TbTlTe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Tb(1) is bonded to six equivalent Te(1) atoms to form TbTe6 octahedra that share corners with six equivalent Tl(1)Te6 octahedra, edges with six equivalent Tb(1)Te6 octahedra, and edges with six equivalent Tl(1)Te6 octahedra. The corner-sharing octahedral tilt angles are 8°. Tl(1) is bonded to six equivalent Te(1) atoms to form TlTe6 octahedra that share corners with six equivalent Tb(1)Te6 octahedra, edges with six equivalent Tb(1)Te6 octahedra, and edges with six equivalent Tl(1)Te6 octahedra. The corner-sharing octahedral tilt angles are 8°. Te(1) is bonded to three equivalent Tb(1) and three equivalent Tl(1) atoms to form a mixture of distorted corner and edge-sharing TeTb3Tl3 octahedra. The corner-sharing octahedra are not tilted.
TbTlTe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Tb(1) is bonded to six equivalent Te(1) atoms to form TbTe6 octahedra that share corners with six equivalent Tl(1)Te6 octahedra, edges with six equivalent Tb(1)Te6 octahedra, and edges with six equivalent Tl(1)Te6 octahedra. The corner-sharing octahedral tilt angles are 8°. All Tb(1)-Te(1) bond lengths are 3.11 Å. Tl(1) is bonded to six equivalent Te(1) atoms to form TlTe6 octahedra that share corners with six equivalent Tb(1)Te6 octahedra, edges with six equivalent Tb(1)Te6 octahedra, and edges with six equivalent Tl(1)Te6 octahedra. The corner-sharing octahedral tilt angles are 8°. All Tl(1)-Te(1) bond lengths are 3.47 Å. Te(1) is bonded to three equivalent Tb(1) and three equivalent Tl(1) atoms to form a mixture of distorted corner and edge-sharing TeTb3Tl3 octahedra. The corner-sharing octahedra are not tilted.