Materials Data on Mn5(AsO8)2 by Materials Project

Abstract

Mn5(AsO8)2 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two Mn5(AsO8)2 sheets oriented in the (0, 1, 0) direction. there are three inequivalent Mn+4.40+ sites. In the first Mn+4.40+ site, Mn+4.40+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with two equivalent AsO4 tetrahedra and edges with six MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.94–2.02 Å. In the second Mn+4.40+ site, Mn+4.40+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with three equivalent AsO4 tetrahedra and edges with five MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.90–2.39 Å. In the third Mn+4.40+ site, Mn+4.40+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with two equivalent AsO4 tetrahedra and edges with three MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 1.83–2.04 Å. As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with six MnO6 octahedra. The corner-sharing octahedra tilt angles range from 43–65°. There are a spread of As–O bond distances ranging from 1.68–1.84 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal non-coplanar geometry to three Mn+4.40+ atoms. In the second O2- site, O2- is bonded in a water-like geometry to two Mn+4.40+ atoms. In the third O2- site, O2- is bonded in a single-bond geometry to one Mn+4.40+ atom. In the fourth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Mn+4.40+ and one As5+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mn+4.40+ and one As5+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Mn+4.40+ and one As5+ atom. In the seventh O2- site, O2- is bonded in a single-bond geometry to one As5+ atom. In the eighth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Mn+4.40+ atoms.