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DOE OSTI2020

Materials Data on Mg4Si3 by Materials Project

Mg4Si3 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 6-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.14 Å. In the second Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.17 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 2.76–2.93 Å. In the fourth Mg site, Mg is bonded in a 3-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.15 Å. In the fifth Mg site, Mg is bonded in a 3-coordinate geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.67–2.82 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 2.82–2.92 Å. In the seventh Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.88–3.11 Å. In the eighth 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 2.69–3.10 Å. There are six inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to five Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.47–2.67 Å. In the second Si site, Si is bonded in a 10-coordinate geometry to six Mg and two Si atoms. The Si–Si bond length is 2.48 Å. In the third Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. The Si–Si bond length is 2.57 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. In the fifth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms. The Si–Si bond length is 2.57 Å. In the sixth Si site, Si is bonded in a 10-coordinate geometry to six Mg and three 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 4-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.18 Å. In the second Mg site, Mg is bonded in a 2-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.74–3.12 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 2.68–3.20 Å. In the fourth 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 2.68–3.29 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 2.72–3.20 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 2.75–3.08 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 2-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.68–3.28 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 2.77–2.99 Å. In the tenth Mg site, Mg is bonded in a 7-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.74–3.14 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 2.38–2.69 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 (2.45 Å) and one longer (2.48 Å) Si–Si bond lengths. 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 2.45–2.85 Å. In the fourth Si site, Si is bonded in a 5-coordinate geometry to seven Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.45–2.90 Å. In the fifth Si site, Si is bonded in a 10-coordinate geometry to seven Mg and three Si atoms. There are one shorter (2.43 Å) and one longer (2.58 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. The Si–Si bond length is 2.52 Å. In the seventh Si site, Si is bonded in a 12-coordinate geometry to six Mg and six Si atoms. There are a spread of Si–Si bond distances ranging from 2.80–3.00 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 2.59 Å. In the ninth Si site, Si is bonded in a 10-coordinate geometry to five Mg and three Si atoms. The Si–Si bond length is 2.79 Å. In the tenth Si site, Si is bonded in a 8-coordinate geometry to five Mg and four Si atoms. The Si–Si bond length is 2.47 Å. In the eleventh Si site, Si is bonded in a 6-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.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgSi2 by Materials Project

MgSi2 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 12-coordinate geometry to two equivalent Mg and ten Si atoms. There are one shorter (3.06 Å) and one longer (3.07 Å) Mg–Mg bond lengths. There are a spread of Mg–Si bond distances ranging from 2.71–3.15 Å. In the second Mg site, Mg is bonded in a 7-coordinate geometry to two equivalent Mg and eight Si atoms. There are one shorter (2.97 Å) and one longer (3.11 Å) Mg–Mg bond lengths. There are a spread of Mg–Si bond distances ranging from 2.72–3.12 Å. In the third Mg site, Mg is bonded in a 7-coordinate geometry to three Mg and seven Si atoms. There are a spread of Mg–Mg bond distances ranging from 2.98–3.10 Å. There are a spread of Mg–Si bond distances ranging from 2.80–2.91 Å. In the fourth Mg site, Mg is bonded in a 8-coordinate geometry to three Mg and eight Si atoms. There are a spread of Mg–Mg bond distances ranging from 3.02–3.07 Å. There are a spread of Mg–Si bond distances ranging from 2.76–2.99 Å. In the fifth 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 2.80–3.25 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 2.71–3.14 Å. In the seventh Mg site, Mg is bonded in a 10-coordinate geometry to two equivalent Mg and ten Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.11 Å. In the eighth Mg site, Mg is bonded in a 11-coordinate geometry to four Mg and seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.82–3.20 Å. There are sixteen 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 2.40–2.54 Å. In the second 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 2.43–2.64 Å. In the third 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 2.42–2.55 Å. In the fourth 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 2.40–2.70 Å. In the fifth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. The Si–Si bond length is 2.42 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 2.42 Å. In the seventh Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. There are one shorter (2.40 Å) and one longer (2.71 Å) Si–Si bond lengths. In the eighth Si site, Si is bonded in a 7-coordinate geometry to two Mg and five Si atoms. There are a spread of Si–Si bond distances ranging from 2.43–2.76 Å. In the ninth Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. The Si–Si bond length is 2.46 Å. In the tenth Si site, Si is bonded in a 9-coordinate geometry to four Mg and five Si atoms. The Si–Si bond length is 2.45 Å. In the eleventh Si site, Si is bonded in a 8-coordinate geometry to six Mg and three Si atoms. There are one shorter (2.44 Å) and one longer (2.45 Å) Si–Si bond lengths. In the twelfth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. The Si–Si bond length is 2.49 Å. In the thirteenth Si site, Si is bonded in a 1-coordinate geometry to five Mg and three Si atoms. In the fourteenth Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. 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 six Mg and three Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg5Si6 by Materials Project

