Materials Data on Mn7BiO12 by Materials Project

Abstract

BiMn7O12 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are five inequivalent Mn3+ sites. In the first Mn3+ site, Mn3+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Mn–O bond distances ranging from 1.96–2.00 Å. In the second Mn3+ site, Mn3+ is bonded in a square co-planar geometry to four O2- atoms. All Mn–O bond lengths are 1.96 Å. In the third Mn3+ site, Mn3+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There is two shorter (1.95 Å) and two longer (1.97 Å) Mn–O bond length. In the fourth Mn3+ site, Mn3+ is bonded to six O2- atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 40–48°. There are a spread of Mn–O bond distances ranging from 1.94–2.15 Å. In the fifth Mn3+ site, Mn3+ is bonded to six O2- atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 40–44°. There are a spread of Mn–O bond distances ranging from 1.95–2.15 Å. Bi3+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Bi–O bond distances ranging from 2.36–3.02 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn3+ and one Bi3+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn3+ and one Bi3+ atom. In the third O2- site, O2- is bonded in a distorted tetrahedral geometry to three Mn3+ and one Bi3+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn3+ and one Bi3+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to three Mn3+ and one Bi3+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to three Mn3+ and one Bi3+ atom. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to three Mn3+ and one Bi3+ atom. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn3+ and one Bi3+ atom.