DOI: 10.17188/1321316
title: Materials Data on Mg(SnO2)2 by Materials Project

description: Mg(SnO2)2 is Spinel-like structured and crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are six inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded to four O2- atoms to form MgO4 tetrahedra that share corners with three MgO6 octahedra and corners with six SnO6 octahedra. The corner-sharing octahedra tilt angles range from 54–57°. There are a spread of Mg–O bond distances ranging from 2.03–2.46 Å. In the second Mg2+ site, Mg2+ is bonded to six O2- atoms to form distorted MgO6 octahedra that share corners with six SnO4 tetrahedra, edges with two MgO6 octahedra, and edges with four SnO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.23–2.27 Å. In the third Mg2+ site, Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with two equivalent MgO4 tetrahedra, corners with three SnO4 tetrahedra, an edgeedge with one MgO6 octahedra, and edges with four equivalent SnO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.06–2.30 Å. In the fourth Mg2+ site, Mg2+ is bonded to six O2- atoms to form distorted MgO6 octahedra that share corners with six SnO4 tetrahedra, edges with two MgO6 octahedra, and edges with four SnO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.18–2.25 Å. In the fifth Mg2+ site, Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with six SnO4 tetrahedra, edges with two MgO6 octahedra, and edges with four equivalent SnO6 octahedra. There are two shorter (2.10 Å) and four longer (2.23 Å) Mg–O bond lengths. In the sixth Mg2+ site, Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share a cornercorner with one MgO4 tetrahedra, corners with three SnO4 tetrahedra, an edgeedge with one MgO6 octahedra, and edges with four equivalent SnO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.11–2.37 Å. There are nine inequivalent Sn3+ sites. In the first Sn3+ site, Sn3+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with two equivalent MgO4 tetrahedra, corners with three SnO4 tetrahedra, edges with two equivalent SnO6 octahedra, and edges with three MgO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.07–2.21 Å. In the second Sn3+ site, Sn3+ is bonded to four O2- atoms to form SnO4 tetrahedra that share corners with six MgO6 octahedra and corners with six SnO6 octahedra. The corner-sharing octahedra tilt angles range from 56–68°. There are a spread of Sn–O bond distances ranging from 2.19–2.63 Å. In the third Sn3+ site, Sn3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sn–O bond distances ranging from 2.31–2.75 Å. In the fourth Sn3+ site, Sn3+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with six SnO4 tetrahedra, edges with two equivalent SnO6 octahedra, and edges with four MgO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.09–2.15 Å. In the fifth Sn3+ site, Sn3+ is bonded to four O2- atoms to form SnO4 tetrahedra that share corners with six MgO6 octahedra and corners with six SnO6 octahedra. The corner-sharing octahedra tilt angles range from 59–66°. There are a spread of Sn–O bond distances ranging from 2.22–2.57 Å. In the sixth Sn3+ site, Sn3+ is bonded to six O2- atoms to form SnO6 octahedra that share a cornercorner with one MgO4 tetrahedra, corners with three SnO4 tetrahedra, edges with two equivalent SnO6 octahedra, and edges with three MgO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.07–2.18 Å. In the seventh Sn3+ site, Sn3+ is bonded to four O2- atoms to form SnO4 tetrahedra that share corners with six MgO6 octahedra and corners with six SnO6 octahedra. The corner-sharing octahedra tilt angles range from 56–69°. There are a spread of Sn–O bond distances ranging from 2.20–2.52 Å. In the eighth Sn3+ site, Sn3+ is bonded to four O2- atoms to form SnO4 tetrahedra that share corners with six MgO6 octahedra and corners with six SnO6 octahedra. The corner-sharing octahedra tilt angles range from 57–69°. There are a spread of Sn–O bond distances ranging from 2.20–2.48 Å. In the ninth Sn3+ site, Sn3+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Sn–O bond distances ranging from 2.12–2.75 Å. There are eighteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to two Mg2+ and two Sn3+ atoms. In the second O2- site, O2- is bonded to one Mg2+ and three Sn3+ atoms to form distorted corner-sharing OMgSn3 tetrahedra. In the third O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Mg2+ and three Sn3+ atoms. In the fourth O2- site, O2- is bonded to two Mg2+ and two Sn3+ atoms to form OMg2Sn2 tetrahedra that share corners with twelve OMgSn3 tetrahedra and edges with three OMg2Sn2 tetrahedra. In the fifth O2- site, O2- is bonded to one Mg2+ and three Sn3+ atoms to form OMgSn3 tetrahedra that share corners with eight OMgSn3 tetrahedra and edges with two equivalent OMg2Sn2 tetrahedra. In the sixth O2- site, O2- is bonded to one Mg2+ and three Sn3+ atoms to form a mixture of distorted edge and corner-sharing OMgSn3 tetrahedra. In the seventh O2- site, O2- is bonded to two Mg2+ and two Sn3+ atoms to form a mixture of distorted edge and corner-sharing OMg2Sn2 tetrahedra. In the eighth O2- site, O2- is bonded in a 4-coordinate geometry to one Mg2+ and three Sn3+ atoms. In the ninth O2- site, O2- is bonded to one Mg2+ and three Sn3+ atoms to form distorted OMgSn3 tetrahedra that share corners with twelve OMgSn3 tetrahedra and edges with three OMg2Sn2 tetrahedra. In the tenth O2- site, O2- is bonded to two Mg2+ and two Sn3+ atoms to form distorted OMg2Sn2 tetrahedra that share corners with eight OMgSn3 tetrahedra, a cornercorner with one OSn4 trigonal pyramid, and edges with two OMg2Sn2 tetrahedra. In the eleventh O2- site, O2- is bonded to one Mg2+ and three Sn3+ atoms to form a mixture of edge and corner-sharing OMgSn3 tetrahedra. In the twelfth O2- site, O2- is bonded to two Mg2+ and two Sn3+ atoms to form distorted OMg2Sn2 tetrahedra that share corners with twelve OMg2Sn2 tetrahedra and edges with three OMgSn3 tetrahedra. In the thirteenth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two Mg2+ and two equivalent Sn3+ atoms. In the fourteenth O2- site, O2- is bonded to one Mg2+ and three Sn3+ atoms to form distorted OMgSn3 tetrahedra that share corners with twelve OMg2Sn2 tetrahedra and edges with three OMgSn3 tetrahedra. In the fifteenth O2- site, O2- is bonded to one Mg2+ and three Sn3+ atoms to form OMgSn3 tetrahedra that share corners with eight OMgSn3 tetrahedra, corners with two equivalent OSn4 trigonal pyramids, and edges with two equivalent OMg2Sn2 tetrahedra. In the sixteenth O2- site, O2- is bonded to four Sn3+ atoms to form distorted OSn4 trigonal pyramids that share corners with four OMg2Sn2 tetrahedra and an edgeedge with one OMgSn3 tetrahedra. In the seventeenth O2- site, O2- is bonded in a 3-coordinate geometry to one Mg2+ and three Sn3+ atoms. In the eighteenth O2- site, O2- is bonded to one Mg2+ and three Sn3+ atoms to form distorted OMgSn3 tetrahedra that share corners with nine OMg2Sn2 tetrahedra and an edgeedge with one OSn4 trigonal pyramid.