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DOE OSTI2020

Materials Data on MgSi by Materials Project

MgSi crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are three inequivalent Mg sites. In the first Mg site, Mg is bonded in a 6-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.14 Å. In the second 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 2.74–2.95 Å. In the third 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 2.80–3.10 Å. There are three inequivalent Si sites. In the first Si site, Si is bonded in a 10-coordinate geometry to seven Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.49–2.92 Å. In the second Si site, Si is bonded in a 10-coordinate geometry to seven Mg and three Si atoms. There are one shorter (2.56 Å) and one longer (2.77 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 1-coordinate geometry to seven Mg and four Si atoms. The Si–Si bond length is 2.62 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg5Si9 by Materials Project

Mg5Si9 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 6-coordinate geometry to one Mg and six Si atoms. The Mg–Mg bond length is 3.08 Å. There are a spread of Mg–Si bond distances ranging from 2.74–3.10 Å. In the second Mg site, Mg is bonded in a 6-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–3.22 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 2.80–3.22 Å. In the fourth Mg site, Mg is bonded in a 7-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.23 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 2.73–3.21 Å. In the sixth Mg site, Mg is bonded in a 1-coordinate geometry to nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.65–3.14 Å. In the seventh Mg site, Mg is bonded in a 8-coordinate geometry to one Mg and eight Si atoms. The Mg–Mg bond length is 3.48 Å. There are a spread of Mg–Si bond distances ranging from 2.79–3.06 Å. In the eighth Mg site, Mg is bonded in a 6-coordinate geometry to three Mg and eleven Si atoms. The Mg–Mg bond length is 3.27 Å. There are a spread of Mg–Si bond distances ranging from 2.88–3.27 Å. In the ninth Mg site, Mg is bonded in a 11-coordinate geometry to one Mg and eleven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.15 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 2.71–3.14 Å. There are eighteen inequivalent Si sites. In the first Si site, Si is bonded in a 1-coordinate geometry to five Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.54–2.79 Å. In the second Si site, Si is bonded in a 8-coordinate geometry to three Mg and five Si atoms. There are a spread of Si–Si bond distances ranging from 2.48–2.73 Å. In the third 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 2.57–2.76 Å. In the fourth 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 2.45–2.77 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to four Mg and five Si atoms. There are a spread of Si–Si bond distances ranging from 2.47–2.80 Å. In the sixth Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.39–2.43 Å. In the seventh Si site, Si is bonded in a 6-coordinate geometry to four Mg and five Si atoms. There are a spread of Si–Si bond distances ranging from 2.45–2.75 Å. In the eighth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. There are one shorter (2.58 Å) and one longer (2.60 Å) Si–Si bond lengths. In the ninth Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. There are one shorter (2.46 Å) and one longer (2.50 Å) Si–Si bond lengths. In the tenth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. In the eleventh Si site, Si is bonded in a 1-coordinate geometry to five Mg and four Si atoms. The Si–Si bond length is 2.52 Å. In the twelfth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. In the thirteenth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. There are one shorter (2.51 Å) and one longer (2.90 Å) Si–Si bond lengths. In the fourteenth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. The Si–Si bond length is 2.51 Å. In the fifteenth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. In the sixteenth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. In the seventeenth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. In the eighteenth Si site, Si is bonded in a 10-coordinate geometry to five Mg and five Si atoms.

