Materials Data on MgGeO3 by Materials Project

Abstract

MgGeO3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Mg2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Mg–O bond distances ranging from 2.05–2.40 Å. Ge4+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing GeO6 octahedra. The corner-sharing octahedral tilt angles are 49°. There is two shorter (1.93 Å) and four longer (1.94 Å) Ge–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Mg2+ and two equivalent Ge4+ atoms. In the second O2- site, O2- is bonded to two equivalent Mg2+ and two equivalent Ge4+ atoms to form distorted corner-sharing OMg2Ge2 tetrahedra.