Materials Data on Mg6Si5 by Materials Project

Abstract

Mg6Si5 crystallizes in the triclinic P1 space group. The structure is two-dimensional and consists of one Mg6Si5 sheet oriented in the (0, 0, 1) direction. there are twelve inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a single-bond geometry to one Si+2.40- atom. The Mg–Si bond length is 2.70 Å. In the second Mg2+ site, Mg2+ is bonded in a square co-planar geometry to four Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.73–2.88 Å. In the third Mg2+ site, Mg2+ is bonded in a 5-coordinate geometry to eight Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.78–3.20 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.79–3.14 Å. In the fifth Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.90–3.13 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.85–3.10 Å. In the seventh Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.83–3.00 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 8-coordinate geometry to eight Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.82–2.98 Å. In the ninth Mg2+ site, Mg2+ is bonded in a single-bond geometry to one Si+2.40- atom. The Mg–Si bond length is 2.91 Å. In the tenth Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to four Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.77–3.01 Å. In the eleventh Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to five Si+2.40- atoms. There are a spread of Mg–Si bond distances ranging from 2.80–3.19 Å. In the twelfth Mg2+ site, Mg2+ is bonded in a single-bond geometry to one Si+2.40- atom. The Mg–Si bond length is 2.69 Å. There are ten inequivalent Si+2.40- sites. In the first Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to seven Mg2+ and two Si+2.40- atoms. There are one shorter (2.36 Å) and one longer (2.42 Å) Si–Si bond lengths. In the second Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to seven Mg2+ and two Si+2.40- atoms. The Si–Si bond length is 2.44 Å. In the third Si+2.40- site, Si+2.40- is bonded in a 1-coordinate geometry to six Mg2+ and three Si+2.40- atoms. There are two shorter (2.43 Å) and one longer (2.64 Å) Si–Si bond lengths. In the fourth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+2.40- atoms. There are a spread of Si–Si bond distances ranging from 2.45–2.64 Å. In the fifth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+2.40- atoms. There are a spread of Si–Si bond distances ranging from 2.48–2.53 Å. In the sixth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+2.40- atoms. There are one shorter (2.53 Å) and two longer (2.54 Å) Si–Si bond lengths. In the seventh Si+2.40- site, Si+2.40- is bonded in a 8-coordinate geometry to five Mg2+ and three Si+2.40- atoms. In the eighth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to six Mg2+ and three Si+2.40- atoms. In the ninth Si+2.40- site, Si+2.40- is bonded in a 10-coordinate geometry to six Mg2+ and four Si+2.40- atoms. In the tenth Si+2.40- site, Si+2.40- is bonded in a 9-coordinate geometry to five Mg2+ and four Si+2.40- atoms.