Materials Data on BaMn2O5 by Materials Project
BaMn2O5 crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Ba2+ is bonded to twelve O2- atoms to form BaO12 cuboctahedra that share corners with four equivalent BaO12 cuboctahedra, corners with four equivalent MnO6 octahedra, faces with four equivalent BaO12 cuboctahedra, and faces with eight equivalent MnO6 octahedra. The corner-sharing octahedral tilt angles are 41°. There are a spread of Ba–O bond distances ranging from 2.73–2.92 Å. Mn4+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with two equivalent BaO12 cuboctahedra, corners with five equivalent MnO6 octahedra, edges with two equivalent MnO6 octahedra, and faces with four equivalent BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–14°. There are a spread of Mn–O bond distances ranging from 1.92–2.09 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to four equivalent Ba2+ and two equivalent Mn4+ atoms. In the second O2- site, O2- is bonded in a distorted T-shaped geometry to two equivalent Ba2+ and three equivalent Mn4+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ba2+ and two equivalent Mn4+ atoms.