Pa3Sb4 crystallizes in the trigonal R3c space group. Pa(1) is bonded to two equivalent Sb(2) and six equivalent Sb(1) atoms to form a mixture of distorted face, corner, and edge-sharing PaSb8 hexagonal bipyramids. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to six equivalent Pa(1) atoms to form a mixture of distorted face, corner, and edge-sharing SbPa6 octahedra. The corner-sharing octahedral tilt angles range from 15-51°. In the second Sb site, Sb(2) is bonded to six equivalent Pa(1) atoms to form a mixture of distorted face, corner, and edge-sharing SbPa6 octahedra. The corner-sharing octahedral tilt angles range from 15-51°.
Pa3Sb4 crystallizes in the trigonal R3c space group. Pa(1) is bonded to two equivalent Sb(2) and six equivalent Sb(1) atoms to form a mixture of distorted face, corner, and edge-sharing PaSb8 hexagonal bipyramids. There is one shorter (3.15 Å) and one longer (3.24 Å) Pa(1)-Sb(2) bond length. There are a spread of Pa(1)-Sb(1) bond distances ranging from 3.16-3.27 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to six equivalent Pa(1) atoms to form a mixture of distorted face, corner, and edge-sharing SbPa6 octahedra. The corner-sharing octahedral tilt angles range from 15-51°. In the second Sb site, Sb(2) is bonded to six equivalent Pa(1) atoms to form a mixture of distorted face, corner, and edge-sharing SbPa6 octahedra. The corner-sharing octahedral tilt angles range from 15-51°.