteenth Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.02 Å. In the fifteenth Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–3.19 Å. In the sixteenth Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.13 Å. In the seventeenth Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–3.12 Å. In the eighteenth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.85–2.94 Å. There are ten inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. The Si–Si bond length is 2.57 Å. In the second Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the third Si site, Si is bonded in a 10-coordinate geometry to ten Mg atoms. In the fourth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. There are one shorter (2.48 Å) and one longer (2.54 Å) Si–Si bond lengths. In the fifth Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the sixth Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. In the seventh Si site, Si is bonded in a 7-coordinate geometry to six Mg and one Si atom. The Si–Si bond length is 2.46 Å. In the eighth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. In the ninth Si site, Si is bonded in a 10-coordinate geometry to nine Mg and one Si atom. The Si–Si bond length is 2.51 Å. In the tenth Si site, Si is bonded in a 7-coordinate geometry to six Mg and one Si atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrHo31Al2Si14N13O59 by Materials Project

SrHo31Al2Si14N13O59 crystallizes in the triclinic P1 space group. The structure is three-dimensional. Sr is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Sr–O bond distances ranging from 2.32–2.71 Å. There are thirty-one inequivalent Ho sites. In the first Ho site, Ho is bonded in a 6-coordinate geometry to one N and five O atoms. The Ho–N bond length is 2.27 Å. There are a spread of Ho–O bond distances ranging from 2.12–2.65 Å. In the second Ho site, Ho is bonded in a 7-coordinate geometry to one N and six O atoms. The Ho–N bond length is 2.63 Å. There are a spread of Ho–O bond distances ranging from 2.18–2.46 Å. In the third Ho site, Ho is bonded in a 8-coordinate geometry to one N and seven O atoms. The Ho–N bond length is 2.63 Å. There are a spread of Ho–O bond distances ranging from 2.21–3.07 Å. In the fourth Ho site, Ho is bonded in a 6-coordinate geometry to one N and five O atoms. The Ho–N bond length is 2.81 Å. There are a spread of Ho–O bond distances ranging from 2.21–2.46 Å. In the fifth Ho site, Ho is bonded in a 7-coordinate geometry to one N and five O atoms. The Ho–N bond length is 2.25 Å. There are a spread of Ho–O bond distances ranging from 2.18–2.61 Å. In the sixth Ho site, Ho is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ho–O bond distances ranging from 2.14–2.47 Å. In the seventh Ho site, Ho is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ho–O bond distances ranging from 2.16–2.60 Å. In the eighth Ho site, Ho is bonded in a 7-coordinate geometry to one N and six O atoms. The Ho–N bond length is 2.65 Å. There are a spread of Ho–O bond distances ranging from 2.19–2.54 Å. In the ninth Ho site, Ho is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ho–O bond distances ranging from 2.22–2.65 Å. In the tenth Ho site, Ho is bonded in a 4-coordinate geometry to four O atoms. There are a spread of Ho–O bond distances ranging from 2.13–2.28 Å. In the eleventh Ho site, Ho is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ho–O bond distances ranging from 2.23–2.60 Å. In the twelfth Ho site, Ho is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ho–O bond distances ranging from 2.19–2.51 Å. In the thirteenth Ho site, Ho is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ho–O bond distances ranging from 2.18–2.44 Å. In the fourteenth Ho site, Ho is bonded in a 8-coordinate geometry to one N and seven O atoms. The Ho–N bond length is 2.64 Å. There are a spread of Ho–O bond distances ranging from 2.21–2.82 Å. In the fifteenth Ho site, Ho is bonded in a 5-coordinate geometry to one N and four O atoms. The Ho–N bond length is 2.43 Å. There are a spread of Ho–O bond distances ranging from 2.19–2.31 Å. In the sixteenth Ho site, Ho is bonded in a 6-coordinate geometry to two N and four O atoms. There are one shorter (2.17 Å) and one longer (2.39 Å) Ho–N bond lengths. There are a spread of Ho–O bond distances ranging from 2.19–2.71 Å. In the seventeenth Ho site, Ho is bonded in a distorted see-saw-like geometry to four O atoms. There are a spread of Ho–O bond distances ranging from 2.09–2.35 Å. In the eighteenth Ho site, Ho is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ho–O bond distances ranging from 2.21–2.64 Å. In the nineteenth Ho site, Ho is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ho–O bond distances ranging from 2.12–2.92 Å. In the twentieth Ho site, Ho is bonded in a 7-coordinate geometry to one N and six O atoms. The Ho–N bond length is 2.27 Å. There are a spread of Ho–O bond distances ranging from 2.17–3.08 Å. In the twenty-first Ho site, Ho is bonded in a 4-coordinate geometry to two N and three O atoms. There are one shorter (2.33 Å) and one longer (2.87 Å) Ho–N bond lengths. There are a spread of Ho–O bond distances ranging from 2.05–2.40 Å. In the twenty-second Ho site, Ho is bonded in a 6-coordinate geometry to three N and three O atoms. There are one shorter (2.40 Å) and two longer (2.41 Å) Ho–N bond lengths. There are two shorter (2.21 Å) and one longer (2.61 Å) Ho–O bond lengths. In the twenty-third Ho site, Ho is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ho–O bond distances ranging from 2.21–2.75 Å. In the twenty-fourth Ho site, Ho is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ho–O bond distances ranging from 2.15–2.79 Å. In the twenty-fifth Ho site, Ho is bonded in a 6-coordinate geometry to one N and five O atoms. The Ho–N bond length is 2.39 Å. There are a spread of Ho–O bond distances ranging from 2.18–2.48 Å. In the twenty-sixth Ho site, Ho is bonded in a 6-coordinate geometry to one N and five O atoms. The Ho–N bond length is 2.33 Å. There are a spread of Ho–O bond distances ranging from 2.18–2.54 Å. In the twenty-seventh Ho site, Ho is bonded in a 7-coordinate geometry to two N and five O atoms. There are one shorter (2.34 Å) and one longer (2.73 Å) Ho–N bond lengths. There are a spread of Ho–O bond distances ranging from 2.18–2.75 Å. In the twenty-eighth Ho site, Ho is bonded to one N and six O atoms to form distorted HoNO6 pentagonal bipyramids that share a cornercorner with one SiNO3 tetrahedra, a cornercorner with one OHo3N tetrahedra, and an edgeedge with one SiNO3 