36 MATERIALS SCIENCE↗
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 six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.84–3.13 Å. In the second Mg site, Mg is bonded in a 6-coordinate geometry to two equivalent Mg and six Si atoms. There are one shorter (3.11 Å) and one longer (3.18 Å) Mg–Mg bond lengths. There are a spread of Mg–Si bond distances ranging from 2.77–2.90 Å. In the third Mg site, Mg is bonded in a 4-coordinate geometry to one Mg and six Si atoms. The Mg–Mg bond length is 3.32 Å. There are a spread of Mg–Si bond distances ranging from 2.81–3.25 Å. In the fourth Mg site, Mg is bonded in a 7-coordinate geometry to six Mg and seven Si atoms. There are a spread of Mg–Mg bond distances ranging from 2.90–3.06 Å. There are a spread of Mg–Si bond distances ranging from 2.84–3.08 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 2.88–2.99 Å. In the sixth 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 2.68–2.90 Å. In the seventh Mg site, Mg is bonded in a 7-coordinate geometry to one Mg and seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.67–2.96 Å. In the eighth Mg site, Mg is bonded in a 6-coordinate geometry to two equivalent Mg and six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.00 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 2.78–3.02 Å. In the tenth Mg site, Mg is bonded in a 12-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.08 Å. There are twelve inequivalent Si sites. In the first 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 2.44–2.55 Å. In the second Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. There are one shorter (2.47 Å) and one longer (2.69 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 3-coordinate geometry to seven Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.53–2.85 Å. In the fourth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. There are one shorter (2.42 Å) and one longer (2.58 Å) Si–Si bond lengths. In the fifth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. There are one shorter (2.47 Å) and one longer (2.49 Å) Si–Si bond lengths. In the sixth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. There are one shorter (2.40 Å) and one longer (2.48 Å) Si–Si bond lengths. In the seventh Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. There are one shorter (2.47 Å) and one longer (2.48 Å) Si–Si bond lengths. In the eighth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. The Si–Si bond length is 2.47 Å. In the ninth Si site, Si is bonded in a 9-coordinate geometry to four Mg and three Si atoms. The Si–Si bond length is 2.50 Å. In the tenth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. In the eleventh Si site, Si is bonded in a 7-coordinate geometry to four Mg and three 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 Mg7Si4 by Materials Project

Mg7Si4 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are fourteen 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 2.77–2.85 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 2.88–3.08 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 2.74–2.98 Å. In the fourth 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 2.76–3.01 Å. In the fifth Mg site, Mg is bonded in a 2-coordinate geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.89 Å. In the sixth Mg site, Mg is bonded in a 2-coordinate geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–2.97 Å. In the seventh Mg site, Mg is bonded in a 2-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.67–2.97 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 2.78–2.87 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 2.69–3.08 Å. In the tenth 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 2.70–2.91 Å. In the eleventh Mg site, Mg is bonded in a 2-coordinate geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–3.13 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 2.73–2.82 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 2.81–2.89 Å. In the fourteenth Mg site, Mg is bonded in a distorted trigonal non-coplanar geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.83 Å. There are eight inequivalent Si sites. In the first Si site, Si is bonded in a 3-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.41 Å) and one longer (2.54 Å) Si–Si bond lengths. 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 2.44 Å. In the third Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. In the fourth Si site, Si is bonded in a 9-coordinate geometry to four Mg and two Si atoms. There are one shorter (2.45 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 seven Mg and two Si atoms. In the sixth Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. The Si–Si bond length is 2.46 Å. In the seventh Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. In the eighth Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms.

36 MATERIALS SCIENCE↗
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 distorted rectangular see-saw-like geometry to two equivalent Mg and four Si atoms. There are one shorter (3.08 Å) and one longer (3.12 Å) Mg–Mg bond lengths. There are a spread of Mg–Si bond distances ranging from 2.65–2.86 Å. In the second 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 2.72–2.90 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 2.73–2.97 Å. In the fourth Mg site, Mg is bonded in a 3-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.20 Å. In the fifth Mg site, Mg is bonded in a 11-coordinate geometry to two equivalent Mg and nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.21 Å. In the sixth 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 2.81–3.13 Å. In the seventh 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 2.80–2.93 Å. In the eighth 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 2.81–3.11 Å. In the ninth 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 2.79–2.96 Å. In the tenth 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 2.74–3.21 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 (2.38 Å) and one longer (2.47 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 8-coordinate geometry to three Mg and six Si atoms. There are a spread of Si–Si bond distances ranging from 2.48–2.96 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 2.43–2.59 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.42 Å) and one longer (2.73 Å) Si–Si bond lengths. In the fifth 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 (2.62 Å) Si–Si bond lengths. In the sixth Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. There are one shorter (2.49 Å) and one longer (2.59 Å) Si–Si bond lengths. In the seventh Si site, Si is bonded in a 9-coordinate geometry to three Mg and six Si atoms. There are one shorter (2.59 Å) and one longer (2.69 Å) Si–Si bond lengths. In the eighth Si site, Si is bonded in a 10-coordinate geometry to eight Mg and two Si atoms. The Si–Si bond length is 2.53 Å. In the ninth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. In the tenth Si site, Si is bonded in a 9-coordinate geometry to two Mg and seven Si atoms. There are one shorter (2.75 Å) and one longer (2.88 Å) Si–Si bond lengths. 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 5-coordinate geometry to five Mg and two Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg3Si4 by Materials Project

