Pa3Sb is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Pa(1) is bonded to eight equivalent Pa(1) and four equivalent Sb(1) atoms to form distorted PaPa8Sb4 cuboctahedra that share corners with twelve equivalent Pa(1)Pa8Sb4 cuboctahedra, edges with eight equivalent Sb(1)Pa12 cuboctahedra, edges with sixteen equivalent Pa(1)Pa8Sb4 cuboctahedra, faces with four equivalent Sb(1)Pa12 cuboctahedra, and faces with fourteen equivalent Pa(1)Pa8Sb4 cuboctahedra. Sb(1) is bonded to twelve equivalent Pa(1) atoms to form SbPa12 cuboctahedra that share corners with twelve equivalent Sb(1)Pa12 cuboctahedra, edges with twenty-four equivalent Pa(1)Pa8Sb4 cuboctahedra, faces with six equivalent Sb(1)Pa12 cuboctahedra, and faces with twelve equivalent Pa(1)Pa8Sb4 cuboctahedra.
Pa3Sb is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Pa(1) is bonded to eight equivalent Pa(1) and four equivalent Sb(1) atoms to form distorted PaPa8Sb4 cuboctahedra that share corners with twelve equivalent Pa(1)Pa8Sb4 cuboctahedra, edges with eight equivalent Sb(1)Pa12 cuboctahedra, edges with sixteen equivalent Pa(1)Pa8Sb4 cuboctahedra, faces with four equivalent Sb(1)Pa12 cuboctahedra, and faces with fourteen equivalent Pa(1)Pa8Sb4 cuboctahedra. All Pa(1)-Pa(1) bond lengths are 3.25 Å. All Pa(1)-Sb(1) bond lengths are 3.25 Å. Sb(1) is bonded to twelve equivalent Pa(1) atoms to form SbPa12 cuboctahedra that share corners with twelve equivalent Sb(1)Pa12 cuboctahedra, edges with twenty-four equivalent Pa(1)Pa8Sb4 cuboctahedra, faces with six equivalent Sb(1)Pa12 cuboctahedra, and faces with twelve equivalent Pa(1)Pa8Sb4 cuboctahedra.