tetrahedra. The Ho–N bond length is 2.40 Å. There are a spread of Ho–O bond distances ranging from 2.20–2.60 Å. In the twenty-ninth Ho site, Ho is bonded in a 7-coordinate geometry to two N and five O atoms. There are one shorter (2.52 Å) and one longer (2.60 Å) Ho–N bond lengths. There are a spread of Ho–O bond distances ranging from 2.29–2.44 Å. In the thirtieth Ho site, Ho is bonded in a 7-coordinate geometry to four N and four O atoms. There are a spread of Ho–N bond distances ranging from 2.20–3.13 Å. There are a spread of Ho–O bond distances ranging from 2.21–2.76 Å. In the thirty-first Ho site, Ho is bonded in a 3-coordinate geometry to one N and three O atoms. The Ho–N bond length is 2.53 Å. There are one shorter (2.08 Å) and two longer (2.13 Å) Ho–O bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded to one N and three O atoms to form AlNO3 tetrahedra that share corners with two SiNO3 tetrahedra. The Al–N bond length is 1.84 Å. There are a spread of Al–O bond distances ranging from 1.77–1.85 Å. In the second Al site, Al is bonded in a tetrahedral geometry to one N and three O atoms. The Al–N bond length is 1.89 Å. There is two shorter (1.77 Å) and one longer (1.81 Å) Al–O bond length. There are fourteen inequivalent Si sites. In the first Si site, Si is bonded in a distorted trigonal non-coplanar geometry to one N and two O atoms. The Si–N bond length is 1.71 Å. There is one shorter (1.68 Å) and one longer (1.73 Å) Si–O bond length. In the second Si site, Si is bonded to one N and three O atoms to form SiNO3 tetrahedra that share an edgeedge with one HoNO6 pentagonal bipyramid. The Si–N bond length is 1.73 Å. There is two shorter (1.66 Å) and one longer (1.68 Å) Si–O bond length. In the third Si site, Si is bonded to two N and two O atoms to form corner-sharing SiN2O2 tetrahedra. There is one shorter (1.73 Å) and one longer (1.75 Å) Si–N bond length. There is one shorter (1.64 Å) and one longer (1.69 Å) Si–O bond length. In the fourth Si site, Si is bonded to one N and three O atoms to form edge-sharing SiNO3 tetrahedra. The Si–N bond length is 1.72 Å. There are a spread of Si–O bond distances ranging from 1.64–1.72 Å. In the fifth Si site, Si is bonded in a distorted trigonal non-coplanar geometry to one N and two O atoms. The Si–N bond length is 1.80 Å. There is one shorter (1.69 Å) and one longer (1.73 Å) Si–O bond length. In the sixth Si site, Si is bonded to two N and two O atoms to form corner-sharing SiN2O2 tetrahedra. There is one shorter (1.70 Å) and one longer (1.74 Å) Si–N bond length. There is one shorter (1.65 Å) and one longer (1.68 Å) Si–O bond length. In the seventh Si site, Si is bonded to one N and three O atoms to form corner-sharing SiNO3 tetrahedra. The Si–N bond length is 1.74 Å. There are a spread of Si–O bond distances ranging from 1.62–1.72 Å. In the eighth Si site, Si is bonded in a trigonal non-coplanar geometry to three O atoms. All Si–O bond lengths are 1.66 Å. In the ninth Si site, Si is bonded in a distorted trigonal planar geometry to two N and one O atom. There is one shorter (1.63 Å) and one longer (1.66 Å) Si–N bond length. The Si–O bond length is 1.63 Å. In the tenth Si site, Si is bonded to one N and three O atoms to form corner-sharing SiNO3 tetrahedra. The Si–N bond length is 1.71 Å. There are a spread of Si–O bond distances ranging from 1.62–1.68 Å. In the eleventh Si site, Si is bonded to two N and two O atoms to form SiN2O2 tetrahedra that share a cornercorner with one AlNO3 tetrahedra and an edgeedge with one SiNO3 tetrahedra. There is one shorter (1.65 Å) and one longer (1.74 Å) Si–N bond length. There is one shorter (1.73 Å) and one longer (1.74 Å) Si–O bond length. In the twelfth Si site, Si is bonded to one N and three O atoms to form SiNO3 tetrahedra that share a cornercorner with one AlNO3 tetrahedra and a cornercorner with one SiNO3 tetrahedra. The Si–N bond length is 1.71 Å. There are a spread of Si–O bond distances ranging from 1.66–1.70 Å. In the thirteenth Si site, Si is bonded to one N and three O atoms to form SiNO3 tetrahedra that share a cornercorner with one HoNO6 pentagonal bipyramid and a cornercorner with one SiN2O2 tetrahedra. The Si–N bond length is 1.72 Å. There are a spread of Si–O bond distances ranging from 1.64–1.67 Å. In the fourteenth Si site, Si is bonded in a trigonal non-coplanar geometry to two N and one O atom. Both Si–N bond lengths are 1.81 Å. The Si–O bond length is 1.70 Å. There are thirteen inequivalent N sites. In the first N site, N is bonded in a 2-coordinate geometry to one Ho and two Si atoms. In the second N site, N is bonded in a distorted T-shaped geometry to one Ho and two Si atoms. In the third N site, N is bonded in a distorted water-like geometry to two Ho, one Al, and one Si atom. In the fourth N site, N is bonded in a 4-coordinate geometry to two Ho and two Si atoms. In the fifth N site, N is bonded in a 4-coordinate geometry to three Ho and one Si atom. In the sixth N site, N is bonded in a 4-coordinate geometry to two Ho, one Si, and one O atom. The N–O bond length is 1.49 Å. In the seventh N site, N is bonded to three Ho and one Si atom to form distorted NHo3Si tetrahedra that share a cornercorner with one NHo3Si tetrahedra, a cornercorner with one OHo3Si trigonal pyramid, and an edgeedge with one OSrHo2Si trigonal pyramid. In the eighth N site, N is bonded to three Ho and one Si atom to form distorted NHo3Si tetrahedra that share a cornercorner with one NHo3Si tetrahedra, a cornercorner with one OHo4 tetrahedra, and a cornercorner with one OHo3Si trigonal pyramid. In the ninth N site, N is bonded in a 4-coordinate geometry to two Ho and two Si atoms. In the tenth N site, N is bonded in a 4-coordinate geometry to two Ho, one Si, and one O atom. The N–O bond length is 1.49 Å. In the eleventh N site, N is bonded in a 5-coordinate geometry to three Ho, one Al, and one Si atom. In the twelfth N site, N is bonded in a 2-coordinate geometry to three Ho, one Si, and one O atom. The N–O bond length is 1.53 Å. In the thirteenth N site, N is bonded in a distorted water-like geometry to one Ho and two Si atoms. There are fifty-nine inequivalent O sites. In the first O site, O is bonded in a 4-coordinate geometry to one Sr, two Ho, and one Si atom. In the second O site, O is bonded to one Sr, two Ho, and one Si atom to form distorted OSrHo2Si trigonal pyramids that share an edgeedge with one NHo3Si tetrahedra and an edgeedge with one OHo3Si trigonal pyramid. In the third O site, O is bonded to three Ho and one Si atom to form distorted O

