Materials Data on Mg3Si4 by Materials Project

Abstract

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 7-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.15 Å. In the second Mg site, Mg is bonded to six Si atoms to form distorted corner-sharing MgSi6 trigonal bipyramids. There are a spread of Mg–Si bond distances ranging from 2.79–3.19 Å. In the third Mg site, Mg is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.94 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 2.69–3.09 Å. In the fifth 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 2.80–3.17 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 2.88–3.05 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 2.44–2.53 Å. In the second 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 2.50–2.95 Å. In the third Si site, Si is bonded in a 2-coordinate geometry to five Mg and five Si atoms. There are a spread of Si–Si bond distances ranging from 2.61–2.71 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 2.43 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 2.57 Å. In the sixth Si site, Si is bonded in a 10-coordinate geometry to five Mg and five Si atoms. Both Si–Si bond lengths are 2.47 Å. In the seventh Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. In the eighth Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms.