DOI: 10.17188/1732357
title: Materials Data on Mg7Si4 by Materials Project

description: Mg7Si4 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are fourteen inequivalent Mg sites. In the first Mg site, Mg is bonded in a 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 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 2.82–2.94 Å. In the third Mg site, Mg is bonded in a distorted water-like geometry to two equivalent Si atoms. There are one shorter (2.74 Å) and one longer (2.77 Å) Mg–Si bond lengths. In the fourth 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 2.71–3.07 Å. In the fifth Mg site, Mg is bonded in a 3-coordinate geometry to one Mg and three Si atoms. The Mg–Mg bond length is 3.10 Å. There are a spread of Mg–Si bond distances ranging from 2.74–2.91 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 2.68–3.17 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 2.76–3.16 Å. In the eighth Mg site, Mg is bonded in a water-like geometry to two equivalent Si atoms. There are one shorter (2.68 Å) and one longer (2.69 Å) Mg–Si bond lengths. In the ninth Mg site, Mg is bonded in a distorted linear geometry to two equivalent Mg and two Si atoms. There are one shorter (3.13 Å) and one longer (3.14 Å) Mg–Mg bond lengths. There are one shorter (2.73 Å) and one longer (2.89 Å) Mg–Si bond lengths. In the tenth Mg site, Mg is bonded in a distorted linear geometry to two equivalent Mg and two Si atoms. There are one shorter (3.15 Å) and one longer (3.17 Å) Mg–Mg bond lengths. There are one shorter (2.71 Å) and one longer (2.80 Å) Mg–Si bond lengths. In the eleventh Mg site, Mg is bonded in a 11-coordinate geometry to six Mg and five Si atoms. The Mg–Mg bond length is 3.07 Å. There are a spread of Mg–Si bond distances ranging from 2.71–3.06 Å. In the twelfth Mg site, Mg is bonded in a trigonal non-coplanar geometry to one Mg and three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.79–2.82 Å. In the thirteenth Mg site, Mg is bonded in a linear geometry to two Si atoms. There are one shorter (2.70 Å) and one longer (2.72 Å) Mg–Si bond lengths. In the fourteenth Mg site, Mg is bonded in an L-shaped geometry to two Si atoms. Both Mg–Si bond lengths are 2.76 Å. There are eight inequivalent Si sites. In the first 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 2.46–2.50 Å. In the second Si site, Si is bonded in a 9-coordinate geometry to six Mg and two Si atoms. There are one shorter (2.43 Å) and one longer (2.47 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 7-coordinate geometry to five Mg and two equivalent Si atoms. There are one shorter (2.44 Å) and one longer (2.49 Å) Si–Si bond lengths. In the fourth Si site, Si is bonded in a 8-coordinate geometry to eight Mg atoms. In the fifth Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. In the sixth Si site, Si is bonded in a 8-coordinate geometry to four Mg and four Si atoms. The Si–Si bond length is 2.69 Å. In the seventh Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. In the eighth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two equivalent Si atoms.