Materials Data on Sr2CaTeO6 by Materials Project

Abstract

Sr2CaTeO6 is Orthorhombic Perovskite-derived structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Sr2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Sr–O bond distances ranging from 2.54–2.95 Å. Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with six equivalent TeO6 octahedra. The corner-sharing octahedra tilt angles range from 25–28°. There are four shorter (2.31 Å) and two longer (2.33 Å) Ca–O bond lengths. Te6+ is bonded to six O2- atoms to form TeO6 octahedra that share corners with six equivalent CaO6 octahedra. The corner-sharing octahedra tilt angles range from 25–28°. All Te–O bond lengths are 1.96 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Sr2+, one Ca2+, and one Te6+ atom to form distorted corner-sharing OSr2CaTe tetrahedra. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Sr2+, one Ca2+, and one Te6+ atom. In the third O2- site, O2- is bonded in a 5-coordinate geometry to three equivalent Sr2+, one Ca2+, and one Te6+ atom.