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg9Si5 by Materials Project

Mg9Si5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eighteen inequivalent Mg sites. In the first Mg site, Mg is bonded in a 3-coordinate geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–3.05 Å. In the second Mg site, Mg is bonded in a 2-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.55–3.23 Å. In the third Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.16 Å. In the fourth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.88 Å. In the fifth Mg site, Mg is bonded in a 3-coordinate geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–3.02 Å. In the sixth Mg site, Mg is bonded to four Si atoms to form a mixture of distorted edge and corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.64–2.79 Å. In the seventh Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.82–3.08 Å. In the eighth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–2.96 Å. In the ninth Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.19 Å. In the tenth Mg site, Mg is bonded to four Si atoms to form distorted corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.69–2.77 Å. In the eleventh Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.78–3.23 Å. In the twelfth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.81–2.95 Å. In the thirteenth Mg site, Mg is bonded to four Si atoms to form a mixture of distorted edge and corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.80–2.86 Å. In the fourteenth Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.11 Å. In the fifteenth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–2.87 Å. In the sixteenth Mg site, Mg is bonded in a 2-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.64–3.05 Å. In the seventeenth Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.66–2.85 Å. In the eighteenth Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.20 Å. There are ten inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. The Si–Si bond length is 2.67 Å. In the second Si site, Si is bonded in a 2-coordinate geometry to six Mg and two Si atoms. The Si–Si bond length is 2.56 Å. In the third Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.49 Å) and one longer (2.58 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. In the fifth Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the sixth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. The Si–Si bond length is 2.45 Å. In the seventh Si site, Si is bonded in a 8-coordinate geometry to eight Mg atoms. In the eighth Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the ninth Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. In the tenth Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb9Na2Al11Si13O48 by Materials Project

