Materials Data on Mg2Si3 by Materials Project

Abstract

Mg2Si3 is Magnesium tetraboride-like structured and 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 5-coordinate geometry to six Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.74–3.20 Å. In the second Mg2+ site, Mg2+ is bonded in a 1-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.19 Å. In the third 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 2.74–3.09 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.00 Å. There are six inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 1-coordinate geometry to four Mg2+ and four Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.46–2.81 Å. In the second Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to four Mg2+ and five Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.43–2.51 Å. 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. There are one shorter (2.43 Å) and one longer (2.50 Å) Si–Si bond lengths. In the fourth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to seven Mg2+ and one Si+1.33- atom. In the fifth Si+1.33- site, Si+1.33- is bonded in a 2-coordinate geometry to five Mg2+ and four Si+1.33- atoms. In the sixth Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to two Mg2+ and four Si+1.33- atoms. The Si–Si bond length is 2.49 Å.