SmYS2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Sm(1) is bonded to six equivalent S(1) atoms to form SmS6 octahedra that share corners with six equivalent Y(1)S6 octahedra, edges with six equivalent Sm(1)S6 octahedra, and edges with six equivalent Y(1)S6 octahedra. The corner-sharing octahedral tilt angles are 2°. Y(1) is bonded to six equivalent S(1) atoms to form YS6 octahedra that share corners with six equivalent Sm(1)S6 octahedra, edges with six equivalent Sm(1)S6 octahedra, and edges with six equivalent Y(1)S6 octahedra. The corner-sharing octahedral tilt angles are 2°. S(1) is bonded to three equivalent Sm(1) and three equivalent Y(1) atoms to form a mixture of edge and corner-sharing SSm3Y3 octahedra. The corner-sharing octahedra are not tilted.
SmYS2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Sm(1) is bonded to six equivalent S(1) atoms to form SmS6 octahedra that share corners with six equivalent Y(1)S6 octahedra, edges with six equivalent Sm(1)S6 octahedra, and edges with six equivalent Y(1)S6 octahedra. The corner-sharing octahedral tilt angles are 2°. All Sm(1)-S(1) bond lengths are 2.84 Å. Y(1) is bonded to six equivalent S(1) atoms to form YS6 octahedra that share corners with six equivalent Sm(1)S6 octahedra, edges with six equivalent Sm(1)S6 octahedra, and edges with six equivalent Y(1)S6 octahedra. The corner-sharing octahedral tilt angles are 2°. All Y(1)-S(1) bond lengths are 2.76 Å. S(1) is bonded to three equivalent Sm(1) and three equivalent Y(1) atoms to form a mixture of edge and corner-sharing SSm3Y3 octahedra. The corner-sharing octahedra are not tilted.