Rb9Na2Al11Si13O48 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are nine inequivalent Rb sites. In the first Rb site, Rb is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Rb–O bond distances ranging from 2.87–3.52 Å. In the second Rb site, Rb is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Rb–O bond distances ranging from 2.74–3.21 Å. In the third Rb site, Rb is bonded in a distorted rectangular see-saw-like geometry to four O atoms. There are a spread of Rb–O bond distances ranging from 2.80–3.36 Å. In the fourth Rb site, Rb is bonded to five O atoms to form distorted RbO5 trigonal bipyramids that share corners with two SiO4 tetrahedra and edges with four AlO4 tetrahedra. There are a spread of Rb–O bond distances ranging from 2.84–3.26 Å. In the fifth Rb site, Rb is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Rb–O bond distances ranging from 2.65–3.16 Å. In the sixth Rb site, Rb is bonded in a 4-coordinate geometry to five O atoms. There are a spread of Rb–O bond distances ranging from 2.63–3.30 Å. In the seventh Rb site, Rb is bonded in a 2-coordinate geometry to four O atoms. There are a spread of Rb–O bond distances ranging from 2.81–3.30 Å. In the eighth Rb site, Rb is bonded in a 4-coordinate geometry to two O atoms. There are one shorter (2.70 Å) and one longer (2.76 Å) Rb–O bond lengths. In the ninth Rb site, Rb is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Rb–O bond distances ranging from 3.02–3.52 Å. There are two inequivalent Na sites. In the first Na site, Na is bonded in a 3-coordinate geometry to three O atoms. There are one shorter (2.25 Å) and two longer (2.31 Å) Na–O bond lengths. In the second Na site, Na is bonded in a distorted rectangular see-saw-like geometry to four O atoms. There are a spread of Na–O bond distances ranging from 2.22–2.38 Å. There are eleven inequivalent Al sites. In the first Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.75–1.78 Å. In the second Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There is one shorter (1.76 Å) and three longer (1.78 Å) Al–O bond length. In the third Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra, corners with three AlO4 tetrahedra, and an edgeedge with one RbO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.72–1.80 Å. In the fourth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra and corners with three AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.72–1.83 Å. In the fifth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra, corners with three AlO4 tetrahedra, and an edgeedge with one RbO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.72–1.80 Å. In the sixth Al site, Al is bonded to four O atoms to form corner-sharing AlO4 tetrahedra. There is three shorter (1.75 Å) and one longer (1.78 Å) Al–O bond length. In the seventh Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two AlO4 tetrahedra, corners with two SiO4 tetrahedra, and an edgeedge with one RbO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.70–1.79 Å. In the eighth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra, corners with three AlO4 tetrahedra, and an edgeedge with one RbO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.71–1.81 Å. In the ninth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.72–1.82 Å. In the tenth Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra and corners with three AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.72–1.78 Å. In the eleventh Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.75–1.78 Å. There are thirteen inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.64 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.60–1.64 Å. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one SiO4 tetrahedra and corners with three AlO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.67 Å. In the fourth Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. In the fifth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.60–1.65 Å. In the sixth Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. In the seventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.68 Å. In the eighth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra, corners with two SiO4 tetrahedra, and a cornercorner with one RbO5 trigonal bipyramid. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. In the ninth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.65 Å. In the tenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra, corners with two SiO4 tetrahedra, and a cornercorner with one RbO5 trigonal bipyramid. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. In the eleventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.60–1.67 Å. In the twelfth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There is one shorter (1.62 Å) and three longer (1.64 Å) Si–O bond length. In the thirteenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.66 Å. There are forty-eight inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the second O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the third O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the fourth O site, O is bonded in a distorted bent 150 degrees geometry to two Rb, one Al, and one Si atom. In the fifth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the sixth O site, O is bonded in a bent 150 degrees geometry to one Rb and two Si atoms. In the seventh O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the eighth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the ninth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the tenth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb and two Si atoms. In the eleventh O site, O is bonded in a distorted linear geometry to one Rb, one Al, and one Si atom. In the twelfth O site, O is bonded in a bent 150 degrees geometry to one Rb and two Si atoms. In the thirteenth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb and two Si atoms. In the fourteenth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the fifteenth O site, O is bonded in a bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the sixteenth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the seventeenth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the eighteenth O site, O is bonded in a linear geometry to one Rb and two Si atoms. In the nineteenth O site, O is bonded in a linear geometry to two Si atoms. In the twentieth O site, O is bonded in a distorted linear geometry to one Rb and two Si atoms. In the twenty-first O site, O is bonded in a distorted linear geometry to one Rb, one Al, and one Si atom. In the twenty-second O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the twenty-third O site, O is bonded in a linear geometry to two Si atoms. In the twenty-fourth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the twenty-fifth O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the twenty-sixth O site, O is bonded in a distorted bent 120 degrees geometry to one Rb, one Al, and one Si atom. In the twenty-seventh O site, O is bonded in a distorted bent 120 degrees geometry to one Rb, one Al, and one Si atom. In the twenty-eighth O site, O is bonded in a distorted bent 120 degrees geometry to one Rb, one Al, and one Si atom. In the twenty-ninth O site, O is bonded in a distorted bent 120 degrees geometry to two Rb and two Al atoms. In the thirtieth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb and two Al atoms. In the thirty-first O site, O is bonded in a distorted bent 150 degrees geometry to one Rb and two Al atoms. In the thirty-second O site, O is bonded in a 4-coordinate geometry to one Rb, one Na, and two Al atoms. In the thirty-third O site, O is bonded in a distorted rectangular see-saw-like geometry to one Rb, one Na, and two Al atoms. In the thirty-fourth O site, O is bonded in a distorted bent 150 degrees geometry to two Rb and two Al atoms. In the thirty-fifth O site, O is bonded in a distorted bent 150 degrees geometry to two Rb and two Al atoms. In the thirty-sixth O site, O is bonded in a distorted bent 150 degrees geometry to three Rb and two Al atoms. In the thirty-seventh O site, O is bonded in a 2-coordinate geometry to one Rb, one Na, and two Al atoms. In the thirty-eighth O site, O is bonded in a bent 150 degrees geometry to one Rb and two Al atoms. In the thirty-ninth O site, O is bonded in a bent 150 degrees geometry to two Rb and two Al atoms. In the fortieth O site, O is bonded in a distorted bent 150 degrees geometry to one Rb, one Al, and one Si atom. In the forty-first O site, O is bonded in a 3-coordinate geometry to one Rb, one Al, and one Si atom. In the forty-second O site, O is bonded in a 2-coordinate geometry to one Rb, one Al, and one Si atom. In the forty-third O site, O is bonde

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg2Si3 by Materials Project

Mg2Si3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.80–2.94 Å. In the second Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.02 Å. In the third Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.07 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.78–2.97 Å. In the fifth Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.04 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 9-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.78–3.20 Å. In the seventh Mg2+ site, Mg2+ is bonded in a 9-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.11 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.76–2.96 Å. There are twelve inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.41–2.56 Å. In the second Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms. There are one shorter (2.52 Å) and one longer (2.54 Å) Si–Si bond lengths. In the third Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to five Mg2+ and four Si+1.33- atoms. There are one shorter (2.52 Å) and one longer (2.54 Å) Si–Si bond lengths. In the fourth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to four Mg2+ and four Si+1.33- atoms. There are one shorter (2.54 Å) and one longer (2.55 Å) Si–Si bond lengths. In the fifth Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms. There are one shorter (2.40 Å) and two longer (2.54 Å) Si–Si bond lengths. In the sixth Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to seven Mg2+ and two Si+1.33- atoms. There are one shorter (2.39 Å) and one longer (2.42 Å) Si–Si bond lengths. In the seventh Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to five Mg2+ and four Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.54–2.60 Å. In the eighth Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms. There are one shorter (2.49 Å) and one longer (2.52 Å) Si–Si bond lengths. In the ninth Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to four Mg2+ and five Si+1.33- atoms. The Si–Si bond length is 2.64 Å. In the tenth Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to five Mg2+ and five Si+1.33- atoms. In the eleventh Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms. In the twelfth Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg9Si5 by Materials Project

Mg9Si5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eighteen inequivalent Mg sites. In the first Mg site, Mg is bonded to five Si atoms to form a mixture of distorted edge and corner-sharing MgSi5 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.71–3.20 Å. In the second Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.10 Å. In the third Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.70–2.79 Å. In the fourth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.70–2.98 Å. In the fifth Mg site, Mg is bonded to four Si atoms to form a mixture of distorted edge and corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.67–2.85 Å. In the sixth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–2.95 Å. In the seventh Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.15 Å. In the eighth Mg site, Mg is bonded in a distorted T-shaped geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–2.92 Å. In the ninth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–2.93 Å. In the tenth Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.12 Å. In the eleventh Mg site, Mg is bonded in a 3-coordinate geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–2.95 Å. In the twelfth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–2.99 Å. In the thirteenth Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–3.17 Å. In the fourteenth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–2.91 Å. In the fifteenth Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.07 Å. In the sixteenth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–2.99 Å. In the seventeenth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.62–2.81 Å. In the eighteenth Mg site, Mg is bonded to four Si atoms to form a mixture of distorted edge and corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.69–2.95 Å. There are ten inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the second Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. The Si–Si bond length is 2.52 Å. In the third Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. The Si–Si bond length is 2.50 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. The Si–Si bond length is 2.56 Å. In the fifth Si site, Si is bonded in a 7-coordinate geometry to six Mg and one Si atom. The Si–Si bond length is 2.47 Å. In the sixth Si site, Si is bonded in a 8-coordinate geometry to eight Mg atoms. In the seventh Si site, Si is bonded in a 10-coordinate geometry to eight Mg and two Si atoms. In the eighth Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. In the ninth Si site, Si is bonded in a 7-coordinate geometry to seven Mg atoms. In the tenth Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg5Si6 by Materials Project