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

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg3Si4 by Materials Project

Mg3Si4 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 six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.88–3.07 Å. In the second 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 2.73–3.05 Å. In the third 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 2.78–3.19 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 2.68–2.97 Å. In the fifth 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 2.73–3.05 Å. In the sixth 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 2.78–3.10 Å. There are eight inequivalent Si sites. In the first Si site, Si is bonded in a 6-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.48 Å) and one longer (2.59 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. Both Si–Si bond lengths are 2.51 Å. In the third 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 2.46–2.61 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. The Si–Si bond length is 2.42 Å. In the fifth Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. Both Si–Si bond lengths are 2.48 Å. In the sixth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. Both Si–Si bond lengths are 2.55 Å. In the seventh Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two equivalent Si atoms. In the eighth Si site, Si is bonded in a 8-coordinate geometry to four Mg and four 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 six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–2.89 Å. In the second Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.10 Å. In the third Mg site, Mg is bonded in a 12-coordinate geometry to nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.69–3.13 Å. In the fourth 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 2.72–3.19 Å. In the fifth 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 2.74–3.12 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 2.75–3.09 Å. There are eight inequivalent Si sites. In the first Si site, Si is bonded in a 2-coordinate geometry to two equivalent Mg and five Si atoms. There are a spread of Si–Si bond distances ranging from 2.48–2.61 Å. In the second 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 2.41–2.62 Å. In the third Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. The Si–Si bond length is 2.49 Å. In the fourth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. The Si–Si bond length is 2.46 Å. In the fifth Si site, Si is bonded in a 10-coordinate geometry to seven Mg and three Si atoms. In the sixth Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. There are one shorter (2.56 Å) and one longer (2.76 Å) Si–Si bond lengths. In the seventh Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. In the eighth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg3Si4 by Materials Project

Mg3Si4 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 2.75–3.13 Å. In the second Mg site, Mg is bonded to five Si atoms to form distorted edge-sharing MgSi5 trigonal bipyramids. There are a spread of Mg–Si bond distances ranging from 2.69–2.96 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 2.74–2.89 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 2.71–3.08 Å. In the fifth 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 2.72–3.03 Å. In the sixth Mg site, Mg is bonded in a 5-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–3.13 Å. There are eight 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 (2.40 Å) and one longer (2.41 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 1-coordinate geometry to six Mg and two equivalent Si atoms. There are one shorter (2.39 Å) and one longer (2.40 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two equivalent Si atoms. There are one shorter (2.46 Å) and one longer (2.47 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. The Si–Si bond length is 2.74 Å. In the fifth Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. In the sixth Si site, Si is bonded in a 7-coordinate geometry to two equivalent Mg and five Si atoms. There are two shorter (2.39 Å) and one longer (2.43 Å) Si–Si bond lengths. In the seventh Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. In the eighth Si site, Si is bonded in a 6-coordinate geometry to four Mg and two equivalent Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgSi2 by Materials Project

