Materials Data on Mg4Si3 by Materials Project

Abstract

Mg4Si3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg sites. In the first Mg site, Mg is bonded to four Si atoms to form a mixture of distorted corner and edge-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.66–2.75 Å. In the second Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.62–2.82 Å. In the third Mg site, Mg is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Mg–Si bond distances ranging from 2.81–2.96 Å. In the fourth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.06 Å. In the fifth Mg site, Mg is bonded in a 5-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.09 Å. In the sixth Mg site, Mg is bonded to five Si atoms to form a mixture of distorted corner and edge-sharing MgSi5 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.66–3.12 Å. In the seventh Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.67–3.09 Å. In the eighth Mg site, Mg is bonded in a 4-coordinate geometry to five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.05 Å. There are six inequivalent Si sites. In the first Si site, Si is bonded in a 6-coordinate geometry to five Mg and one Si atom. The Si–Si bond length is 2.41 Å. In the second Si site, Si is bonded in a 8-coordinate geometry to seven Mg and one Si atom. The Si–Si bond length is 2.40 Å. In the third Si site, Si is bonded in a 7-coordinate geometry to six Mg and one Si atom. The Si–Si bond length is 2.49 Å. In the fourth Si site, Si is bonded in a 8-coordinate geometry to eight Mg atoms. In the fifth Si site, Si is bonded in a 8-coordinate geometry to six Mg and two Si atoms. In the sixth Si site, Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom.