Materials Data on U2CS by Materials Project
U2CS is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. U3+ is bonded to three equivalent C4- and three equivalent S2- atoms to form a mixture of edge and corner-sharing UC3S3 octahedra. The corner-sharing octahedral tilt angles are 0°. All U–C bond lengths are 2.50 Å. All U–S bond lengths are 2.76 Å. C4- is bonded to six equivalent U3+ atoms to form CU6 octahedra that share corners with six equivalent SU6 octahedra, edges with six equivalent CU6 octahedra, and edges with six equivalent SU6 octahedra. The corner-sharing octahedral tilt angles are 8°. S2- is bonded to six equivalent U3+ atoms to form SU6 octahedra that share corners with six equivalent CU6 octahedra, edges with six equivalent CU6 octahedra, and edges with six equivalent SU6 octahedra. The corner-sharing octahedral tilt angles are 8°.