MgSi2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Mg is bonded in a 9-coordinate geometry to nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–3.06 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded in a 8-coordinate geometry to five equivalent Mg and three equivalent Si atoms. There are two shorter (2.44 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 four equivalent Mg and four Si atoms. The Si–Si bond length is 2.39 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 7-coordinate geometry to nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–3.25 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 2.79–3.14 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 2.77–2.98 Å. In the fourth Mg site, Mg is bonded in a 3-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.24 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 2.76–3.19 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 2.78–2.87 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 2.69–3.12 Å. In the eighth 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 2.80–3.20 Å. In the ninth 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 2.76–3.11 Å. In the tenth Mg site, Mg is bonded in a 12-coordinate geometry to nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.74–3.05 Å. There are eighteen inequivalent Si sites. In the first Si site, Si is bonded in a 2-coordinate geometry to three Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.45–2.53 Å. In the second 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 2.39–2.48 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 2.40–2.56 Å. In the fourth Si site, Si is bonded in a 2-coordinate geometry to three Mg and six Si atoms. There are a spread of Si–Si bond distances ranging from 2.46–2.90 Å. In the fifth Si site, Si is bonded in a 7-coordinate geometry to four Mg and five Si atoms. There are a spread of Si–Si bond distances ranging from 2.42–2.84 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 2.44–2.71 Å. In the seventh Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. There are one shorter (2.40 Å) and one longer (2.53 Å) Si–Si bond lengths. In the eighth Si site, Si is bonded in a 7-coordinate geometry to four Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.48–2.54 Å. In the ninth Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. There are one shorter (2.44 Å) and one longer (2.53 Å) Si–Si bond lengths. 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 7-coordinate geometry to three Mg and four Si atoms. There are one shorter (2.43 Å) and one longer (2.51 Å) Si–Si bond lengths. In the twelfth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. The Si–Si bond length is 2.54 Å. In the thirteenth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. In the fourteenth Si site, Si is bonded in a 8-coordinate geometry to three Mg and five Si atoms. The Si–Si bond length is 2.70 Å. In the fifteenth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. In the sixteenth Si site, Si is bonded in a 1-coordinate geometry to five Mg and four Si atoms. In the seventeenth Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. In the eighteenth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg4Si3 by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg5Si9 by Materials Project

Mg5Si9 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 2.76–3.26 Å. In the second 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 2.72–3.15 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 2.64–3.17 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 2.72–3.16 Å. In the fifth 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 2.64–3.17 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 2.78–2.99 Å. In the seventh 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 2.68–3.14 Å. In the eighth 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 2.83–3.21 Å. In the ninth 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 2.67–3.14 Å. In the tenth Mg site, Mg is bonded in a 7-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.09 Å. There are eighteen inequivalent Si sites. In the first 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 2.35–2.43 Å. In the second Si site, Si is bonded in a distorted hexagonal planar geometry to two Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.36–2.45 Å. In the third Si site, Si is bonded in a 2-coordinate geometry to four Mg and two Si atoms. There are one shorter (2.40 Å) and one longer (2.46 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 a spread of Si–Si bond distances ranging from 2.36–2.41 Å. In the fifth Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. There are one shorter (2.39 Å) and one longer (2.51 Å) Si–Si bond lengths. In the sixth 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 2.37–2.45 Å. In the seventh Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. There are two shorter (2.39 Å) and one longer (2.43 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. There are one shorter (2.40 Å) and one longer (2.47 Å) Si–Si bond lengths. In the ninth 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 (2.47 Å) Si–Si bond lengths. In the tenth Si site, Si is bonded to five Mg and two Si atoms to form distorted corner-sharing SiMg5Si2 pentagonal bipyramids. In the eleventh Si site, Si is bonded in a 5-coordinate geometry to three Mg and three Si atoms. The Si–Si bond length is 2.36 Å. In the twelfth Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. In the thirteenth Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. In the fourteenth Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. In the fifteenth Si site, Si is bonded in a 6-coordinate geometry to four Mg and two Si atoms. In the sixteenth Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. In the seventeenth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. In the eighteenth Si site, Si is bonded to five Mg and two Si atoms to form distorted corner-sharing SiMg5Si2 pentagonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg6Si5 by Materials Project

