AgSnSe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Ag(1) is bonded to six equivalent Se(1) atoms to form AgSe6 octahedra that share corners with six equivalent Sn(1)Se6 octahedra, edges with six equivalent Ag(1)Se6 octahedra, and edges with six equivalent Sn(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 1°. Sn(1) is bonded to six equivalent Se(1) atoms to form SnSe6 octahedra that share corners with six equivalent Ag(1)Se6 octahedra, edges with six equivalent Ag(1)Se6 octahedra, and edges with six equivalent Sn(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 1°. Se(1) is bonded to three equivalent Ag(1) and three equivalent Sn(1) atoms to form a mixture of edge and corner-sharing SeAg3Sn3 octahedra. The corner-sharing octahedra are not tilted.
AgSnSe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Ag(1) is bonded to six equivalent Se(1) atoms to form AgSe6 octahedra that share corners with six equivalent Sn(1)Se6 octahedra, edges with six equivalent Ag(1)Se6 octahedra, and edges with six equivalent Sn(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 1°. All Ag(1)-Se(1) bond lengths are 2.82 Å. Sn(1) is bonded to six equivalent Se(1) atoms to form SnSe6 octahedra that share corners with six equivalent Ag(1)Se6 octahedra, edges with six equivalent Ag(1)Se6 octahedra, and edges with six equivalent Sn(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 1°. All Sn(1)-Se(1) bond lengths are 2.87 Å. Se(1) is bonded to three equivalent Ag(1) and three equivalent Sn(1) atoms to form a mixture of edge and corner-sharing SeAg3Sn3 octahedra. The corner-sharing octahedra are not tilted.