Materials Data on Cs2Al(TeO4)3 by Materials Project
Cs2Al(TeO4)3 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Cs is bonded to six O atoms to form distorted CsO6 octahedra that share corners with three equivalent AlO6 octahedra and corners with nine equivalent TeO6 octahedra. The corner-sharing octahedra tilt angles range from 66–72°. There are three shorter (3.09 Å) and three longer (3.12 Å) Cs–O bond lengths. Al is bonded to six equivalent O atoms to form AlO6 octahedra that share corners with six equivalent CsO6 octahedra and corners with six equivalent TeO6 octahedra. The corner-sharing octahedra tilt angles range from 42–66°. All Al–O bond lengths are 1.91 Å. Te is bonded to six O atoms to form TeO6 octahedra that share corners with two equivalent AlO6 octahedra, corners with four equivalent TeO6 octahedra, and corners with six equivalent CsO6 octahedra. The corner-sharing octahedra tilt angles range from 42–72°. There is two shorter (1.90 Å) and four longer (1.99 Å) Te–O bond length. There are two inequivalent O sites. In the first O site, O is bonded in a distorted bent 150 degrees geometry to one Cs, one Al, and one Te atom. In the second O site, O is bonded in a 2-coordinate geometry to one Cs and two equivalent Te atoms.