Mg6Si5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twelve inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a distorted trigonal non-coplanar geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.75–2.80 Å. In the second 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 2.68–3.16 Å. In the third Mg2+ site, Mg2+ is bonded to seven Si+2.40- atoms to form edge-sharing MgSi7 pentagonal bipyramids. There are a spread of Mg–Si bond distances ranging from 2.73–3.06 Å. In the fourth 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 2.73–3.07 Å. In the fifth Mg2+ site, Mg2+ is bonded to four Si+2.40- atoms to form distorted corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.66–2.91 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 3-coordinate geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.84–3.06 Å. In the seventh Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to six Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.82–3.21 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.68–2.85 Å. In the ninth Mg2+ site, Mg2+ is bonded in a 3-coordinate geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.67–3.00 Å. In the tenth 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 (2.93 Å) Mg–Si bond lengths. In the eleventh Mg2+ site, Mg2+ is bonded in a T-shaped geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.71–2.87 Å. 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 2.70–3.19 Å. There are ten inequivalent Si+2.40- sites. In the first Si+2.40- site, Si+2.40- is bonded in a 7-coordinate geometry to five Mg2+ and two Si+2.40- atoms. There are one shorter (2.42 Å) and one longer (2.44 Å) Si–Si bond lengths. In the second Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to five Mg2+ and three Si+2.40- atoms. There are one shorter (2.43 Å) and one longer (2.51 Å) Si–Si bond lengths. In the third Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+2.40- atoms. Both Si–Si bond lengths are 2.42 Å. In the fourth Si+2.40- site, Si+2.40- is bonded in a 1-coordinate geometry to three Mg2+ and three Si+2.40- atoms. There are one shorter (2.41 Å) and one longer (2.45 Å) Si–Si bond lengths. In the fifth Si+2.40- site, Si+2.40- is bonded in a 7-coordinate geometry to five Mg2+ and two Si+2.40- atoms. The Si–Si bond length is 2.38 Å. In the sixth Si+2.40- site, Si+2.40- is bonded in a 7-coordinate geometry to five Mg2+ and two Si+2.40- atoms. There are one shorter (2.40 Å) and one longer (2.42 Å) Si–Si bond lengths. In the seventh Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+2.40- atoms. In the eighth Si+2.40- site, Si+2.40- is bonded in a 7-coordinate geometry to five Mg2+ and two Si+2.40- atoms. In the ninth Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to seven Mg2+ and one Si+2.40- atom. In the tenth Si+2.40- site, Si+2.40- is bonded in a 1-coordinate geometry to five Mg2+ and three Si+2.40- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg4Si3 by Materials Project

Mg4Si3 is beta Plutonium-derived structured and crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Mg sites. In the first Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.65–2.79 Å. In the second Mg site, Mg is bonded in a 1-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.87–3.13 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 2.76–3.25 Å. In the fourth 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 2.90–3.11 Å. There are four inequivalent Si sites. In the first Si site, Si is bonded in a 11-coordinate geometry to nine Mg and two Si atoms. There are one shorter (2.72 Å) and one longer (2.83 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 2-coordinate geometry to eight Mg and three Si atoms. There are one shorter (2.61 Å) and one longer (2.68 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. Both Si–Si bond lengths are 2.87 Å. In the fourth Si site, Si is bonded in a 12-coordinate geometry to eight Mg and four Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgSi2 by Materials Project

