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Materials Data on Mg4Si7 by Materials Project

Mg4Si7 is Magnesium tetraboride-like structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 11-coordinate geometry to one Mg and ten Si atoms. The Mg–Mg bond length is 2.88 Å. There are a spread of Mg–Si bond distances ranging from 2.67–2.94 Å. In the second Mg site, Mg is bonded to four Si atoms to form distorted corner-sharing MgSi4 trigonal pyramids. There are a spread of Mg–Si bond distances ranging from 2.64–2.92 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 2.76–2.97 Å. In the fourth Mg site, Mg is bonded in a 7-coordinate geometry to one Mg and seven Si atoms. The Mg–Mg bond length is 3.00 Å. There are a spread of Mg–Si bond distances ranging from 2.81–3.06 Å. In the fifth Mg site, Mg is bonded in a 8-coordinate geometry to one Mg and eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.63–3.03 Å. In the sixth Mg site, Mg is bonded in a 5-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.67–3.27 Å. In the seventh Mg site, Mg is bonded in a 1-coordinate geometry to one Mg and eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.10 Å. In the eighth 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 2.88–3.14 Å. There are fourteen inequivalent Si sites. In the first Si site, Si is bonded in a 2-coordinate geometry to four Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.46–2.73 Å. In the second Si site, Si is bonded in a 8-coordinate geometry to eight Si atoms. There are a spread of Si–Si bond distances ranging from 2.59–2.81 Å. In the third Si site, Si is bonded in a 2-coordinate geometry to two Mg and seven Si atoms. There are two shorter (2.69 Å) and one longer (2.93 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. There are one shorter (2.44 Å) and one longer (2.50 Å) Si–Si bond lengths. In the fifth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. There are one shorter (2.55 Å) and two longer (2.58 Å) Si–Si bond lengths. 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 2.46 Å. In the seventh Si site, Si is bonded in a 7-coordinate geometry to two Mg and seven Si atoms. There are one shorter (2.49 Å) and one longer (2.51 Å) Si–Si bond lengths. In the eighth Si site, Si is bonded in a distorted body-centered cubic geometry to three Mg and five Si atoms. There are one shorter (2.47 Å) and one longer (2.50 Å) Si–Si bond lengths. In the ninth Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. The Si–Si bond length is 2.56 Å. In the tenth Si site, Si is bonded in a 9-coordinate geometry to three Mg and six Si atoms. There are a spread of Si–Si bond distances ranging from 2.43–2.56 Å. In the eleventh Si site, Si is bonded in a 7-coordinate geometry to six Mg and one Si atom. In the twelfth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. The Si–Si bond length is 2.54 Å. In the thirteenth Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 11-coordinate geometry to eleven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.95–3.21 Å. In the second Mg site, Mg is bonded in a rectangular see-saw-like geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.65–2.79 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 2.82–3.09 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 2.86–2.99 Å. In the fifth Mg site, Mg is bonded in a 8-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.84–3.25 Å. In the sixth Mg site, Mg is bonded in a 9-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.84–3.17 Å. In the seventh 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 2.86–3.21 Å. In the eighth Mg site, Mg is bonded in a 8-coordinate geometry to nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.91–3.21 Å. There are fourteen 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 2.36–2.49 Å. In the second Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. There are one shorter (2.45 Å) and one longer (2.48 Å) Si–Si bond lengths. In the third 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 2.43–2.73 Å. In the fourth Si site, Si is bonded in a 7-coordinate geometry to two equivalent Mg and five Si atoms. There are a spread of Si–Si bond distances ranging from 2.44–2.68 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.36 Å) and one longer (2.37 Å) Si–Si bond lengths. 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 2.37 Å. In the seventh Si site, Si is bonded in a 7-coordinate geometry to two Mg and five Si atoms. The Si–Si bond length is 2.39 Å. In the eighth Si site, Si is bonded in a 10-coordinate geometry to five Mg and four Si atoms. There are one shorter (2.45 Å) and two longer (2.46 Å) Si–Si bond lengths. In the ninth 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 2.42–2.51 Å. In the tenth Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. There are one shorter (2.45 Å) and one longer (2.46 Å) Si–Si bond lengths. In the eleventh Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. The Si–Si bond length is 2.37 Å. In the twelfth Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. In the thirteenth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first 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 2.69–2.98 Å. In the second Mg site, Mg is bonded to one Mg and four Si atoms to form distorted MgMgSi4 tetrahedra that share corners with two equivalent MgMgSi5 square pyramids and corners with two equivalent MgMgSi4 tetrahedra. The Mg–Mg bond length is 3.13 Å. There are a spread of Mg–Si bond distances ranging from 2.61–2.73 Å. In the third Mg site, Mg is bonded in a 4-coordinate geometry to two equivalent Mg and six Si atoms. There are one shorter (3.10 Å) and one longer (3.30 Å) Mg–Mg bond lengths. There are a spread of Mg–Si bond distances ranging from 2.71–3.21 Å. In the fourth Mg site, Mg is bonded to one Mg and five Si atoms to form distorted MgMgSi5 square pyramids that share a cornercorner with one SiMgSi3 tetrahedra, corners with two equivalent MgMgSi4 tetrahedra, and edges with two equivalent MgMgSi5 square pyramids. The Mg–Mg bond length is 2.91 Å. There are a spread of Mg–Si bond distances ranging from 2.79–2.87 Å. In the fifth 