Materials Data on Mn7BiO12 by Materials Project

Abstract

BiMn7O12 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are five inequivalent Mn3+ sites. In the first Mn3+ site, Mn3+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Mn–O bond lengths are 1.97 Å. In the second Mn3+ site, Mn3+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Mn–O bond lengths are 1.96 Å. In the third Mn3+ site, Mn3+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.97 Å) and two longer (1.98 Å) Mn–O bond length. In the fourth Mn3+ site, Mn3+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with six MnO6 octahedra and faces with two equivalent BiO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 41–42°. There are a spread of Mn–O bond distances ranging from 2.02–2.04 Å. In the fifth Mn3+ site, Mn3+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with six MnO6 octahedra and faces with two equivalent BiO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 41–42°. There are a spread of Mn–O bond distances ranging from 2.01–2.05 Å. Bi3+ is bonded to twelve O2- atoms to form BiO12 cuboctahedra that share faces with eight MnO6 octahedra. There are a spread of Bi–O bond distances ranging from 2.68–2.71 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to three Mn3+ and one Bi3+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to three Mn3+ and one Bi3+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to three Mn3+ and one Bi3+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to three Mn3+ and one Bi3+ atom.