DOI: 10.17188/1728901
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 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–2.85 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 2.74–2.91 Å. In the third Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.75–2.84 Å. In the fourth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.76–2.91 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 2.66–2.82 Å. In the sixth Mg site, Mg is bonded in a distorted water-like geometry to two Si atoms. There are one shorter (2.78 Å) and one longer (2.86 Å) Mg–Si bond lengths. In the seventh Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.78–3.18 Å. In the eighth Mg site, Mg is bonded in a distorted water-like geometry to two Si atoms. There are one shorter (2.75 Å) and one longer (2.83 Å) Mg–Si bond lengths. In the ninth 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 2.83–2.89 Å. In the tenth Mg site, Mg is bonded in a 3-coordinate geometry to three Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.77 Å. In the eleventh Mg site, Mg is bonded in a 3-coordinate geometry to three Si atoms. There are one shorter (2.79 Å) and two longer (2.84 Å) Mg–Si bond lengths. In the twelfth 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 2.77–2.84 Å. In the thirteenth Mg site, Mg is bonded in a 4-coordinate geometry to four Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–2.91 Å. In the fourteenth 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 2.78–2.93 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 (2.38 Å) and one longer (2.40 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. The Si–Si bond length is 2.47 Å. In the third Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. In the fourth Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms. There are one shorter (2.36 Å) and one longer (2.44 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. In the sixth Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. The Si–Si bond length is 2.44 Å. In the seventh Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. In the eighth Si site, Si is bonded in a 7-coordinate geometry to five Mg and two Si atoms.