Materials Data on Ba2Mn2O5 by Materials Project
Ba2Mn2O5 crystallizes in the orthorhombic Ima2 space group. The structure is three-dimensional. Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.73–3.36 Å. There are two inequivalent Mn3+ sites. In the first Mn3+ site, Mn3+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four equivalent MnO6 octahedra and corners with two equivalent MnO4 tetrahedra. The corner-sharing octahedral tilt angles are 4°. There are four shorter (2.06 Å) and two longer (2.36 Å) Mn–O bond lengths. In the second Mn3+ site, Mn3+ is bonded to four O2- atoms to form distorted MnO4 tetrahedra that share corners with two equivalent MnO6 octahedra and corners with two equivalent MnO4 tetrahedra. The corner-sharing octahedral tilt angles are 22°. There is three shorter (1.88 Å) and one longer (1.93 Å) Mn–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Ba2+ and two equivalent Mn3+ atoms to form a mixture of distorted edge, face, and corner-sharing OBa4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the second O2- site, O2- is bonded in a 1-coordinate geometry to four equivalent Ba2+ and two Mn3+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to four equivalent Ba2+ and two equivalent Mn3+ atoms.