Mg3Si4 is Magnesium tetraboride-like structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are six inequivalent Mg sites. In the first Mg site, Mg is bonded in a 6-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.16 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 2.71–3.11 Å. In the third Mg site, Mg is bonded in a 7-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.21 Å. In the fourth 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 2.76–3.04 Å. In the fifth Mg site, Mg is bonded in a 5-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.21 Å. In the sixth 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 2.67–3.16 Å. There are eight inequivalent Si sites. In the first Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.41–2.60 Å. In the second 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 2.48–2.58 Å. In the third Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.47 Å) and one longer (2.60 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. In the fifth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. In the sixth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. There are one shorter (2.48 Å) and one longer (2.51 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. In the eighth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg7Si4 by Materials Project

Mg7Si4 crystallizes in the triclinic P1 space group. The structure is two-dimensional and consists of one Mg7Si4 sheet oriented in the (0, 0, 1) direction. there are fourteen inequivalent Mg sites. In the first Mg site, Mg is bonded in a distorted trigonal non-coplanar geometry to two Mg and three Si atoms. There are one shorter (3.02 Å) and one longer (3.19 Å) Mg–Mg bond lengths. There are one shorter (2.75 Å) and two longer (2.82 Å) Mg–Si bond lengths. In the second Mg site, Mg is bonded to four Mg and four Si atoms to form distorted MgMg4Si4 tetrahedra that share corners with two equivalent MgSi4 trigonal pyramids, an edgeedge with one MgSi4 trigonal pyramid, and faces with two equivalent MgMg4Si4 tetrahedra. There are a spread of Mg–Mg bond distances ranging from 3.09–3.26 Å. There are a spread of Mg–Si bond distances ranging from 2.68–2.84 Å. In the third Mg site, Mg is bonded in a 4-coordinate geometry to seven Mg and six Si atoms. There are a spread of Mg–Mg bond distances ranging from 3.00–3.24 Å. There are a spread of Mg–Si bond distances ranging from 2.92–3.17 Å. In the fourth Mg site, Mg is bonded in a 5-coordinate geometry to six Mg and seven Si atoms. The Mg–Mg bond length is 3.35 Å. There are a spread of Mg–Si bond distances ranging from 2.92–3.13 Å. In the fifth 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 2.78–3.18 Å. In the sixth Mg site, Mg is bonded in a 2-coordinate geometry to two Si atoms. There are one shorter (2.79 Å) and one longer (2.88 Å) Mg–Si bond lengths. In the seventh 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 2.88–3.08 Å. In the eighth Mg site, Mg is bonded in a distorted L-shaped geometry to two Si atoms. There are one shorter (2.74 Å) and one longer (2.80 Å) Mg–Si bond lengths. 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 2.78–3.10 Å. In the tenth Mg site, Mg is bonded to four Si atoms to form distorted MgSi4 trigonal pyramids that share corners with two equivalent MgMg4Si4 tetrahedra, corners with two equivalent MgSi4 trigonal pyramids, and an edgeedge with one MgMg4Si4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.67–3.00 Å. In the eleventh 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 2.87–3.09 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 2.77–2.85 Å. In the thirteenth Mg site, Mg is bonded in a distorted water-like geometry to one Mg and two equivalent Si atoms. There are one shorter (2.80 Å) and one longer (2.82 Å) Mg–Si bond lengths. In the fourteenth Mg site, Mg is bonded in a distorted water-like geometry to two Mg and two equivalent Si atoms. There are one shorter (2.74 Å) and one longer (2.78 Å) Mg–Si bond lengths. There are eight 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 (2.45 Å) and one longer (2.47 Å) Si–Si bond lengths. 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 2.48 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 8-coordinate geometry to six Mg and two Si atoms. Both Si–Si bond lengths are 2.46 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si 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 2.42 Å. In the seventh Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. In the eighth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg5Si6 by Materials Project