Mg5Si6 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are ten inequivalent Mg sites. In the first Mg site, Mg is bonded in a distorted T-shaped geometry to three Si atoms. There are two shorter (2.72 Å) and one longer (2.97 Å) Mg–Si bond lengths. In the second Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.59–2.94 Å. In the third Mg site, Mg is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–2.94 Å. In the fourth Mg site, Mg is bonded in a 7-coordinate geometry to nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.21 Å. In the fifth Mg site, Mg is bonded in a 4-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–3.16 Å. In the sixth Mg site, Mg is bonded in a 5-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.82–3.16 Å. In the seventh Mg site, Mg is bonded in a 7-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.86–3.06 Å. In the eighth Mg site, Mg is bonded in a 12-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.92–3.15 Å. In the ninth Mg site, Mg is bonded in a 8-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.79–2.97 Å. In the tenth Mg site, Mg is bonded in a 8-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.00 Å. There are twelve inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.37 Å) and one longer (2.40 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. The Si–Si bond length is 2.41 Å. In the third Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.38–2.42 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two equivalent Si atoms. In the fifth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.49–2.51 Å. In the sixth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.44–2.60 Å. In the seventh Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.45–2.47 Å. In the eighth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. There are two shorter (2.37 Å) and one longer (2.79 Å) Si–Si bond lengths. In the ninth Si site, Si is bonded in a 6-coordinate geometry to two equivalent Mg and four Si atoms. In the tenth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. In the eleventh Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. In the twelfth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg6Si5 by Materials Project

Mg6Si5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twelve inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a distorted trigonal non-coplanar geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.76–2.97 Å. In the second Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.14 Å. In the third Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.71–2.98 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 7-coordinate geometry to seven Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.12 Å. In the fifth Mg2+ site, Mg2+ is bonded to five Si+2.40- atoms to form distorted corner-sharing MgSi5 trigonal bipyramids. There are a spread of Mg–Si bond distances ranging from 2.79–3.10 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 3-coordinate geometry to four Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.20 Å. In the seventh Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.86–3.04 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.01 Å. In the ninth Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to five Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.74–3.23 Å. In the tenth Mg2+ site, Mg2+ is bonded in a distorted water-like geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.13 Å. In the eleventh Mg2+ site, Mg2+ is bonded in a distorted T-shaped geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.86–2.88 Å. In the twelfth Mg2+ site, Mg2+ is bonded in a 3-coordinate geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.73–3.05 Å. There are ten inequivalent Si+2.40- sites. In the first Si+2.40- site, Si+2.40- is bonded in a 7-coordinate geometry to five Mg2+ and two Si+2.40- atoms. Both Si–Si bond lengths are 2.41 Å. In the second Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to five Mg2+ and three Si+2.40- atoms. There are one shorter (2.47 Å) and one longer (2.49 Å) Si–Si bond lengths. In the third Si+2.40- site, Si+2.40- is bonded in a 7-coordinate geometry to five Mg2+ and two Si+2.40- atoms. There are one shorter (2.46 Å) and one longer (2.57 Å) Si–Si bond lengths. In the fourth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to seven Mg2+ and two Si+2.40- atoms. Both Si–Si bond lengths are 2.45 Å. In the fifth Si+2.40- site, Si+2.40- is bonded in a 7-coordinate geometry to five Mg2+ and two Si+2.40- atoms. The Si–Si bond length is 2.48 Å. In the sixth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+2.40- atoms. The Si–Si bond length is 2.47 Å. In the seventh Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+2.40- atoms. The Si–Si bond length is 2.42 Å. In the eighth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to six Mg2+ and two Si+2.40- atoms. The Si–Si bond length is 2.52 Å. In the ninth Si+2.40- site, Si+2.40- is bonded in a 1-coordinate geometry to four Mg2+ and three Si+2.40- atoms. In the tenth Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to five Mg2+ and three Si+2.40- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg6Si5 by Materials Project

Mg6Si5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twelve inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to four Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.88–2.99 Å. In the second Mg2+ site, Mg2+ is bonded in a 7-coordinate geometry to seven Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.74–3.17 Å. In the third Mg2+ site, Mg2+ is bonded in a 7-coordinate geometry to seven Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.05 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.15 Å. In the fifth Mg2+ site, Mg2+ is bonded in a 7-coordinate geometry to seven Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.74–2.93 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 3-coordinate geometry to four Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.21 Å. In the seventh Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.05 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.74–3.01 Å. In the ninth Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.01 Å. In the tenth Mg2+ site, Mg2+ is bonded in a 3-coordinate geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.73–3.07 Å. In the eleventh Mg2+ site, Mg2+ is bonded in a linear geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.28 Å. In the twelfth Mg2+ site, Mg2+ is bonded in a distorted trigonal planar geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.84–2.96 Å. There are ten inequivalent Si+2.40- sites. In the first Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to five Mg2+ and four Si+2.40- atoms. There are a spread of Si–Si bond distances ranging from 2.59–2.76 Å. In the second Si+2.40- site, Si+2.40- is bonded in a 10-coordinate geometry to seven Mg2+ and three Si+2.40- atoms. There are a spread of Si–Si bond distances ranging from 2.47–2.73 Å. In the third Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to seven Mg2+ and one Si+2.40- atom. The Si–Si bond length is 2.65 Å. In the fourth Si+2.40- site, Si+2.40- is bonded in a 11-coordinate geometry to eight Mg2+ and three Si+2.40- atoms. There are one shorter (2.74 Å) and one longer (2.87 Å) Si–Si bond lengths. In the fifth Si+2.40- site, Si+2.40- is bonded in a 10-coordinate geometry to seven Mg2+ and three Si+2.40- atoms. The Si–Si bond length is 2.52 Å. In the sixth Si+2.40- site, Si+2.40- is bonded in a 10-coordinate geometry to six Mg2+ and four Si+2.40- atoms. There are one shorter (2.69 Å) and one longer (2.87 Å) Si–Si bond lengths. In the seventh Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+2.40- atoms. The Si–Si bond length is 2.62 Å. In the eighth Si+2.40- site, Si+2.40- is bonded in a 10-coordinate geometry to seven Mg2+ and three Si+2.40- atoms. The Si–Si bond length is 2.43 Å. In the ninth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+2.40- atoms. In the tenth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+2.40- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg9Si5 by Materials Project

