Materials Data on Mg2Sb3O8 by Materials Project
Mg2Sb3O8 is beta indium sulfide-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Mg is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Mg–O bond distances ranging from 2.12–2.46 Å. There are two inequivalent Sb sites. In the first Sb site, Sb is bonded to six O atoms to form edge-sharing SbO6 octahedra. There are four shorter (2.29 Å) and two longer (2.37 Å) Sb–O bond lengths. In the second Sb site, Sb is bonded to six O atoms to form edge-sharing SbO6 octahedra. There are a spread of Sb–O bond distances ranging from 2.05–2.16 Å. There are three inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to one Mg and two equivalent Sb atoms. In the second O site, O is bonded in a rectangular see-saw-like geometry to one Mg and three Sb atoms. In the third O site, O is bonded to two equivalent Mg and two Sb atoms to form a mixture of distorted corner and edge-sharing OMg2Sb2 tetrahedra.