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 2.74–3.15 Å. In the sixth Mg site, Mg is bonded in a 5-coordinate geometry to three Mg and seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.08 Å. In the seventh Mg site, Mg is bonded in a 9-coordinate geometry to one Mg and eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.66–3.06 Å. In the eighth 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 2.90–3.12 Å. There are fourteen inequivalent Si sites. In the first 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 2.41–2.59 Å. In the second Si site, Si is bonded to one Mg and three Si atoms to form distorted SiMgSi3 tetrahedra that share a cornercorner with one MgMgSi5 square pyramid. There are one shorter (2.38 Å) and two longer (2.41 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 6-coordinate geometry to two Mg and four Si atoms. The Si–Si bond length is 2.53 Å. In the fourth Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. There are one shorter (2.42 Å) and one longer (2.48 Å) Si–Si bond lengths. In the fifth Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. There are one shorter (2.42 Å) and one longer (2.47 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 2.50 Å. In the seventh Si site, Si is bonded in a 6-coordinate geometry to two Mg and four Si atoms. The Si–Si bond length is 2.40 Å. In the eighth Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. There are one shorter (2.42 Å) and one longer (2.44 Å) Si–Si bond lengths. In the ninth Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. The Si–Si bond length is 2.31 Å. In the tenth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.44–2.53 Å. In the eleventh Si site, Si is bonded in a 7-coordinate geometry to six Mg and one Si atom. In the twelfth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. The Si–Si bond length is 2.43 Å. In the thirteenth Si site, Si is bonded in a 5-coordinate geometry to one Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to two equivalent Mg and ten Si atoms. Both Mg–Mg bond lengths are 3.06 Å. There are a spread of Mg–Si bond distances ranging from 2.83–3.17 Å. In the second Mg site, Mg is bonded in a distorted rectangular see-saw-like geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–2.88 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 2.80–3.02 Å. In the fourth 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 2.79–3.13 Å. In the fifth Mg site, Mg is bonded in a 10-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.91–3.07 Å. In the sixth Mg site, Mg is bonded in a 12-coordinate geometry to two equivalent Mg and ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.14 Å. In the seventh 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 2.78–2.92 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 2.84–2.96 Å. There are fourteen inequivalent Si sites. In the first 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 2.47–2.77 Å. In the second 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 2.45–2.50 Å. In the third 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 2.47–2.54 Å. In the fourth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. The Si–Si bond length is 2.48 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.39 Å) and one longer (2.40 Å) Si–Si bond lengths. 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 2.41 Å. In the seventh Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. There are one shorter (2.40 Å) and one longer (2.47 Å) Si–Si bond lengths. In the eighth 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 2.45–2.52 Å. In the ninth 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 2.50–2.54 Å. In the tenth 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 2.52–2.68 Å. In the eleventh Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. The Si–Si bond length is 2.84 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 five Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 1-coordinate geometry to three Mg and five Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 9-coordinate geometry to eleven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.78–3.24 Å. In the second Mg site, Mg is bonded in a distorted rectangular see-saw-like geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.87 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 2.74–3.14 Å. In the fourth 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 2.80–3.19 Å. In the fifth 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 2.65–3.00 Å. In the sixth Mg site, Mg is bonded in a 11-coordinate geometry to eleven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.14 Å. In the seventh 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 2.75–3.08 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 2.86–3.00 Å. There are fourteen 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 2.45–2.65 Å. In the second Si site, Si is bonded in a 6-coordinate geometry to four Mg and two Si atoms. There are one shorter (2.40 Å) and one longer (2.51 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. The Si–Si bond length is 2.51 Å. In the fourth Si site, Si is bonded in a 8-coordinate geometry to two Mg and six Si atoms. There are a spread of Si–Si bond distances ranging from 2.48–2.80 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.40 Å) and one longer (2.41 Å) Si–Si bond lengths. 