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 8-coordinate geometry to eight Si atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.09 Å. In the second Mg site, Mg is bonded in a 12-coordinate geometry to seven Si atoms. There are a spread of Mg–Si bond distances ranging from 2.72–2.99 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 five Si atoms. There are a spread of Si–Si bond distances ranging from 2.41–2.94 Å. In the second 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 2.62–2.86 Å. In the third Si site, Si is bonded in a 8-coordinate geometry to three Mg and five Si atoms. In the fourth Si site, Si is bonded in a 9-coordinate geometry to five Mg and four Si atoms. There are one shorter (2.61 Å) and one longer (2.67 Å) Si–Si bond lengths.