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USb is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. U3+ is bonded in a body-centered cubic geometry to eight equivalent Sb3- atoms. All U–Sb bond lengths are 3.23 Å. Sb3- is bonded in a body-centered cubic geometry to eight equivalent U3+ atoms.
USb2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. U6+ is bonded in a 9-coordinate geometry to nine Sb3- atoms. There are a spread of U–Sb bond distances ranging from 3.12–3.26 Å. There are two inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded in a 8-coordinate geometry to four equivalent U6+ and four equivalent Sb3- atoms. All Sb–Sb bond lengths are 3.05 Å. In the second Sb3- site, Sb3- is bonded to five equivalent U6+ atoms to form a mixture of edge and corner-sharing SbU5 square pyramids.
U3Sb4 crystallizes in the cubic I-43d space group. The structure is three-dimensional. U4+ is bonded to eight equivalent Sb3- atoms to form a mixture of distorted edge, face, and corner-sharing USb8 hexagonal bipyramids. There are four shorter (3.11 Å) and four longer (3.19 Å) U–Sb bond lengths. Sb3- is bonded to six equivalent U4+ atoms to form a mixture of distorted edge, face, and corner-sharing SbU6 octahedra. The corner-sharing octahedra tilt angles range from 15–51°.
USb is Halite, Rock Salt structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. U3+ is bonded to six equivalent Sb3- atoms to form a mixture of corner and edge-sharing USb6 octahedra. The corner-sharing octahedral tilt angles are 0°. All U–Sb bond lengths are 3.10 Å. Sb3- is bonded to six equivalent U3+ atoms to form a mixture of corner and edge-sharing SbU6 octahedra. The corner-sharing octahedral tilt angles are 0°.