Mg9Si5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eighteen inequivalent Mg sites. In the first Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.03 Å. In the second Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.06 Å. In the third Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.11 Å. In the fourth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–2.90 Å. In the fifth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–3.00 Å. In the sixth Mg site, Mg is bonded in a distorted tetrahedral geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–2.80 Å. In the seventh Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.84–3.06 Å. In the eighth Mg site, Mg is bonded to four Si atoms to form a mixture of distorted edge and corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.69–2.81 Å. In the ninth Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.65–3.20 Å. In the tenth Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.65–3.21 Å. In the eleventh Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.66–2.94 Å. In the twelfth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.90 Å. In the thirteenth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–2.95 Å. In the fourteenth Mg site, Mg is bonded to four Si atoms to form a mixture of distorted edge and corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.73–2.81 Å. In the fifteenth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.83–3.05 Å. In the sixteenth Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.09 Å. In the seventeenth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.81 Å. In the eighteenth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.04 Å. There are ten inequivalent Si sites. In the first Si site, Si is bonded in a 10-coordinate geometry to nine Mg and one Si atom. The Si–Si bond length is 2.84 Å. In the second Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. The Si–Si bond length is 2.61 Å. In the third Si site, Si is bonded in a 10-coordinate geometry to nine Mg and one Si atom. The Si–Si bond length is 2.84 Å. In the fourth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. In the fifth Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. The Si–Si bond length is 2.76 Å. In the sixth Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the seventh Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the eighth Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the ninth Si site, Si is bonded in a 9-coordinate geometry to nine Mg atoms. In the tenth Si site, Si is bonded in a 4-coordinate geometry to four Mg and two Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg2Si3 by Materials Project

Mg2Si3 is Magnesium tetraboride-like structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a 7-coordinate geometry to seven Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.16 Å. In the second Mg2+ site, Mg2+ is bonded in a 1-coordinate geometry to six Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.09 Å. In the third Mg2+ site, Mg2+ is bonded in a 9-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.82–3.14 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.23 Å. In the fifth Mg2+ site, Mg2+ is bonded in a 1-coordinate geometry to six Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.09 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 7-coordinate geometry to seven Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.16 Å. In the seventh Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.23 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.82–3.14 Å. There are twelve inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 1-coordinate geometry to five Mg2+ and four Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.52–2.68 Å. In the second Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to five Mg2+ and four Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.48–2.56 Å. In the third Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to four Mg2+ and four Si+1.33- atoms. The Si–Si bond length is 2.43 Å. In the fourth Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to six Mg2+ and four Si+1.33- atoms. The Si–Si bond length is 2.46 Å. In the fifth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to five Mg2+ and three Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.46–2.54 Å. In the sixth Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.43–2.55 Å. In the seventh Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to six Mg2+ and four Si+1.33- atoms. There are two shorter (2.56 Å) and one longer (2.67 Å) Si–Si bond lengths. In the eighth Si+1.33- site, Si+1.33- is bonded in a 1-coordinate geometry to five Mg2+ and four Si+1.33- atoms. There are one shorter (2.52 Å) and one longer (2.57 Å) Si–Si bond lengths. In the ninth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to five Mg2+ and four Si+1.33- atoms. The Si–Si bond length is 2.48 Å. In the tenth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to four Mg2+ and four Si+1.33- atoms. In the eleventh Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms. In the twelfth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to five Mg2+ and three Si+1.33- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg2Si3 by Materials Project

Mg2Si3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a 9-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.89–3.22 Å. In the second Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.95–3.22 Å. In the third Mg2+ site, Mg2+ is bonded in a 9-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.11 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 10-coordinate geometry to ten Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.14 Å. In the fifth Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.75–2.99 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 9-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.83–3.22 Å. In the seventh Mg2+ site, Mg2+ is bonded in a 10-coordinate geometry to ten Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.19 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 11-coordinate geometry to eleven Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.74–3.16 Å. There are twelve inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 11-coordinate geometry to five Mg2+ and six Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.52–2.92 Å. In the second Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to six Mg2+ and four Si+1.33- atoms. There are one shorter (2.42 Å) and two longer (2.56 Å) Si–Si bond lengths. In the third Si+1.33- site, Si+1.33- is bonded in a 11-coordinate geometry to seven Mg2+ and four Si+1.33- atoms. There are one shorter (2.45 Å) and one longer (2.64 Å) Si–Si bond lengths. In the fourth Si+1.33- site, Si+1.33- is bonded in a 11-coordinate geometry to five Mg2+ and six Si+1.33- atoms. The Si–Si bond length is 2.51 Å. In the fifth Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.46–2.50 Å. In the sixth Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to seven Mg2+ and three Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.51–2.54 Å. In the seventh Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to four Mg2+ and four Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.55–2.62 Å. In the eighth Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to six Mg2+ and four Si+1.33- atoms. There are one shorter (2.55 Å) and one longer (2.61 Å) Si–Si bond lengths. In the ninth Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to five Mg2+ and four Si+1.33- atoms. The Si–Si bond length is 2.91 Å. In the tenth Si+1.33- site, Si+1.33- is bonded in a 11-coordinate geometry to seven Mg2+ and four Si+1.33- atoms. In the eleventh Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to seven Mg2+ and three Si+1.33- atoms. In the twelfth Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to seven Mg2+ and three Si+1.33- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2Ca29ZrSi16(O7F2)8 by Materials Project

