Ge(SbTe2)2 is Caswellsilverite-like structured and crystallizes in the trigonal R-3m space group. Ge(1) is bonded to six equivalent Te(2) atoms to form GeTe6 octahedra that share corners with six equivalent Te(1)Sb3Te3 octahedra, edges with six equivalent Ge(1)Te6 octahedra, and edges with six equivalent Te(1)Sb3Te3 octahedra. The corner-sharing octahedral tilt angles are 7°. Sb(1) is bonded to three equivalent Sb(1) and three equivalent Te(1) atoms to form SbSb3Te3 octahedra that share corners with three equivalent Te(2)Ge3Te3 octahedra, corners with three equivalent Te(1)Sb3Te3 octahedra, edges with three equivalent Te(2)Ge3Te3 octahedra, edges with three equivalent Te(1)Sb3Te3 octahedra, and edges with six equivalent Sb(1)Sb3Te3 octahedra. The corner-sharing octahedral tilt angles range from 5-6°. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to three equivalent Sb(1) and three equivalent Te(2) atoms to form TeSb3Te3 octahedra that share corners with three equivalent Ge(1)Te6 octahedra, corners with three equivalent Sb(1)Sb3Te3 octahedra, edges with three equivalent Ge(1)Te6 octahedra, edges with three equivalent Sb(1)Sb3Te3 octahedra, and edges with six equivalent Te(1)Sb3Te3 octahedra. The corner-sharing octahedral tilt angles range from 5-7°. In the second Te site, Te(2) is bonded to three equivalent Ge(1) and three equivalent Te(1) atoms to form distorted TeGe3Te3 octahedra that share corners with three equivalent Sb(1)Sb3Te3 octahedra, corners with three equivalent Te(2)Ge3Te3 octahedra, edges with three equivalent Sb(1)Sb3Te3 octahedra, and edges with nine equivalent Te(2)Ge3Te3 octahedra. The corner-sharing octahedral tilt angles range from 0-6°.
Ge(SbTe2)2 is Caswellsilverite-like structured and crystallizes in the trigonal R-3m space group. Ge(1) is bonded to six equivalent Te(2) atoms to form GeTe6 octahedra that share corners with six equivalent Te(1)Sb3Te3 octahedra, edges with six equivalent Ge(1)Te6 octahedra, and edges with six equivalent Te(1)Sb3Te3 octahedra. The corner-sharing octahedral tilt angles are 7°. All Ge(1)-Te(2) bond lengths are 3.01 Å. Sb(1) is bonded to three equivalent Sb(1) and three equivalent Te(1) atoms to form SbSb3Te3 octahedra that share corners with three equivalent Te(2)Ge3Te3 octahedra, corners with three equivalent Te(1)Sb3Te3 octahedra, edges with three equivalent Te(2)Ge3Te3 octahedra, edges with three equivalent Te(1)Sb3Te3 octahedra, and edges with six equivalent Sb(1)Sb3Te3 octahedra. The corner-sharing octahedral tilt angles range from 5-6°. All Sb(1)-Sb(1) bond lengths are 3.24 Å. All Sb(1)-Te(1) bond lengths are 3.03 Å. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to three equivalent Sb(1) and three equivalent Te(2) atoms to form TeSb3Te3 octahedra that share corners with three equivalent Ge(1)Te6 octahedra, corners with three equivalent Sb(1)Sb3Te3 octahedra, edges with three equivalent Ge(1)Te6 octahedra, edges with three equivalent Sb(1)Sb3Te3 octahedra, and edges with six equivalent Te(1)Sb3Te3 octahedra. The corner-sharing octahedral tilt angles range from 5-7°. All Te(1)-Te(2) bond lengths are 3.31 Å. In the second Te site, Te(2) is bonded to three equivalent Ge(1) and three equivalent Te(1) atoms to form distorted TeGe3Te3 octahedra that share corners with three equivalent Sb(1)Sb3Te3 octahedra, corners with three equivalent Te(2)Ge3Te3 octahedra, edges with three equivalent Sb(1)Sb3Te3 octahedra, and edges with nine equivalent Te(2)Ge3Te3 octahedra. The corner-sharing octahedral tilt angles range from 0-6°.