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 2.48 Å. In the seventh Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. There are one shorter (2.41 Å) and one longer (2.65 Å) Si–Si bond lengths. In the eighth 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 2.46–2.55 Å. In the ninth 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 2.49–2.56 Å. In the tenth Si site, Si is bonded in a 1-coordinate geometry to three Mg and five Si atoms. There are one shorter (2.54 Å) and one longer (2.74 Å) Si–Si bond lengths. In the eleventh Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. The Si–Si bond length is 2.57 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 five Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 is Magnesium tetraboride-like structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 9-coordinate geometry to one Mg and thirteen Si atoms. The Mg–Mg bond length is 3.19 Å. There are a spread of Mg–Si bond distances ranging from 2.87–3.18 Å. In the second 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 (3.06 Å) and one longer (3.31 Å) Mg–Mg bond lengths. There are a spread of Mg–Si bond distances ranging from 2.68–2.87 Å. In the third Mg site, Mg is bonded in a 6-coordinate geometry to one Mg and six Si atoms. The Mg–Mg bond length is 3.24 Å. There are a spread of Mg–Si bond distances ranging from 2.78–3.11 Å. In the fourth Mg site, Mg is bonded in a 6-coordinate geometry to two equivalent Mg and six Si atoms. There are one shorter (3.21 Å) and one longer (3.41 Å) Mg–Mg bond lengths. There are a spread of Mg–Si bond distances ranging from 2.79–3.08 Å. In the fifth Mg site, Mg is bonded in a 12-coordinate geometry to three Mg and nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.16 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 2.57–3.01 Å. In the seventh 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 2.80–3.12 Å. In the eighth Mg site, Mg is bonded in a 2-coordinate geometry to three Mg and eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.14 Å. There are fourteen inequivalent Si sites. In the first Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.40–2.52 Å. In the second Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.40–2.52 Å. In the third Si site, Si is bonded in a 6-coordinate geometry to two Mg and four Si atoms. The Si–Si bond length is 2.52 Å. In the fourth Si site, Si is bonded to three Mg and four Si atoms to form distorted edge-sharing SiMg3Si4 hexagonal pyramids. There are one shorter (2.38 Å) and one longer (2.47 Å) Si–Si bond lengths. In the fifth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.42 Å) and one longer (2.44 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 2.45 Å. In the seventh Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. The Si–Si bond length is 2.30 Å. In the eighth 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 2.43–2.51 Å. In the ninth Si site, Si is bonded in a 1-coordinate geometry to six Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.46–2.49 Å. In the tenth Si site, Si is bonded in a 6-coordinate geometry to two Mg and four Si atoms. There are one shorter (2.43 Å) and one longer (2.49 Å) Si–Si bond lengths. In the eleventh Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. The Si–Si bond length is 2.41 Å. In the twelfth Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. In the thirteenth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 6-coordinate geometry to two equivalent Mg and four Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si3 by Materials Project

Mg4Si3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are sixteen 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 2.80–3.02 Å. In the second Mg site, Mg is bonded in a 2-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–3.20 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 2.73–3.02 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 2.81–3.01 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 2.74–2.96 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 2.74–2.87 Å. In the seventh 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 2.79–2.90 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 2.86–2.97 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 2.67–2.84 Å. In the tenth 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 2.72–2.91 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 2.80–3.04 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 2.96–3.07 Å. In the thirteenth 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 2.60–2.94 Å. In the fourteenth 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 2.61–3.13 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 2.74–3.00 Å. In the sixteenth 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 2.75–3.07 Å. There are twelve inequivalent Si sites. In the first Si site, Si is bonded in a 10-coordinate geometry to eight Mg and two Si atoms. There are one shorter (2.46 Å) and one longer (2.65 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. Both Si–Si bond lengths are 2.44 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 2.51–2.63 Å. In the fourth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. The Si–Si bond length is 2.49 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.38 Å) and one longer (2.46 Å) Si–Si bond lengths. 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 9-coordinate geometry to eight Mg and one Si atom. In the eighth Si site, Si is bonded in a 6-coordinate geometry to six Mg and two Si atoms. The Si–Si bond length is 2.79 Å. 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 9-coordinate geometry to six Mg and three Si atoms. In the eleventh Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. In the twelfth Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si3 by Materials Project

Mg4Si3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are sixteen inequivalent Mg sites. In the first 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 2.79–3.25 Å. In the second Mg site, Mg is bonded in a distorted tetrahedral geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.62–3.18 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 2.67–3.19 Å. In the fourth 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 2.73–3.26 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 2.72–2.98 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 2.76–2.91 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 2.80–3.11 Å. In the eighth 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 2.68–2.98 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 2.75–3.01 Å. In the tenth 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 2.75–2.87 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 2.61–2.99 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 2.72–3.11 Å. In the thirteenth Mg site, Mg is bonded in a 2-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.66–3.11 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 2.76–2.97 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 2.69–2.93 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 2.77–2.88 Å. There are twelve inequivalent Si sites. In the first Si site, Si is bonded in a 8-coordinate geometry to six Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.41–2.84 Å. In the second Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. There are one shorter (2.42 Å) and one longer (2.49 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.41–2.68 Å. In the fourth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.43 Å) and one longer (2.69 Å) Si–Si bond lengths. In the fifth Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. The Si–Si bond length is 2.42 Å. 