Cs2Al(TeO4)3 crystallizes in the trigonal R-3m space group. Cs(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted CsO6 octahedra that share corners with three equivalent Al(1)O6 octahedra and corners with nine equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 66-72°. Al(1) is bonded to six equivalent O(1) atoms to form AlO6 octahedra that share corners with six equivalent Cs(1)O6 octahedra and corners with six equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-66°. Te(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form TeO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with four equivalent Te(1)O6 octahedra, and corners with six equivalent Cs(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-72°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Cs(1), one Al(1), and one Te(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Cs(1) and two equivalent Te(1) atoms.
Cs2Al(TeO4)3 crystallizes in the trigonal R-3m space group. Cs(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted CsO6 octahedra that share corners with three equivalent Al(1)O6 octahedra and corners with nine equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 66-72°. All Cs(1)-O(1) bond lengths are 3.12 Å. All Cs(1)-O(2) bond lengths are 3.09 Å. Al(1) is bonded to six equivalent O(1) atoms to form AlO6 octahedra that share corners with six equivalent Cs(1)O6 octahedra and corners with six equivalent Te(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-66°. All Al(1)-O(1) bond lengths are 1.91 Å. Te(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form TeO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with four equivalent Te(1)O6 octahedra, and corners with six equivalent Cs(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-72°. Both Te(1)-O(1) bond lengths are 1.90 Å. All Te(1)-O(2) bond lengths are 1.99 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Cs(1), one Al(1), and one Te(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Cs(1) and two equivalent Te(1) atoms.