Materials Data on Mg2Si by Materials Project

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 6-coordinate geometry to six Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.87–3.11 Å. In the second Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to five Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.75–3.13 Å. In the third Mg2+ site, Mg2+ is bonded in a distorted see-saw-like geometry to four Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.06 Å. In the fourth Mg2+ site, Mg2+ is bonded in a T-shaped geometry to three Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.77–2.97 Å. In the fifth Mg2+ site, Mg2+ is bonded in a distorted hexagonal planar geometry to six Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.84–3.08 Å. In the sixth Mg2+ site, Mg2+ is bonded in a distorted see-saw-like geometry to four Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.04 Å. In the seventh Mg2+ site, Mg2+ is bonded in a distorted see-saw-like geometry to four Si4- atoms. There are a spread of Mg–Si bond distances ranging from 2.90–2.98 Å. In the eighth Mg2+ site, Mg2+ is bonded to five Si4- atoms to form distorted corner-sharing MgSi5 trigonal bipyramids. There are a spread of Mg–Si bond distances ranging from 2.88–3.13 Å. There are four inequivalent Si4- sites. In the first Si4- site, Si4- is bonded in a 11-coordinate geometry to eleven Mg2+ atoms. In the second Si4- site, Si4- is bonded in a 10-coordinate geometry to nine Mg2+ and one Si4- atom. The Si–Si bond length is 2.54 Å. In the third Si4- site, Si4- is bonded in a 10-coordinate geometry to eight Mg2+ and two Si4- atoms. The Si–Si bond length is 2.54 Å. In the fourth Si4- site, Si4- is bonded in a 10-coordinate geometry to nine Mg2+ and one Si4- atom.