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 8-coordinate geometry to six Mg and two Si atoms. The Si–Si bond length is 2.44 Å. 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 5-coordinate geometry to six Mg and two Si atoms. In the tenth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two 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 2-coordinate geometry to eight Mg and two Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Na7Al10Si14(AgO16)3 by Materials Project

Na7Al10Si14(AgO16)3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are seven inequivalent Na sites. In the first Na site, Na is bonded in a 3-coordinate geometry to three O atoms. There are a spread of Na–O bond distances ranging from 2.35–2.41 Å. In the second Na site, Na is bonded in a 2-coordinate geometry to two O atoms. There are one shorter (2.17 Å) and one longer (2.19 Å) Na–O bond lengths. In the third Na site, Na is bonded in a 3-coordinate geometry to three O atoms. There are a spread of Na–O bond distances ranging from 2.15–2.40 Å. In the fourth Na site, Na is bonded in a 4-coordinate geometry to four O atoms. There are a spread of Na–O bond distances ranging from 2.21–2.77 Å. In the fifth Na site, Na is bonded in a 4-coordinate geometry to four O atoms. There are a spread of Na–O bond distances ranging from 2.21–2.76 Å. In the sixth Na site, Na is bonded in a 4-coordinate geometry to four O atoms. There are a spread of Na–O bond distances ranging from 2.22–2.56 Å. In the seventh Na site, Na is bonded in a 4-coordinate geometry to four O atoms. There are a spread of Na–O bond distances ranging from 2.22–2.60 Å. There are three inequivalent Ag sites. In the first Ag site, Ag is bonded in a distorted trigonal planar geometry to three O atoms. There are a spread of Ag–O bond distances ranging from 2.28–2.49 Å. In the second Ag site, Ag is bonded in a 4-coordinate geometry to four O atoms. There are a spread of Ag–O bond distances ranging from 2.33–2.56 Å. In the third Ag site, Ag is bonded in a distorted trigonal planar geometry to three O atoms. There are a spread of Ag–O bond distances ranging from 2.27–2.48 Å. There are ten inequivalent Al sites. In the first Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with four SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.72–1.79 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 1.72–1.80 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 and corners with three AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.73–1.78 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 1.71–1.85 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 and corners with three AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.72–1.77 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 1.72–1.79 Å. In the seventh Al site, Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with two AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.69–1.82 Å. In the eighth 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 1.69–1.80 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 1.73–1.80 Å. In the tenth 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 1.71–1.78 Å. There are fourteen inequivalent Si sites. In the first 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 1.62–1.67 Å. In the second 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 1.62–1.66 Å. In the third 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 1.59–1.69 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 1.62–1.66 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 1.60–1.66 Å. In the sixth 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 1.59–1.66 Å. In the seventh 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 1.62–1.67 Å. In the eighth 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 1.59–1.70 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 and corners with two SiO4 tetrahedra. 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 1.62–1.65 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 1.61–1.68 Å. In the thirteenth 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 1.61–1.68 Å. In the fourteenth 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. 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 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 two Si atoms. In the fifth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the sixth O site, O is bonded in a distorted bent 150 degrees geometry to one Ag, one Al, and one Si atom. In the seventh O site, O is bonded in a distorted bent 150 degrees geometry to one Ag and two Si atoms. In the eighth O site, O is bonded in a distorted bent 150 degrees geometry to one Ag and two Si atoms. In the ninth O site, O is bonded in a distorted bent 150 degrees geometry to one Ag and two Si atoms. In the tenth O site, O is bonded in a distorted bent 150 degrees geometry to one Ag and two Si atoms. In the eleventh O site, O is bonded in a distorted bent 150 degrees geometry to one Ag, one Al, and one Si atom. In the twelfth O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the thirteenth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the fourteenth O site, O is bonded in a distorted linear geometry to one Ag, one Al, and one Si atom. In the fifteenth O site, O is bonded in a linear geometry to one Al and one Si atom. In the sixteenth O site, O is