Materials Data on Ca2TaCrO6 by Materials Project

Abstract

Ca2CrTaO6 is Orthorhombic Perovskite-derived structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.35–2.76 Å. Ta5+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with six equivalent CrO6 octahedra. The corner-sharing octahedra tilt angles range from 27–28°. There is two shorter (1.99 Å) and four longer (2.00 Å) Ta–O bond length. Cr3+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with six equivalent TaO6 octahedra. The corner-sharing octahedra tilt angles range from 27–28°. There are four shorter (2.02 Å) and two longer (2.03 Å) Cr–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Ca2+, one Ta5+, and one Cr3+ atom to form distorted corner-sharing OCa2TaCr tetrahedra. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Ca2+, one Ta5+, and one Cr3+ atom. In the third O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Ca2+, one Ta5+, and one Cr3+ atom.