MgSi2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Mg sites. In the first 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 2.74–3.18 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 2.80–2.93 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 2.82–3.02 Å. In the fourth 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 2.76–3.18 Å. There are eight 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 2.38–2.44 Å. In the second Si site, Si is bonded in a 7-coordinate geometry to four Mg and three Si atoms. There are two shorter (2.39 Å) and one longer (2.40 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 6-coordinate geometry to two equivalent Mg and four Si atoms. There are two shorter (2.34 Å) and one longer (2.60 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a distorted hexagonal planar geometry to two equivalent Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.34–2.54 Å. In the fifth Si site, Si is bonded in a 7-coordinate geometry to five Mg and two equivalent Si atoms. In the sixth Si site, Si is bonded in a 7-coordinate geometry to five Mg and two equivalent Si atoms. 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 2.42 Å. In the eighth Si site, Si is bonded in a 6-coordinate geometry to two Mg and four Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

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 4-coordinate geometry to five 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 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.78–2.84 Å. In the third Mg site, Mg is bonded in a 2-coordinate geometry to six Mg and five Si atoms. There are a spread of Mg–Mg bond distances ranging from 2.95–3.20 Å. There are a spread of Mg–Si bond distances ranging from 2.82–3.04 Å. In the fourth Mg site, Mg is bonded in a 3-coordinate geometry to three Si atoms. There are two shorter (2.89 Å) and one longer (3.02 Å) Mg–Si bond lengths. In the fifth Mg site, Mg is bonded in a 2-coordinate geometry to one Mg and four Si atoms. The Mg–Mg bond length is 3.17 Å. There are a spread of Mg–Si bond distances ranging from 2.85–3.01 Å. In the sixth Mg site, Mg is bonded in a 2-coordinate geometry to one Mg and six Si atoms. The Mg–Mg bond length is 3.00 Å. There are a spread of Mg–Si bond distances ranging from 2.73–3.18 Å. In the seventh Mg site, Mg is bonded in a 4-coordinate geometry to one Mg and four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.01 Å. In the eighth Mg site, Mg is bonded in a 3-coordinate geometry to one Mg and five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.86–3.16 Å. In the ninth Mg site, Mg is bonded in a 5-coordinate geometry to one Mg and five Si atoms. The Mg–Mg bond length is 3.05 Å. There are a spread of Mg–Si bond distances ranging from 2.72–2.94 Å. In the tenth Mg site, Mg is bonded in a 5-coordinate geometry to one Mg and five Si atoms. The Mg–Mg bond length is 3.00 Å. There are a spread of Mg–Si bond distances ranging from 2.83–3.00 Å. In the eleventh Mg site, Mg is bonded in a 3-coordinate geometry to one Mg and three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.78–2.84 Å. In the twelfth Mg site, Mg is bonded in a 4-coordinate geometry to one Mg and five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.74–3.20 Å. In the thirteenth Mg site, Mg is bonded in a 11-coordinate geometry to six Mg and five Si atoms. The Mg–Mg bond length is 3.18 Å. There are a spread of Mg–Si bond distances ranging from 2.78–3.25 Å. In the fourteenth Mg site, Mg is bonded in a 2-coordinate geometry to two Mg and five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.78–3.11 Å. In the fifteenth Mg site, Mg is bonded in a 3-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.11 Å. In the sixteenth 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 2.84–3.08 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 2.46–2.69 Å. In the second 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 (2.69 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.37 Å) and one longer (2.50 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 a spread of Si–Si bond distances ranging from 2.47–2.80 Å. In the fifth Si site, Si is bonded in a 7-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.49 Å) and one longer (2.58 Å) Si–Si bond lengths. In the sixth Si site, Si is bonded in a 11-coordinate geometry to six Mg and two Si atoms. In the seventh 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 eighth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. The Si–Si bond length is 2.54 Å. In the ninth Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. In the tenth Si site, Si is bonded in a 10-coordinate geometry to eight Mg and two Si atoms. In the eleventh Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. In the twelfth 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 Mg2Si3 by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg3Si4 by Materials Project

