Materials Data on Mg2Si by Materials Project

Abstract

Mg2Si crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are eight inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a distorted T-shaped geometry to three Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.71–2.85 Å. In the second Mg2+ site, Mg2+ is bonded in a 3-coordinate geometry to four Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.76–3.20 Å. In the third Mg2+ site, Mg2+ is bonded to four Si4- atoms to form corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.70–2.84 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to four Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.68–3.05 Å. In the fifth Mg2+ site, Mg2+ is bonded to four Si4- atoms to form corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.70–2.83 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to four Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.02 Å. In the seventh Mg2+ site, Mg2+ is bonded in a distorted T-shaped geometry to three Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.71–2.89 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to four Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.16 Å. There are four inequivalent Si4- sites. In the first Si4- site, Si4- is bonded in a 9-coordinate geometry to eight Mg2+ and one Si4- atom. The Si–Si bond length is 2.55 Å. In the second Si4- site, Si4- is bonded in a 9-coordinate geometry to eight Mg2+ and one Si4- atom. The Si–Si bond length is 2.54 Å. In the third Si4- site, Si4- is bonded in a 8-coordinate geometry to seven Mg2+ and one Si4- atom. In the fourth Si4- site, Si4- is bonded in a 5-coordinate geometry to seven Mg2+ and one Si4- atom.