Materials Data on Mn2CrO4 by Materials Project

Mn2CrO4 is Spinel-like structured and crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Cr4+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with six equivalent MnO4 tetrahedra, edges with two equivalent CrO6 octahedra, and edges with four equivalent MnO6 octahedra. There are a spread of Cr–O bond distances ranging from 2.03–2.06 Å. 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 MnO4 tetrahedra, edges with two equivalent MnO6 octahedra, and edges with four equivalent CrO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.95–2.24 Å. In the second Mn2+ site, Mn2+ is bonded to four O2- atoms to form MnO4 tetrahedra that share corners with six equivalent CrO6 octahedra and corners with six equivalent MnO6 octahedra. The corner-sharing octahedra tilt angles range from 54–63°. There are two shorter (2.05 Å) and two longer (2.10 Å) Mn–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Cr4+ and two Mn2+ atoms. In the second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Cr4+ and three Mn2+ atoms.