Mg5Si6 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are three inequivalent Mg sites. In the first Mg site, Mg is bonded in a square co-planar geometry to four Si atoms. There are two shorter (2.70 Å) and two longer (2.78 Å) Mg–Si bond lengths. 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 2.82–3.10 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 2.85–3.05 Å. There are three 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 (2.37 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 six Mg and three equivalent Si atoms. There are two shorter (2.47 Å) and one longer (2.50 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 9-coordinate geometry to four Mg and four Si 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 7-coordinate geometry to seven Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.91 Å. In the second 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 2.71–3.10 Å. In the third 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 2.76–2.97 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.66–2.89 Å. In the fifth Mg2+ site, Mg2+ is bonded to five Si+1.33- atoms to form distorted edge-sharing MgSi5 trigonal bipyramids. There are a spread of Mg–Si bond distances ranging from 2.73–2.91 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 2.77–2.86 Å. In the seventh 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 2.76–3.09 Å. In the eighth 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 2.71–3.08 Å. There are twelve inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to three Mg2+ and three Si+1.33- atoms. There are two shorter (2.41 Å) and one longer (2.43 Å) Si–Si bond lengths. In the second Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to two Mg2+ and four Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.34–2.49 Å. In the third Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. The Si–Si bond length is 2.41 Å. In the fourth Si+1.33- site, Si+1.33- is bonded in a 5-coordinate geometry to two Mg2+ and three Si+1.33- atoms. The Si–Si bond length is 2.43 Å. In the fifth Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to six Mg2+ and one Si+1.33- atom. The Si–Si bond length is 2.42 Å. In the sixth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+1.33- atoms. There are one shorter (2.44 Å) and one longer (2.47 Å) Si–Si bond lengths. In the seventh Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to three Mg2+ and three Si+1.33- atoms. There are one shorter (2.40 Å) and two longer (2.43 Å) Si–Si bond lengths. In the eighth Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to three Mg2+ and three Si+1.33- atoms. There are one shorter (2.42 Å) and one longer (2.43 Å) Si–Si bond lengths. In the ninth Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. In the tenth Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. In the eleventh Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+1.33- atoms. In the twelfth Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to five Mg2+ and two Si+1.33- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgSi2 by Materials Project

MgSi2 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are four inequivalent Mg sites. In the first 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 2.65–2.89 Å. In the second Mg site, Mg is bonded in a 9-coordinate geometry to nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.04 Å. In the third Mg site, Mg is bonded to six Si atoms to form distorted edge-sharing MgSi6 octahedra. There are a spread of Mg–Si bond distances ranging from 2.78–3.03 Å. In the fourth 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 2.81–3.02 Å. There are eight inequivalent Si sites. In the first Si site, Si is bonded in a 8-coordinate geometry to six Mg and two equivalent Si atoms. Both Si–Si bond lengths are 2.43 Å. In the second Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. There are two shorter (2.44 Å) and one longer (2.47 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. Both Si–Si bond lengths are 2.38 Å. In the fourth Si site, Si is bonded in a 7-coordinate geometry to three Mg and three Si atoms. There are one shorter (2.40 Å) and two longer (2.43 Å) Si–Si bond lengths. In the fifth Si site, Si is bonded in a 6-coordinate geometry to three Mg and five Si atoms. There are one shorter (2.47 Å) and two longer (2.86 Å) Si–Si bond lengths. In the sixth Si site, Si is bonded to three Mg and three Si atoms to form distorted edge-sharing SiMg3Si3 octahedra. The Si–Si bond length is 2.46 Å. In the seventh Si site, Si is bonded in a 5-coordinate geometry to one Mg and four Si atoms. In the eighth Si site, Si is bonded in a 9-coordinate geometry to four Mg and five Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg6Si5 by Materials Project

Mg6Si5 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are twelve inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a single-bond geometry to one Si+2.40- atom. The Mg–Si bond length is 2.84 Å. In the second Mg2+ site, Mg2+ is bonded in a rectangular see-saw-like geometry to four Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.65–2.90 Å. In the third 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 2.83–3.09 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to eight Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.15 Å. In the fifth 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 2.87–3.04 Å. In the sixth 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 2.97–3.14 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 2.90–2.98 Å. In the eighth 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 2.76–3.03 Å. In the ninth Mg2+ site, Mg2+ is bonded in a distorted T-shaped geometry to three Si+2.40- atoms. There are two shorter (2.83 Å) and one longer (2.91 Å) Mg–Si bond lengths. In the tenth 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 2.80–3.09 Å. In the eleventh Mg2+ site, Mg2+ is bonded in a linear geometry to two Si+2.40- atoms. There are one shorter (2.72 Å) and one longer (2.83 Å) Mg–Si bond lengths. In the twelfth 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 2.91–3.11 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 seven Mg2+ and two Si+2.40- atoms. There are one shorter (2.37 Å) and one longer (2.46 Å) Si–Si bond lengths. In the second Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to seven Mg2+ and two Si+2.40- atoms. The Si–Si bond length is 2.40 Å. In the third Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+2.40- atoms. There are two shorter (2.47 Å) and one longer (2.70 Å) Si–Si bond lengths. In the fourth Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to four Mg2+ and four Si+2.40- atoms. There are a spread of Si–Si bond distances ranging from 2.37–2.63 Å. In the fifth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to seven Mg2+ and two Si+2.40- atoms. The Si–Si bond length is 2.59 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. There are one shorter (2.53 Å) and two longer (2.54 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. 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. In the ninth Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to six Mg2+ and two equivalent Si+2.40- atoms. In the tenth Si+2.40- site, Si+2.40- is bonded in a 10-coordinate geometry to six Mg2+ and four Si+2.40- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgSi by Materials Project

