Materials Data on HfUC2 by Materials Project
UHfC2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. U4+ is bonded to six equivalent C4- atoms to form UC6 octahedra that share corners with six equivalent HfC6 octahedra, edges with six equivalent UC6 octahedra, and edges with six equivalent HfC6 octahedra. The corner-sharing octahedral tilt angles are 2°. All U–C bond lengths are 2.42 Å. Hf4+ is bonded to six equivalent C4- atoms to form HfC6 octahedra that share corners with six equivalent UC6 octahedra, edges with six equivalent UC6 octahedra, and edges with six equivalent HfC6 octahedra. The corner-sharing octahedral tilt angles are 2°. All Hf–C bond lengths are 2.38 Å. C4- is bonded to three equivalent U4+ and three equivalent Hf4+ atoms to form a mixture of edge and corner-sharing CHf3U3 octahedra. The corner-sharing octahedral tilt angles are 0°.