Materials Data on Mg2Si3 by Materials Project

Abstract

Mg2Si3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a 7-coordinate geometry to eight Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.17 Å. In the second Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.11 Å. In the third Mg2+ site, Mg2+ is bonded to five Si+1.33- atoms to form corner-sharing MgSi5 trigonal bipyramids. There are a spread of Mg–Si bond distances ranging from 2.79–2.94 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 7-coordinate geometry to seven Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.10 Å. There are six inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. There are one shorter (2.38 Å) and two longer (2.46 Å) Si–Si bond lengths. In the second Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms. There are one shorter (2.42 Å) and two longer (2.46 Å) Si–Si bond lengths. In the third Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to five Mg2+ and three Si+1.33- atoms. The Si–Si bond length is 2.43 Å. In the fourth Si+1.33- site, Si+1.33- is bonded in a 5-coordinate geometry to one Mg2+ and four Si+1.33- atoms. The Si–Si bond length is 2.55 Å. In the fifth Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms. The Si–Si bond length is 2.44 Å. In the sixth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+1.33- atoms. The Si–Si bond length is 2.48 Å.