MgSi crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are six inequivalent Mg sites. In the first Mg site, Mg is bonded in a 11-coordinate geometry to five Mg and six Si atoms. There are a spread of Mg–Mg bond distances ranging from 2.87–3.02 Å. There are a spread of Mg–Si bond distances ranging from 2.89–3.18 Å. In the second Mg site, Mg is bonded in a 12-coordinate geometry to four Mg and eight Si atoms. There are two shorter (2.91 Å) and two longer (3.11 Å) Mg–Mg bond lengths. There are a spread of Mg–Si bond distances ranging from 2.72–3.16 Å. In the third Mg site, Mg is bonded in a 1-coordinate geometry to two equivalent Mg and eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.67–3.24 Å. In the fourth Mg site, Mg is bonded in a 7-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.17 Å. In the fifth Mg site, Mg is bonded in a 12-coordinate geometry to four Mg and seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.87–2.98 Å. In the sixth Mg site, Mg is bonded in a 12-coordinate geometry to three equivalent Mg and six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–3.06 Å. There are six inequivalent Si sites. In the first Si site, Si is bonded in a 10-coordinate geometry to eight Mg and two equivalent Si atoms. Both Si–Si bond lengths are 2.53 Å. In the second Si site, Si is bonded in a 11-coordinate geometry to seven Mg and four Si atoms. There are two shorter (2.57 Å) and two longer (2.84 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 11-coordinate geometry to nine Mg and two equivalent Si atoms. Both Si–Si bond lengths are 2.66 Å. In the fourth Si site, Si is bonded in a 11-coordinate geometry to seven Mg and four Si atoms. In the fifth 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 sixth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg2Si by Materials Project

Mg2Si crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded to five equivalent Si4- atoms to form MgSi5 trigonal bipyramids that share corners with twelve equivalent MgSi6 octahedra, corners with eight equivalent MgSi5 trigonal bipyramids, edges with six equivalent MgSi5 trigonal bipyramids, and faces with six equivalent MgSi6 octahedra. The corner-sharing octahedra tilt angles range from 27–61°. There are a spread of Mg–Si bond distances ranging from 2.66–3.12 Å. In the second Mg2+ site, Mg2+ is bonded to six equivalent Si4- atoms to form distorted MgSi6 octahedra that share corners with twelve equivalent MgSi6 octahedra, corners with twelve equivalent MgSi5 trigonal bipyramids, edges with six equivalent MgSi6 octahedra, faces with two equivalent MgSi6 octahedra, and faces with six equivalent MgSi5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 51–52°. There are a spread of Mg–Si bond distances ranging from 2.98–3.17 Å. Si4- is bonded in a 3-coordinate geometry to eleven Mg2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgSi by Materials Project

MgSi crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are three inequivalent Mg sites. In the first 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 2.76–2.99 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 2.70–2.86 Å. In the third Mg site, Mg is bonded in a 5-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–3.00 Å. There are three inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two equivalent Si atoms. There are one shorter (2.41 Å) and one longer (2.44 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two equivalent Si atoms. Both Si–Si bond lengths are 2.48 Å. In the third Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two equivalent Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg2Si by Materials Project

