DOI: 10.17188/1700132
title: Materials Data on MgMn4O8 by Materials Project

description: MgMn4O8 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are two inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded to five O2- atoms to form MgO5 square pyramids that share corners with six MnO6 octahedra, edges with three MnO6 octahedra, and a faceface with one MnO6 octahedra. The corner-sharing octahedra tilt angles range from 12–53°. There are a spread of Mg–O bond distances ranging from 2.03–2.14 Å. In the second Mg2+ site, Mg2+ is bonded to five O2- atoms to form MgO5 square pyramids that share corners with six MnO6 octahedra, edges with three MnO6 octahedra, and a faceface with one MnO6 octahedra. The corner-sharing octahedra tilt angles range from 13–53°. There are a spread of Mg–O bond distances ranging from 2.03–2.14 Å. There are eight inequivalent Mn+3.50+ sites. In the first Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four MnO6 octahedra, edges with four MnO6 octahedra, and edges with two MgO5 square pyramids. The corner-sharing octahedra tilt angles range from 48–56°. There are a spread of Mn–O bond distances ranging from 1.90–2.07 Å. In the second Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four MnO6 octahedra, corners with two equivalent MgO5 square pyramids, edges with four MnO6 octahedra, and an edgeedge with one MgO5 square pyramid. The corner-sharing octahedra tilt angles range from 49–56°. There are a spread of Mn–O bond distances ranging from 1.92–2.18 Å. In the third Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with four MnO6 octahedra, corners with three MgO5 square pyramids, and edges with four MnO6 octahedra. The corner-sharing octahedra tilt angles range from 50–56°. There are a spread of Mn–O bond distances ranging from 1.93–2.24 Å. In the fourth Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four MnO6 octahedra, a cornercorner with one MgO5 square pyramid, edges with four MnO6 octahedra, and a faceface with one MgO5 square pyramid. The corner-sharing octahedra tilt angles range from 48–56°. There are a spread of Mn–O bond distances ranging from 1.90–2.01 Å. In the fifth Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four MnO6 octahedra, edges with four MnO6 octahedra, and edges with two MgO5 square pyramids. The corner-sharing octahedra tilt angles range from 48–56°. There are a spread of Mn–O bond distances ranging from 1.90–2.07 Å. In the sixth Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four MnO6 octahedra, corners with two equivalent MgO5 square pyramids, edges with four MnO6 octahedra, and an edgeedge with one MgO5 square pyramid. The corner-sharing octahedra tilt angles range from 49–56°. There are a spread of Mn–O bond distances ranging from 1.92–2.18 Å. In the seventh Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with four MnO6 octahedra, corners with three MgO5 square pyramids, and edges with four MnO6 octahedra. The corner-sharing octahedra tilt angles range from 50–56°. There are a spread of Mn–O bond distances ranging from 1.93–2.24 Å. In the eighth Mn+3.50+ site, Mn+3.50+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four MnO6 octahedra, a cornercorner with one MgO5 square pyramid, edges with four MnO6 octahedra, and a faceface with one MgO5 square pyramid. The corner-sharing octahedra tilt angles range from 48–56°. There are a spread of Mn–O bond distances ranging from 1.90–2.01 Å. There are sixteen inequivalent O2- sites. In the first O2- site, O2- is bonded to one Mg2+ and three Mn+3.50+ atoms to form a mixture of edge and corner-sharing OMgMn3 trigonal pyramids. In the second O2- site, O2- is bonded in a trigonal planar geometry to three Mn+3.50+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn+3.50+ atoms. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to three Mn+3.50+ atoms. In the fifth O2- site, O2- is bonded in a trigonal planar geometry to three Mn+3.50+ atoms. In the sixth O2- site, O2- is bonded to one Mg2+ and three Mn+3.50+ atoms to form a mixture of edge and corner-sharing OMgMn3 trigonal pyramids. In the seventh O2- site, O2- is bonded in a trigonal planar geometry to three Mn+3.50+ atoms. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn+3.50+ atoms. In the ninth O2- site, O2- is bonded to one Mg2+ and three Mn+3.50+ atoms to form a mixture of distorted edge and corner-sharing OMgMn3 trigonal pyramids. In the tenth O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Mg2+ and three Mn+3.50+ atoms. In the eleventh O2- site, O2- is bonded to one Mg2+ and three Mn+3.50+ atoms to form a mixture of distorted edge and corner-sharing OMgMn3 trigonal pyramids. In the twelfth O2- site, O2- is bonded to one Mg2+ and three Mn+3.50+ atoms to form a mixture of distorted edge and corner-sharing OMgMn3 trigonal pyramids. In the thirteenth O2- site, O2- is bonded to one Mg2+ and three Mn+3.50+ atoms to form a mixture of distorted edge and corner-sharing OMgMn3 trigonal pyramids. In the fourteenth O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Mg2+ and three Mn+3.50+ atoms. In the fifteenth O2- site, O2- is bonded to one Mg2+ and three Mn+3.50+ atoms to form a mixture of distorted edge and corner-sharing OMgMn3 trigonal pyramids. In the sixteenth O2- site, O2- is bonded to one Mg2+ and three Mn+3.50+ atoms to form a mixture of distorted edge and corner-sharing OMgMn3 trigonal pyramids.