Mg3Si4 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 12-coordinate geometry to five Mg and seven Si atoms. There are a spread of Mg–Mg bond distances ranging from 2.92–3.18 Å. There are a spread of Mg–Si bond distances ranging from 2.69–3.08 Å. In the second Mg site, Mg is bonded in a 12-coordinate geometry to two Mg and eight Si atoms. The Mg–Mg bond length is 3.00 Å. There are a spread of Mg–Si bond distances ranging from 2.77–3.16 Å. In the third Mg site, Mg is bonded in a 4-coordinate geometry to two Mg and six Si atoms. The Mg–Mg bond length is 3.31 Å. There are a spread of Mg–Si bond distances ranging from 2.82–3.16 Å. In the fourth Mg site, Mg is bonded in a 8-coordinate geometry to four Mg and nine Si atoms. Both Mg–Mg bond lengths are 3.29 Å. There are a spread of Mg–Si bond distances ranging from 2.77–3.20 Å. In the fifth Mg site, Mg is bonded in a 12-coordinate geometry to four Mg and nine Si atoms. The Mg–Mg bond length is 2.99 Å. There are a spread of Mg–Si bond distances ranging from 2.76–3.22 Å. In the sixth Mg site, Mg is bonded in a 4-coordinate geometry to three Mg and six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.14 Å. There are eight 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 2.44–2.86 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 2.55–2.66 Å. In the third 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 (2.58 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a 11-coordinate geometry to four Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.60–2.69 Å. In the fifth Si site, Si is bonded in a 10-coordinate geometry to seven Mg and three Si atoms. The Si–Si bond length is 2.89 Å. In the sixth Si site, Si is bonded in a 10-coordinate geometry to six Mg and four Si atoms. The Si–Si bond length is 2.66 Å. In the seventh Si site, Si is bonded in a 11-coordinate geometry to seven Mg and four 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 Mg6Si5 by Materials Project

Mg6Si5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twelve inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a 3-coordinate geometry to three Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.79–2.84 Å. In the second Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to seven Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.27 Å. In the third Mg2+ site, Mg2+ is bonded in a 7-coordinate geometry to seven Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.78–3.19 Å. In the fourth 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 2.78–2.94 Å. In the fifth Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.71–2.89 Å. In the sixth 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 2.76–3.03 Å. In the seventh Mg2+ site, Mg2+ is bonded in a distorted hexagonal planar geometry to six Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.76–2.90 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 7-coordinate geometry to seven Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.18 Å. In the ninth Mg2+ site, Mg2+ is bonded to five Si+2.40- atoms to form distorted corner-sharing MgSi5 trigonal bipyramids. There are a spread of Mg–Si bond distances ranging from 2.71–2.86 Å. In the tenth Mg2+ site, Mg2+ is bonded in a linear geometry to two Si+2.40- atoms. There are one shorter (2.76 Å) and one longer (2.77 Å) Mg–Si bond lengths. In the eleventh Mg2+ site, Mg2+ is bonded in a distorted rectangular see-saw-like geometry to four Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.73–3.04 Å. In the twelfth Mg2+ site, Mg2+ is bonded in a distorted rectangular see-saw-like geometry to four Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.69–2.84 Å. There are ten inequivalent Si+2.40- sites. In the first Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+2.40- atoms. There are one shorter (2.43 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. There are one shorter (2.45 Å) and one longer (2.56 Å) Si–Si bond lengths. In the third Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+2.40- atoms. There are one shorter (2.37 Å) and one longer (2.41 Å) Si–Si bond lengths. In the fourth Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+2.40- atoms. There are one shorter (2.37 Å) and one longer (2.44 Å) Si–Si bond lengths. 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 2.56 Å. In the sixth Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to five Mg2+ and three Si+2.40- atoms. The Si–Si bond length is 2.50 Å. In the seventh Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to five Mg2+ and three Si+2.40- atoms. The Si–Si bond length is 2.48 Å. In the eighth Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to five 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 seven Mg2+ and one Si+2.40- atom. In the tenth Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+2.40- atoms.

36 MATERIALS SCIENCE↗