Mg2Si 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 distorted see-saw-like geometry to four Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.80–3.04 Å. In the second Mg2+ site, Mg2+ is bonded in a linear geometry to two Si4- atoms. There are one shorter (2.67 Å) and one longer (2.68 Å) Mg–Si bond lengths. In the third Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to four Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.65–2.93 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 3-coordinate geometry to three Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.63–2.99 Å. In the fifth Mg2+ site, Mg2+ is bonded to four Si4- atoms to form a mixture of distorted corner and edge-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.78–2.99 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.76–2.97 Å. In the seventh Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to four Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.01 Å. In the eighth Mg2+ site, Mg2+ is bonded to four Si4- atoms to form a mixture of corner and edge-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.79–2.96 Å. There are four inequivalent Si4- sites. In the first Si4- site, Si4- is bonded in a 8-coordinate geometry to seven Mg2+ and one Si4- atom. The Si–Si bond length is 2.55 Å. In the second Si4- site, Si4- is bonded in a 8-coordinate geometry to seven Mg2+ and one Si4- atom. The Si–Si bond length is 2.53 Å. In the third Si4- site, Si4- is bonded in a 9-coordinate geometry to seven Mg2+ and two Si4- atoms. In the fourth Si4- site, Si4- is bonded in a 9-coordinate geometry to nine Mg2+ 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 5-coordinate geometry to seven Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.84–3.18 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 2.73–2.97 Å. In the third Mg2+ site, Mg2+ is bonded to four Si+1.33- atoms to form distorted corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.69–2.98 Å. In the fourth 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 2.75–2.97 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 2.72–2.98 Å. In the sixth 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 2.66–3.10 Å. In the seventh 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 2.73–2.95 Å. In the eighth 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 2.74–2.96 Å. There are twelve inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 5-coordinate geometry to three Mg2+ and two Si+1.33- atoms. There are one shorter (2.33 Å) and one longer (2.42 Å) Si–Si bond lengths. In the second Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. There are one shorter (2.49 Å) and one longer (2.50 Å) Si–Si bond lengths. In the third Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to three Mg2+ and three Si+1.33- atoms. Both Si–Si bond lengths are 2.39 Å. 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 (2.56 Å) and one longer (2.58 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 a spread of Si–Si bond distances ranging from 2.51–2.60 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 2.44–2.54 Å. In the seventh Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.46–2.49 Å. In the eighth Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. There are one shorter (2.50 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 8-coordinate geometry to four Mg2+ and four Si+1.33- atoms. 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 8-coordinate geometry to five 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 MgSi by Materials Project

MgSi is Magnesium tetraboride-like structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are six inequivalent Mg sites. In the first Mg site, Mg is bonded in a 9-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.65–3.05 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 2.74–3.06 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 2.72–2.96 Å. In the fourth 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 2.72–2.87 Å. In the fifth Mg site, Mg is bonded in a 3-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.62–2.91 Å. In the sixth 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 2.67–2.94 Å. There are six inequivalent Si sites. In the first Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. There are one shorter (2.37 Å) and one longer (2.42 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. There are one shorter (2.41 Å) and one longer (2.46 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. There are one shorter (2.46 Å) and one longer (2.73 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. In the fifth Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. In the sixth 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 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 6-coordinate geometry to six Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.68–3.02 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 2.71–3.09 Å. In the third 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 2.76–3.06 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.68–3.06 Å. In the fifth 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 2.65–3.02 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.84–2.98 Å. In the seventh Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to six Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.66–3.15 Å. In the eighth Mg2+ site, Mg2+ is bonded to seven Si+1.33- atoms to form a mixture of distorted corner and edge-sharing MgSi7 pentagonal bipyramids. There are a spread of Mg–Si bond distances ranging from 2.92–3.11 Å. There are twelve inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. There are two shorter (2.40 Å) and one longer (2.51 Å) Si–Si bond lengths. In the second Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to three Mg2+ and three Si+1.33- atoms. There are one shorter (2.38 Å) and one longer (2.42 Å) Si–Si bond lengths. In the third Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to three Mg2+ and three Si+1.33- atoms. The Si–Si bond length is 2.39 Å. In the fourth Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to three Mg2+ and three Si+1.33- atoms. The Si–Si bond length is 2.40 Å. In the fifth Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to five Mg2+ and two Si+1.33- atoms. There are one shorter (2.32 Å) and one longer (2.42 Å) Si–Si bond lengths. In the sixth Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. There are one shorter (2.39 Å) and two longer (2.40 Å) Si–Si bond lengths. In the seventh Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.38–2.42 Å. In the eighth Si+1.33- site, Si+1.33- is bonded in a 2-coordinate geometry to three Mg2+ and three Si+1.33- atoms. In the ninth Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to five Mg2+ and two Si+1.33- atoms. In the tenth Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to four Mg2+ and two equivalent Si+1.33- atoms. In the eleventh Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to six Mg2+ and one Si+1.33- atom. In the twelfth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+1.33- atoms.

36 MATERIALS SCIENCE↗