Na2Ca29ZrSi16(O7F2)8 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded in a 6-coordinate geometry to three O and three F atoms. There are a spread of Na–O bond distances ranging from 2.35–2.55 Å. There are a spread of Na–F bond distances ranging from 2.28–2.57 Å. In the second Na site, Na is bonded in a 8-coordinate geometry to five O and three F atoms. There are a spread of Na–O bond distances ranging from 2.42–2.81 Å. There are a spread of Na–F bond distances ranging from 2.39–2.64 Å. There are twenty-nine inequivalent Ca sites. In the first Ca site, Ca is bonded in a 6-coordinate geometry to five O and one F atom. There are a spread of Ca–O bond distances ranging from 2.33–2.66 Å. The Ca–F bond length is 2.44 Å. In the second Ca site, Ca is bonded in a 6-coordinate geometry to five O and one F atom. There are a spread of Ca–O bond distances ranging from 2.27–2.68 Å. The Ca–F bond length is 2.30 Å. In the third Ca site, Ca is bonded in a 4-coordinate geometry to four O and one F atom. There are a spread of Ca–O bond distances ranging from 2.25–2.74 Å. The Ca–F bond length is 2.27 Å. In the fourth Ca site, Ca is bonded in a 5-coordinate geometry to two O and three F atoms. There are one shorter (2.35 Å) and one longer (2.66 Å) Ca–O bond lengths. There are a spread of Ca–F bond distances ranging from 2.16–2.37 Å. In the fifth Ca site, Ca is bonded in a 7-coordinate geometry to four O and three F atoms. There are a spread of Ca–O bond distances ranging from 2.42–2.53 Å. There are a spread of Ca–F bond distances ranging from 2.37–2.61 Å. In the sixth Ca site, Ca is bonded in a 5-coordinate geometry to two O and three F atoms. There are one shorter (2.32 Å) and one longer (2.39 Å) Ca–O bond lengths. There are a spread of Ca–F bond distances ranging from 2.23–2.27 Å. In the seventh Ca site, Ca is bonded in a 8-coordinate geometry to one Si, six O, and one F atom. The Ca–Si bond length is 2.98 Å. There are a spread of Ca–O bond distances ranging from 2.39–3.10 Å. The Ca–F bond length is 2.85 Å. In the eighth Ca site, Ca is bonded in a 6-coordinate geometry to five O and one F atom. There are a spread of Ca–O bond distances ranging from 2.31–2.62 Å. The Ca–F bond length is 2.45 Å. In the ninth Ca site, Ca is bonded in a 4-coordinate geometry to four O and one F atom. There are a spread of Ca–O bond distances ranging from 2.31–2.84 Å. The Ca–F bond length is 2.22 Å. In the tenth Ca site, Ca is bonded in a 7-coordinate geometry to five O and two F atoms. There are a spread of Ca–O bond distances ranging from 2.25–2.97 Å. There are one shorter (2.40 Å) and one longer (2.67 Å) Ca–F bond lengths. In the eleventh Ca site, Ca is bonded in a 6-coordinate geometry to five O and one F atom. There are a spread of Ca–O bond distances ranging from 2.36–2.63 Å. The Ca–F bond length is 2.31 Å. In the twelfth Ca site, Ca is bonded in a 6-coordinate geometry to five O and one F atom. There are a spread of Ca–O bond distances ranging from 2.34–2.56 Å. The Ca–F bond length is 2.30 Å. In the thirteenth Ca site, Ca is bonded in a 5-coordinate geometry to four O and two F atoms. There are a spread of Ca–O bond distances ranging from 2.21–2.66 Å. There are one shorter (2.29 Å) and one longer (2.44 Å) Ca–F bond lengths. In the fourteenth Ca site, Ca is bonded in a 6-coordinate geometry to three O and three F atoms. There are two shorter (2.35 Å) and one longer (2.50 Å) Ca–O bond lengths. There are a spread of Ca–F bond distances ranging from 2.25–2.84 Å. In the fifteenth Ca site, Ca is bonded in a 5-coordinate geometry to two O and three F atoms. There are one shorter (2.21 Å) and one longer (2.34 Å) Ca–O bond lengths. There are a spread of Ca–F bond distances ranging from 2.13–2.28 Å. In the sixteenth Ca site, Ca is bonded in a 7-coordinate geometry to one Si, four O, and two F atoms. The Ca–Si bond length is 2.87 Å. There are a spread of Ca–O bond distances ranging from 2.25–2.71 Å. There are one shorter (2.29 Å) and one longer (2.37 Å) Ca–F bond lengths. In the seventeenth Ca site, Ca is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Ca–O bond distances ranging from 2.36–2.71 Å. The Ca–F bond length is 2.63 Å. In the eighteenth Ca site, Ca is bonded in a 6-coordinate geometry to five O and one F atom. There are a spread of Ca–O bond distances ranging from 2.31–2.85 Å. The Ca–F bond length is 2.17 Å. In the nineteenth Ca site, Ca is bonded to three O and three F atoms to form distorted CaO3F3 pentagonal pyramids that share corners with two SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.27–2.53 Å. There are a spread of Ca–F bond distances ranging from 2.24–2.52 Å. In the twentieth Ca site, Ca is bonded in a 5-coordinate geometry to three O and two F atoms. There are a spread of Ca–O bond distances ranging from 2.30–2.49 Å. There are one shorter (2.39 Å) and one longer (2.40 Å) Ca–F bond lengths. In the twenty-first Ca site, Ca is bonded in a 5-coordinate geometry to four O and one F atom. There are a spread of Ca–O bond distances ranging from 2.34–2.47 Å. The Ca–F bond length is 2.44 Å. In the twenty-second Ca site, Ca is bonded in a 5-coordinate geometry to four O and one F atom. There are a spread of Ca–O bond distances ranging from 2.20–2.51 Å. The Ca–F bond length is 2.38 Å. In the twenty-third Ca site, Ca is bonded in a 7-coordinate geometry to one Si, five O, and one F atom. The Ca–Si bond length is 2.86 Å. There are a spread of Ca–O bond distances ranging from 2.34–2.79 Å. The Ca–F bond length is 2.75 Å. In the twenty-fourth Ca site, Ca is bonded in a 4-coordinate geometry to three O and two F atoms. There are a spread of Ca–O bond distances ranging from 2.31–3.11 Å. There are one shorter (2.21 Å) and one longer (2.35 Å) Ca–F bond lengths. In the twenty-fifth Ca