Materials Data on CaTmMn2O6 by Materials Project

Abstract

CaTmMn2O6 is Orthorhombic Perovskite-derived structured and crystallizes in the orthorhombic Pmc2_1 space group. The structure is three-dimensional. Ca2+ is bonded in a 4-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.31–2.75 Å. Tm3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Tm–O bond distances ranging from 2.25–2.52 Å. Mn+3.50+ is bonded to six O2- atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 30–34°. There are a spread of Mn–O bond distances ranging from 1.95–2.03 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Tm3+ and two equivalent Mn+3.50+ atoms to form distorted OTm2Mn2 trigonal pyramids that share corners with two equivalent OCa2Mn2 tetrahedra and corners with two equivalent OTm2Mn2 trigonal pyramids. In the second O2- site, O2- is bonded to two equivalent Ca2+ and two equivalent Mn+3.50+ atoms to form distorted OCa2Mn2 tetrahedra that share corners with two equivalent OCa2Mn2 tetrahedra and corners with two equivalent OTm2Mn2 trigonal pyramids. In the third O2- site, O2- is bonded in a 5-coordinate geometry to one Ca2+, two equivalent Tm3+, and two equivalent Mn+3.50+ atoms. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ca2+, one Tm3+, and two equivalent Mn+3.50+ atoms.