bonded in a linear geometry to two Si atoms. In the seventeenth O site, O is bonded in a linear geometry to two Si atoms. In the eighteenth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the nineteenth O site, O is bonded in a distorted bent 150 degrees geometry to one Ag and two Si atoms. In the twentieth O site, O is bonded in a distorted bent 150 degrees geometry to one Ag, one Al, and one Si atom. In the twenty-first O site, O is bonded in a distorted bent 150 degrees geometry to one Ag, one Al, and one Si atom. In the twenty-second O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the twenty-third O site, O is bonded in a 3-coordinate geometry to one Na, one Al, and one Si atom. In the twenty-fourth O site, O is bonded in a 2-coordinate geometry to one Na and two Al atoms. In the twenty-fifth O site, O is bonded in a distorted bent 150 degrees geometry to one Al and one Si atom. In the twenty-sixth O site, O is bonded in a 3-coordinate geometry to one Na and two Al atoms. In the twenty-seventh O site, O is bonded in a 3-coordinate geometry to one Na and two Al atoms. In the twenty-eighth O site, O is bonded in a 2-coordinate geometry to one Na and two Al atoms. In the twenty-ninth O site, O is bonded in a 3-coordinate geometry to one Na and two Al atoms. In the thirtieth O site, O is bonded in a 2-coordinate geometry to one Na and two Al atoms. In the thirty-first O site, O is bonded in a distorted trigonal bipyramidal geometry to three Na and two Al atoms. In the thirty-second O site, O is bonded in a 2-coordinate geometry to one Na and two Al atoms. In the thirty-third O site, O is bonded in a 5-coordinate geometry to three Na and two Al atoms. In the thirty-fourth O site, O is bonded in a distorted T-shaped geometry to one Na and two Al atoms. In the thirty-fifth O site, O is bonded in a 2-coordinate geometry to one Na and two Al atoms. In the thirty-sixth O site, O is bonded in a distorted trigonal planar geometry to one Na, one Al, and one Si atom. In the thirty-seventh O site, O is bonded in a distorted trigonal planar geometry to one Na, one Al, and one Si atom. In the thirty-eighth O site, O is bonded in a distorted bent 150 degrees geometry to one Na, one Al, and one Si atom. In the thirty-ninth O site, O is bonded in a distorted bent 150 degrees geometry to one Na, one Al, and one Si atom. In the fortieth O site, O is bonded in a distorted bent 150 degrees geometry to one Na, one Al, and one Si atom. In the forty-first O site, O is bonded in a distorted bent 150 degrees geometry to one Na, one Al, and one Si atom. In the forty-second O site, O is bonded in a distorted trigonal planar geometry to one Na, one Al, and one Si atom. In the forty-third O site, O is bonded in a distorted trigonal planar geometry to one Na, one Al, and one Si atom. In the forty-fourth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the forty-fifth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the forty-sixth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the forty-seventh O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the forty-eighth O site, O is bonded in a bent 150 degrees geometry to two Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 10-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.04 Å. In the second Mg site, Mg is bonded in a distorted rectangular see-saw-like geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.90 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 2.81–3.13 Å. In the fourth 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 2.77–3.23 Å. In the fifth Mg site, Mg is bonded in a 12-coordinate geometry to ten 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 8-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.03 Å. In the seventh 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 2.79–2.98 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 2.74–3.02 Å. There are fourteen 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 2.46–2.53 Å. In the second Si site, Si is bonded in a 6-coordinate geometry to two equivalent Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.39–2.52 Å. In the third Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. There are one shorter (2.54 Å) and one longer (2.57 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. The Si–Si bond length is 2.59 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.37 Å) and one longer (2.40 Å) Si–Si bond lengths. 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 2.39 Å. In the seventh Si site, Si is bonded in a 6-coordinate geometry to two Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.40–2.52 Å. In the eighth 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 2.39–2.54 Å. In the ninth 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 2.52–2.56 Å. In the tenth Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. In the eleventh Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. The Si–Si bond length is 2.59 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 7-coordinate geometry to three Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 3-coordinate geometry to five Mg and two Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to two equivalent Mg and twelve Si atoms. There are one shorter (2.84 Å) and one longer (2.86 Å) Mg–Mg bond lengths. There are a spread of Mg–Si bond distances ranging from 2.90–2.99 Å. In the second Mg site, Mg is bonded in a distorted rectangular see-saw-like geometry to eight Mg and four Si atoms. There are a spread of Mg–Mg bond distances ranging from 3.02–3.11 Å. There are a spread of Mg–Si bond distances ranging from 2.84–2.87 Å. In the third Mg site, Mg is bonded in a 10-coordinate geometry to five Mg and eight Si atoms. There are a spread of Mg–Mg bond distances ranging from 2.82–3.11 Å. There are a spread of Mg–Si bond distances ranging from 2.88–3.13 Å. In the fourth Mg site, Mg is bonded in a 8-coordinate geometry to five Mg and eight Si atoms. There are a spread of Mg–Mg bond distances ranging from 2.82–3.08 Å. There are a spread of Mg–Si bond distances ranging from 2.87–3.11 Å. In the fifth Mg site, Mg is bonded in a 12-coordinate geometry