Materials Data on Mg2Si3 by Materials Project

Abstract

Mg2Si3 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 5-coordinate geometry to five Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.87–3.01 Å. In the second Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to seven Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.65–3.19 Å. In the third Mg2+ site, Mg2+ is bonded to four Si+1.33- atoms to form distorted corner-sharing MgSi4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.73–2.92 Å. In the fourth Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.62–2.93 Å. In the fifth Mg2+ site, Mg2+ is bonded in a 4-coordinate geometry to five Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.70–3.21 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.72–2.98 Å. In the seventh Mg2+ site, Mg2+ is bonded in a 9-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.72–3.25 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 9-coordinate geometry to nine Si+1.33- atoms. There are a spread of Mg–Si bond distances ranging from 2.71–3.23 Å. There are twelve inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to four Mg2+ and two Si+1.33- atoms. There are one shorter (2.48 Å) and one longer (2.59 Å) Si–Si bond lengths. In the second Si+1.33- site, Si+1.33- is bonded in a 1-coordinate geometry to four Mg2+ and three Si+1.33- atoms. There are one shorter (2.39 Å) and one longer (2.56 Å) Si–Si bond lengths. In the third Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+1.33- atoms. There are one shorter (2.53 Å) and one longer (2.56 Å) Si–Si bond lengths. In the fourth Si+1.33- site, Si+1.33- is bonded in a 6-coordinate geometry to three Mg2+ and three Si+1.33- atoms. The Si–Si bond length is 2.47 Å. In the fifth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to five Mg2+ and three Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.49–2.62 Å. In the sixth Si+1.33- site, Si+1.33- is bonded in a 1-coordinate geometry to two Mg2+ and five Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.53–2.58 Å. In the seventh Si+1.33- site, Si+1.33- is bonded in a 2-coordinate geometry to four Mg2+ and five Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.40–2.67 Å. In the eighth Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to four Mg2+ and six Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.47–2.57 Å. In the ninth Si+1.33- site, Si+1.33- is bonded in a 8-coordinate geometry to six Mg2+ and two Si+1.33- atoms. In the tenth Si+1.33- site, Si+1.33- is bonded in a 2-coordinate geometry to three Mg2+ and four Si+1.33- atoms. In the eleventh Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to four Mg2+ and three Si+1.33- atoms. In the twelfth Si+1.33- site, Si+1.33- is bonded in a 7-coordinate geometry to six Mg2+ and two Si+1.33- atoms.