SrCd4S5 is Caswellsilverite-like structured and crystallizes in the trigonal R-3m space group. Sr(1) is bonded to six equivalent S(1) atoms to form SrS6 octahedra that share corners with six equivalent Cd(1)S6 octahedra, edges with six equivalent Sr(1)S6 octahedra, and edges with six equivalent Cd(1)S6 octahedra. The corner-sharing octahedral tilt angles are 5°. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to three equivalent S(1) and three equivalent S(3) atoms to form CdS6 octahedra that share corners with three equivalent Sr(1)S6 octahedra, corners with three equivalent Cd(2)S6 octahedra, edges with three equivalent Sr(1)S6 octahedra, edges with three equivalent Cd(2)S6 octahedra, and edges with six equivalent Cd(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the second Cd site, Cd(2) is bonded to three equivalent S(2) and three equivalent S(3) atoms to form a mixture of corner and edge-sharing CdS6 octahedra. The corner-sharing octahedra are not tilted. There are three inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Sr(1) and three equivalent Cd(1) atoms to form SSr3Cd3 octahedra that share corners with three equivalent S(3)Cd6 octahedra, corners with three equivalent S(1)Sr3Cd3 octahedra, edges with three equivalent S(3)Cd6 octahedra, and edges with nine equivalent S(1)Sr3Cd3 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second S site, S(2) is bonded to six equivalent Cd(2) atoms to form a mixture of corner and edge-sharing SCd6 octahedra. The corner-sharing octahedra are not tilted. In the third S site, S(3) is bonded to three equivalent Cd(1) and three equivalent Cd(2) atoms to form SCd6 octahedra that share corners with three equivalent S(2)Cd6 octahedra, corners with three equivalent S(1)Sr3Cd3 octahedra, edges with three equivalent S(2)Cd6 octahedra, edges with three equivalent S(1)Sr3Cd3 octahedra, and edges with six equivalent S(3)Cd6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°.
SrCd4S5 is Caswellsilverite-like structured and crystallizes in the trigonal R-3m space group. Sr(1) is bonded to six equivalent S(1) atoms to form SrS6 octahedra that share corners with six equivalent Cd(1)S6 octahedra, edges with six equivalent Sr(1)S6 octahedra, and edges with six equivalent Cd(1)S6 octahedra. The corner-sharing octahedral tilt angles are 5°. All Sr(1)-S(1) bond lengths are 2.95 Å. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to three equivalent S(1) and three equivalent S(3) atoms to form CdS6 octahedra that share corners with three equivalent Sr(1)S6 octahedra, corners with three equivalent Cd(2)S6 octahedra, edges with three equivalent Sr(1)S6 octahedra, edges with three equivalent Cd(2)S6 octahedra, and edges with six equivalent Cd(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. All Cd(1)-S(1) bond lengths are 2.76 Å. All Cd(1)-S(3) bond lengths are 2.78 Å. In the second Cd site, Cd(2) is bonded to three equivalent S(2) and three equivalent S(3) atoms to form a mixture of corner and edge-sharing CdS6 octahedra. The corner-sharing octahedra are not tilted. All Cd(2)-S(2) bond lengths are 2.78 Å. All Cd(2)-S(3) bond lengths are 2.78 Å. There are three inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Sr(1) and three equivalent Cd(1) atoms to form SSr3Cd3 octahedra that share corners with three equivalent S(3)Cd6 octahedra, corners with three equivalent S(1)Sr3Cd3 octahedra, edges with three equivalent S(3)Cd6 octahedra, and edges with nine equivalent S(1)Sr3Cd3 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second S site, S(2) is bonded to six equivalent Cd(2) atoms to form a mixture of corner and edge-sharing SCd6 octahedra. The corner-sharing octahedra are not tilted. In the third S site, S(3) is bonded to three equivalent Cd(1) and three equivalent Cd(2) atoms to form SCd6 octahedra that share corners with three equivalent S(2)Cd6 octahedra, corners with three equivalent S(1)Sr3Cd3 octahedra, edges with three equivalent S(2)Cd6 octahedra, edges with three equivalent S(1)Sr3Cd3 octahedra, and edges with six equivalent S(3)Cd6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°.