Materials Data on Mg2Bi3O8 by Materials Project
Mg2Bi3O8 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Mg2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Mg–O bond distances ranging from 2.12–2.57 Å. There are two inequivalent Bi4+ sites. In the first Bi4+ site, Bi4+ is bonded to six O2- atoms to form edge-sharing BiO6 octahedra. There are four shorter (2.37 Å) and two longer (2.44 Å) Bi–O bond lengths. In the second Bi4+ site, Bi4+ is bonded to six O2- atoms to form edge-sharing BiO6 octahedra. There are a spread of Bi–O bond distances ranging from 2.18–2.28 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted T-shaped geometry to one Mg2+ and two equivalent Bi4+ atoms. In the second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Mg2+ and three Bi4+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Mg2+ and two Bi4+ atoms.