to two equivalent Mg and twelve Si atoms. There are a spread of Mg–Si bond distances ranging from 2.89–3.00 Å. In the sixth Mg site, Mg is bonded in a 6-coordinate geometry to fourteen Si atoms. There are a spread of Mg–Si bond distances ranging from 2.82–3.07 Å. In the seventh Mg site, Mg is bonded in a 8-coordinate geometry to five Mg and eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.88–3.00 Å. In the eighth Mg site, Mg is bonded in a 8-coordinate geometry to five Mg and eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.83–3.01 Å. There are fourteen inequivalent Si sites. In the first 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 2.55–2.73 Å. In the second 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 2.50–2.63 Å. In the third Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. There are one shorter (2.47 Å) and one longer (2.57 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a 10-coordinate geometry to four Mg and six Si atoms. There are a spread of Si–Si bond distances ranging from 2.59–2.91 Å. In the fifth Si site, Si is bonded to ten Mg and two Si atoms to form a mixture of distorted face and corner-sharing SiMg10Si2 cuboctahedra. There are one shorter (2.77 Å) and one longer (2.83 Å) Si–Si bond lengths. In the sixth Si site, Si is bonded in a 11-coordinate geometry to five Mg and six Si atoms. There are a spread of Si–Si bond distances ranging from 2.53–2.97 Å. In the seventh Si site, Si is bonded in a 10-coordinate geometry to four Mg and six Si atoms. There are a spread of Si–Si bond distances ranging from 2.52–2.82 Å. In the eighth Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.56–2.73 Å. In the ninth 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 2.52–2.55 Å. In the tenth Si site, Si is bonded in a 9-coordinate geometry to six Mg and four Si atoms. There are one shorter (2.52 Å) and one longer (2.54 Å) Si–Si bond lengths. In the eleventh Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. In the twelfth Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. In the thirteenth Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a distorted linear geometry to two equivalent Mg and five Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.90–3.00 Å. In the second Mg site, Mg is bonded in a distorted square co-planar geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.66–2.92 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. In the fourth 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 2.79–3.12 Å. In the fifth Mg site, Mg is bonded in a 10-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.90–3.04 Å. In the sixth Mg site, Mg is bonded in a 2-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–2.98 Å. In the seventh 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 2.82–2.94 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 2.80–2.93 Å. There are fourteen inequivalent Si sites. In the first 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 2.46–2.59 Å. In the second Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. There are one shorter (2.46 Å) and two longer (2.53 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 8-coordinate geometry to three Mg and five Si atoms. There are one shorter (2.49 Å) and two longer (2.76 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a 8-coordinate geometry to three Mg and five Si atoms. Both Si–Si bond lengths are 2.77 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. Both Si–Si bond lengths are 2.38 Å. 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 2.39 Å. In the seventh Si site, Si is bonded in a 7-coordinate geometry to two Mg and five Si atoms. There are two shorter (2.44 Å) and one longer (2.46 Å) Si–Si bond lengths. In the eighth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. There are two shorter (2.44 Å) and one longer (2.50 Å) Si–Si bond lengths. In the ninth 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 two longer (2.54 Å) Si–Si bond lengths. In the tenth 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 two longer (2.52 Å) Si–Si bond lengths. In the eleventh Si site, Si is bonded in a 7-coordinate geometry to two Mg and five Si atoms. 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 five Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 10-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.88–3.00 Å. In the second 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 2.61–2.94 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 2.67–2.92 Å. In the fourth 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 2.79–3.08 Å. In the fifth Mg site, Mg is bonded in a 10-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.88–3.05 Å. In the sixth Mg site, Mg is bonded in a 10-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.88–2.94 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 2.79–3.13 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 2.82–2.99 Å. There are fourteen inequivalent Si sites. In the first 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 2.48–2.57 Å. In the second 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 2.47–2.55 Å. In the third Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. There are one shorter (2.43 Å) and one longer (2.46 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. The Si–Si bond length is 2.45 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.36 Å) and one longer (2.42 Å) Si–Si bond lengths. 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 2.46 Å. In the seventh Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.45–2.49 Å. In the eighth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. There are one shorter (2.47 Å) and two longer (2.51 Å) Si–Si bond lengths. In the ninth 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 2.45–2.59 Å. In the tenth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.45–2.52 Å. In the eleventh Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. 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 distorted q6 geometry to five Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 6-coordinate geometry to two equivalent Mg and four Si atoms.

