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DOE OSTI2020

Materials Data on MgMnO3 by Materials Project

MgMnO3 is Orthorhombic Perovskite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Mg2+ is bonded in a 4-coordinate geometry to eight O2- atoms. There are a spread of Mg–O bond distances ranging from 2.06–2.62 Å. Mn4+ is bonded to six O2- atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 40–42°. There are a spread of Mn–O bond distances ranging from 1.92–1.96 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Mg2+ and two equivalent Mn4+ atoms to form distorted corner-sharing OMg2Mn2 trigonal pyramids. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Mg2+ and two equivalent Mn4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgMnO3 by Materials Project

MgMnO3 is Ilmenite structured and crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Mg2+ is bonded to six equivalent O2- atoms to form distorted MgO6 octahedra that share corners with nine equivalent MnO6 octahedra, edges with three equivalent MgO6 octahedra, and a faceface with one MnO6 octahedra. The corner-sharing octahedra tilt angles range from 42–60°. There are three shorter (2.03 Å) and three longer (2.20 Å) Mg–O bond lengths. Mn4+ is bonded to six equivalent O2- atoms to form MnO6 octahedra that share corners with nine equivalent MgO6 octahedra, edges with three equivalent MnO6 octahedra, and a faceface with one MgO6 octahedra. The corner-sharing octahedra tilt angles range from 42–60°. There is three shorter (1.93 Å) and three longer (1.95 Å) Mn–O bond length. O2- is bonded in a distorted see-saw-like geometry to two equivalent Mg2+ and two equivalent Mn4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgMnO3 by Materials Project

MgMnO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mg2+ is bonded to twelve equivalent O2- atoms to form MgO12 cuboctahedra that share corners with twelve equivalent MgO12 cuboctahedra, faces with six equivalent MgO12 cuboctahedra, and faces with eight equivalent MnO6 octahedra. All Mg–O bond lengths are 2.64 Å. Mn4+ is bonded to six equivalent O2- atoms to form MnO6 octahedra that share corners with six equivalent MnO6 octahedra and faces with eight equivalent MgO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Mn–O bond lengths are 1.87 Å. O2- is bonded in a distorted linear geometry to four equivalent Mg2+ and two equivalent Mn4+ atoms.

36 MATERIALS SCIENCE↗