Materials Data on MgSi2 by Materials Project

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 6-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.81–3.24 Å. In the second Mg site, Mg is bonded in a 1-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.67–3.05 Å. There are four inequivalent Si sites. In the first Si site, Si is bonded in a 7-coordinate geometry to three Mg and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.42–2.67 Å. In the second Si site, Si is bonded in a 7-coordinate geometry to three equivalent Mg and four Si atoms. The Si–Si bond length is 2.70 Å. In the third Si site, Si is bonded in a 10-coordinate geometry to four Mg and six Si atoms. There are a spread of Si–Si bond distances ranging from 2.44–2.70 Å. In the fourth Si site, Si is bonded in a 1-coordinate geometry to five Mg and four Si atoms.