36 MATERIALS SCIENCE↗

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 twelve 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 2.83–2.96 Å. In the second 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 2.71–3.17 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 2.80–2.95 Å. In the fourth 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 2.84–3.18 Å. In the fifth 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 2.82–3.08 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 2.68–2.91 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 2.71–3.02 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 2.72–2.92 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 2.84–3.08 Å. In the tenth 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 2.68–3.07 Å. In the eleventh Mg site, Mg is bonded in a 4-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.18 Å. In the twelfth 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 2.79–3.04 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 2.52–2.66 Å. In the second Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.33 Å) and one longer (2.43 Å) Si–Si bond lengths. 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 2.44–2.51 Å. In the fourth 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 fifth 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 sixth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. The Si–Si bond length is 2.63 Å. 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 2.36 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 2.68 Å. In the ninth 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 tenth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. In the eleventh Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. In the twelfth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 1-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.10 Å. In the second Mg site, Mg is bonded in a rectangular see-saw-like geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.63–2.81 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 2.82–3.11 Å. In the fourth 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 2.81–3.18 Å. In the fifth Mg site, Mg is bonded in a 12-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.94 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 2.76–3.11 Å. In the seventh 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 2.89–2.97 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 2.85–2.97 Å. There are fourteen inequivalent Si sites. In the first 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 2.42–2.88 Å. In the second Si site, Si is bonded in a 10-coordinate geometry to two equivalent Mg and eight Si atoms. There are a spread of Si–Si bond distances ranging from 2.44–2.94 Å. In the third Si site, Si is bonded in a 7-coordinate geometry to two equivalent Mg and seven Si atoms. There are a spread of Si–Si bond distances ranging from 2.45–2.73 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to three Mg and six Si atoms. Both Si–Si bond lengths are 2.56 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.38 Å) and one longer (2.39 Å) Si–Si bond lengths. 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 2.37 Å. In the seventh Si site, Si is bonded in a 9-coordinate geometry to four Mg and five Si atoms. There are one shorter (2.42 Å) and two longer (2.52 Å) Si–Si bond lengths. In the eighth Si site, Si is bonded in a 6-coordinate geometry to three Mg and five Si atoms. There are two shorter (2.52 Å) and one longer (2.53 Å) Si–Si bond lengths. In the ninth 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 2.42–2.83 Å. In the tenth 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 two longer (2.57 Å) Si–Si bond lengths. In the eleventh Si site, Si is bonded in a 9-coordinate geometry to three Mg and six Si atoms. In the twelfth Si site, Si is bonded in a 9-coordinate geometry to four Mg and five Si atoms. In the thirteenth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 10-coordinate geometry to five Mg and five Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to one Mg and thirteen Si atoms. The Mg–Mg bond length is 3.14 Å. There are a spread of Mg–Si bond distances ranging from 2.81–3.10 Å. In the second 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 2.66–3.24 Å. In the third Mg site, Mg is bonded in a 3-coordinate geometry to twelve Si atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.21 Å. In the fourth 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 2.87–3.21 Å. In the fifth Mg site, Mg is bonded in a 3-coordinate geometry to one Mg and nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.59–3.24 Å. In the sixth Mg site, Mg is bonded in a 10-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.83–3.17 Å. In the seventh 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 2.76–3.16 Å. In the eighth Mg site, Mg is bonded in a 1-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.20 Å. There are fourteen inequivalent Si sites. In the first 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 2.44–2.67 Å. In the second Si site, Si is bonded in a 1-coordinate geometry to four Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.37–2.78 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 2.52–2.75 Å. In the fourth Si site, Si is bonded in a 10-coordinate geometry to four Mg and six Si atoms. There are a spread of Si–Si bond distances ranging from 2.58–2.60 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.41 Å) and one longer (2.54 Å) Si–Si bond lengths. In the sixth Si