Materials Data on Mg2Si3 by Materials Project

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 8-coordinate geometry to eight Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.74–3.09 Å. In the second Mg2+ site, Mg2+ is bonded to six Si+1.33- atoms to form distorted edge-sharing MgSi6 pentagonal pyramids. There are a spread of Mg–Si bond distances ranging from 2.77–2.90 Å. In the third 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 2.74–3.09 Å. In the fourth Mg2+ site, Mg2+ is bonded to six Si+1.33- atoms to form distorted edge-sharing MgSi6 pentagonal pyramids. There are a spread of Mg–Si bond distances ranging from 2.77–2.89 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 a spread of Si–Si bond distances ranging from 2.45–2.47 Å. In the second Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to four Mg2+ and four Si+1.33- atoms. There are one shorter (2.55 Å) and one longer (2.62 Å) Si–Si bond lengths. In the third 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 a spread of Si–Si bond distances ranging from 2.47–2.62 Å. In the fourth 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 (2.45 Å) and two longer (2.47 Å) Si–Si bond lengths. In the fifth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to four Mg2+ and four Si+1.33- atoms. In the sixth Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+1.33- atoms.