Materials Data on Mg3Si4 by Materials Project

Abstract

Mg3Si4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to nine Si atoms. There are a spread of Mg–Si bond distances ranging from 2.80–3.13 Å. In the second Mg site, Mg is bonded in a 5-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.73–3.22 Å. In the third Mg site, Mg is bonded in a distorted square co-planar geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.92–3.21 Å. In the fourth 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 2.78–2.83 Å. There are four inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to four Mg and three Si atoms. There are two shorter (2.47 Å) and one longer (2.67 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 8-coordinate geometry to five Mg and three Si atoms. The Si–Si bond length is 2.41 Å. In the third Si site, Si is bonded in a 9-coordinate geometry to six Mg and three Si atoms. There are a spread of Si–Si bond distances ranging from 2.54–2.79 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to seven Mg and two equivalent Si atoms.