site, Si is bonded in a 12-coordinate geometry to seven Mg and five Si atoms. There are a spread of Si–Si bond distances ranging from 2.48–2.86 Å. In the seventh Si site, Si is bonded in a 8-coordinate geometry to three Mg and five Si atoms. The Si–Si bond length is 2.43 Å. In the eighth Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.54–2.57 Å. In the ninth Si site, Si is bonded in a 10-coordinate geometry to seven Mg and three Si atoms. The Si–Si bond length is 2.45 Å. In the tenth Si site, Si is bonded in a 10-coordinate geometry to five Mg and five Si atoms. There are one shorter (2.51 Å) and two longer (2.68 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 9-coordinate geometry to five Mg and four Si atoms. In the thirteenth Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 2-coordinate geometry to seven Mg and three Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded in a distorted square co-planar geometry to four Si atoms. There are two shorter (2.75 Å) and two longer (3.02 Å) Mg–Si bond lengths. In the second Mg site, Mg is bonded in a square co-planar geometry to four Si atoms. There are two shorter (2.64 Å) and two longer (2.75 Å) Mg–Si bond lengths. In the third 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 2.86–3.16 Å. In the fourth 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 2.85–3.16 Å. In the fifth 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 2.68–3.07 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 2.67–3.09 Å. In the seventh 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 eighth 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 2.79–3.09 Å. There are fourteen inequivalent Si sites. In the first Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. There are two shorter (2.41 Å) and one longer (2.44 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.41–2.44 Å. In the third Si site, Si is bonded in a 5-coordinate geometry to one Mg and four Si atoms. There are one shorter (2.39 Å) and one longer (2.40 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a 5-coordinate geometry to one Mg and four Si atoms. The Si–Si bond length is 2.41 Å. In the fifth 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 (2.40 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 2.40 Å. In the seventh Si site, Si is bonded to two Mg and four Si atoms to form distorted corner-sharing SiMg2Si4 pentagonal pyramids. There are a spread of Si–Si bond distances ranging from 2.42–2.53 Å. In the eighth Si site, Si is bonded to two Mg and four Si atoms to form distorted corner-sharing SiMg2Si4 pentagonal pyramids. There are a spread of Si–Si bond distances ranging from 2.42–2.53 Å. In the ninth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.42 Å) and one longer (2.46 Å) Si–Si bond lengths. In the tenth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.42 Å) and one longer (2.46 Å) Si–Si bond lengths. In the eleventh Si site, Si is bonded in a 5-coordinate geometry to two equivalent Mg and three Si atoms. In the twelfth Si site, Si is bonded in a 5-coordinate geometry to two equivalent Mg and three Si atoms. In the thirteenth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms.

36 MATERIALS SCIENCE↗

Materials Data on Mg4Si7 by Materials Project

Mg4Si7 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight 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 2.76–3.10 Å. In the second Mg site, Mg is bonded in a distorted rectangular see-saw-like geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–2.92 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 2.83–3.21 Å. In the fourth Mg site, Mg is bonded in a 5-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.85–3.18 Å. In the fifth Mg site, Mg is bonded in a 10-coordinate geometry to ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.83–3.17 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 2.63–3.00 Å. In the seventh 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 2.73–2.98 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 2.80–2.97 Å. There are fourteen inequivalent Si sites. In the first Si site, Si is bonded in a 6-coordinate geometry to two equivalent Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.44–2.48 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 (2.49 Å) and one longer (2.74 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 5-coordinate geometry to three Mg and two equivalent Si atoms. In the fourth Si site, Si is bonded in a 6-coordinate geometry to two Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.38–2.46 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. There are one shorter (2.35 Å) and one longer (2.45 Å) Si–Si bond lengths. 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 2.41 Å. In the seventh Si site, Si is bonded in a 2-coordinate geometry to four Mg and three Si atoms. The Si–Si bond length is 2.36 Å. In the eighth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. There are two shorter (2.43 Å) and one longer (2.59 Å) Si–Si bond lengths. In the ninth 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 2.49–2.53 Å. In the tenth Si site, Si is bonded in a 1-coordinate geometry to two Mg and three Si atoms. There are one shorter (2.41 Å) and one longer (2.42 Å) Si–Si bond lengths. In the eleventh Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. The Si–Si bond length is 2.44 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 five Mg and four Si atoms. In the fourteenth Si site, Si is bonded in a 6-coordinate geometry to two equivalent Mg and four Si atoms.

36 MATERIALS SCIENCE↗