Materials Data on MnGeO3 by Materials Project

Abstract

MnGeO3 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Mn2+ sites. In the first Mn2+ site, Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with six equivalent GeO4 tetrahedra and edges with five MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 2.17–2.29 Å. In the second Mn2+ site, Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with eight equivalent GeO4 tetrahedra and edges with three equivalent MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 2.11–2.43 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with seven MnO6 octahedra and corners with two equivalent GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–66°. There are a spread of Ge–O bond distances ranging from 1.73–1.83 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to three Mn2+ and one Ge4+ atom to form a mixture of distorted edge and corner-sharing OMn3Ge trigonal pyramids. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mn2+ and one Ge4+ atom. In the third O2- site, O2- is bonded in a trigonal planar geometry to one Mn2+ and two equivalent Ge4+ atoms.