site, Ca is bonded in a 5-coordinate geometry to four O and one F atom. There are a spread of Ca–O bond distances ranging from 2.30–2.58 Å. The Ca–F bond length is 2.22 Å. In the twenty-sixth Ca site, Ca is bonded in a 5-coordinate geometry to two O and three F atoms. There are one shorter (2.36 Å) and one longer (2.52 Å) Ca–O bond lengths. There are a spread of Ca–F bond distances ranging from 2.27–2.30 Å. In the twenty-seventh Ca site, Ca is bonded in a 6-coordinate geometry to three O and three F atoms. There are a spread of Ca–O bond distances ranging from 2.25–2.61 Å. There are a spread of Ca–F bond distances ranging from 2.25–2.60 Å. In the twenty-eighth Ca site, Ca is bonded in a 6-coordinate geometry to five O and one F atom. There are a spread of Ca–O bond distances ranging from 2.41–2.72 Å. The Ca–F bond length is 2.26 Å. In the twenty-ninth Ca site, Ca is bonded in a 7-coordinate geometry to six O and one F atom. There are a spread of Ca–O bond distances ranging from 2.31–3.03 Å. The Ca–F bond length is 2.42 Å. Zr is bonded to six O and one F atom to form distorted ZrO6F pentagonal bipyramids that share corners with two SiO4 tetrahedra and an edgeedge with one SiO4 tetrahedra. There are a spread of Zr–O bond distances ranging from 2.07–2.26 Å. The Zr–F bond length is 2.18 Å. There are sixteen inequivalent Si sites. In the first Si site, Si is bonded in a tetrahedral geometry to four O atoms. There are a spread of Si–O bond distances ranging from 1.62–1.67 Å. In the second Si site, Si is bonded in a distorted trigonal non-coplanar geometry to one Ca and three O atoms. There are a spread of Si–O bond distances ranging from 1.64–1.80 Å. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share an edgeedge with one ZrO6F pentagonal bipyramid. There are a spread of Si–O bond distances ranging from 1.62–1.67 Å. In the fourth Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.63–1.74 Å. In the fifth Si site, Si is bonded in a tetrahedral geometry to four O atoms. There are a spread of Si–O bond distances ranging from 1.62–1.69 Å. In the sixth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one ZrO6F pentagonal bipyramid, a cornercorner with one CaO3F3 pentagonal pyramid, and a cornercorner with one SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.75 Å. In the seventh Si site, Si is bonded in a distorted trigonal non-coplanar geometry to one Ca and three O atoms. There are a spread of Si–O bond distances ranging from 1.65–1.75 Å. In the eighth Si site, Si is bonded in a tetrahedral geometry to four O atoms. There are a spread of Si–O bond distances ranging from 1.61–1.71 Å. In the ninth Si site, Si is bonded in a tetrahedral geometry to four O atoms. There are a spread of Si–O bond distances ranging from 1.61–1.71 Å. In the tenth Si site, Si is bonded in a distorted trigonal non-coplanar geometry to three O atoms. There are a spread of Si–O bond distances ranging from 1.64–1.78 Å. In the eleventh Si site, Si is bonded in a distorted trigonal non-coplanar geometry to three O atoms. There are a spread of Si–O bond distances ranging from 1.64–1.83 Å. In the twelfth Si site, Si is bonded to four O atoms to form corner-sharing SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.63–1.71 Å. In the thirteenth Si site, Si is bonded in a 3-coordinate geometry to two O and one F atom. There is one shorter (1.64 Å) and one longer (1.69 Å) Si–O bond length. The Si–F bond length is 1.88 Å. In the fourteenth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one ZrO6F pentagonal bipyramid, a cornercorner with one CaO3F3 pentagonal pyramid, and a cornercorner with one SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.70 Å. In the fifteenth Si site, Si is bonded in a distorted trigonal non-coplanar geometry to one Ca and three O atoms. There are a spread of Si–O bond distances ranging from 1.64–1.80 Å. In the sixteenth Si site, Si is bonded in a tetrahedral geometry to four O atoms. There are a spread of Si–O bond distances ranging from 1.60–1.70 Å. There are fifty-six inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to two Ca and one Si atom. In the second O site, O is bonded in a 3-coordinate geometry to two Ca and one Si atom. In the third O site, O is bonded in a 5-coordinate geometry to four Ca and one O atom. The O–O bond length is 1.52 Å. In the fourth O site, O is bonded in a 1-coordinate geometry to three Ca and one Si atom. In the fifth O site, O is bonded in a 1-coordinate geometry to one Ca, one Si, and one O atom. In the sixth O site, O is bonded in a 1-coordinate geometry to two Ca and one Si atom. In the seventh O site, O is bonded to one Na, two Ca, and one Si atom to form distorted ONaCa2Si trigonal pyramids that share a cornercorner with one OCa3O tetrahedra, a cornercorner with one FCa4 tetrahedra, an edgeedge with one ONaCaZrSi tetrahedra, and edges with two FNaCa3 tetrahedra. In the eighth O site, O is bonded to three Ca and one Si atom to form distorted OCa3Si tetrahedra that share corners with three FNaCa3 tetrahedra and an edgeedge with one OCa3Si tetrahedra. In the ninth O site, O is bonded in a 1-coordinate geometry to three Ca and one Si atom. In the tenth O site, O is bonded in a distorted trigonal planar geometry to three Ca and one Si atom. In the eleventh O site, O is bonded in a 4-coordinate geometry to three Ca and one Si atom. In the twelfth O site, O is bonded in a 1-coordinate geometry to three Ca and one Si atom. In the thirteenth O site, O is bonded in a distorted bent 150 degrees geometry to two Ca and two Si atoms. In the fourteenth O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the fifteenth O site, O is bonded in a 3-coordinate geometry to one Ca and two Si atoms. In the sixteenth O

36 MATERIALS SCIENCE↗