Materials Data on MgSi2 by Materials Project

Abstract

MgSi2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first 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 2.87–3.11 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 2.71–2.95 Å. There are four inequivalent Si sites. In the first Si site, Si is bonded in a 7-coordinate geometry to three equivalent Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.40–2.45 Å. In the second Si site, Si is bonded in a 6-coordinate geometry to three Mg and three Si atoms. There are two shorter (2.38 Å) and one longer (2.39 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. In the fourth Si site, Si is bonded in a 7-coordinate geometry to three equivalent Mg and four Si atoms.