Materials Data on Sr3Mg(SiO4)2 by Materials Project
Sr3MgSi2O8 crystallizes in the monoclinic C2 space group. The structure is three-dimensional. there are four inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 10-coordinate geometry to eight O2- atoms. There are a spread of Sr–O bond distances ranging from 2.59–2.97 Å. In the second Sr2+ site, Sr2+ is bonded in a 10-coordinate geometry to eight O2- atoms. There are a spread of Sr–O bond distances ranging from 2.59–2.93 Å. In the third Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.39–2.86 Å. In the fourth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.39–2.86 Å. Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with six SiO4 tetrahedra. There are a spread of Mg–O bond distances ranging from 2.08–2.18 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with three equivalent MgO6 octahedra. The corner-sharing octahedra tilt angles range from 8–37°. There are a spread of Si–O bond distances ranging from 1.62–1.67 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with three equivalent MgO6 octahedra. The corner-sharing octahedra tilt angles range from 8–37°. There are a spread of Si–O bond distances ranging from 1.62–1.67 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two Sr2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three Sr2+, one Mg2+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to four Sr2+, one Mg2+, and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to three Sr2+, one Mg2+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to four Sr2+, one Mg2+, and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to four Sr2+, one Mg2+, and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to two Sr2+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to four Sr2+, one Mg2+, and one Si4+ atom.