Pd3Rh is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Rh(1) is bonded to four equivalent Pd(2) and eight equivalent Pd(1) atoms to form RhPd12 cuboctahedra that share corners with four equivalent Rh(1)Pd12 cuboctahedra, corners with eight equivalent Pd(2)Pd8Rh4 cuboctahedra, edges with eight equivalent Rh(1)Pd12 cuboctahedra, edges with sixteen equivalent Pd(1)Pd8Rh4 cuboctahedra, faces with four equivalent Rh(1)Pd12 cuboctahedra, faces with six equivalent Pd(2)Pd8Rh4 cuboctahedra, and faces with eight equivalent Pd(1)Pd8Rh4 cuboctahedra. There are two inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to four equivalent Rh(1), four equivalent Pd(1), and four equivalent Pd(2) atoms to form PdPd8Rh4 cuboctahedra that share corners with twelve equivalent Pd(1)Pd8Rh4 cuboctahedra, edges with eight equivalent Rh(1)Pd12 cuboctahedra, edges with eight equivalent Pd(1)Pd8Rh4 cuboctahedra, edges with eight equivalent Pd(2)Pd8Rh4 cuboctahedra, faces with four equivalent Rh(1)Pd12 cuboctahedra, faces with four equivalent Pd(2)Pd8Rh4 cuboctahedra, and faces with ten equivalent Pd(1)Pd8Rh4 cuboctahedra. In the second Pd site, Pd(2) is bonded to four equivalent Rh(1) and eight equivalent Pd(1) atoms to form PdPd8Rh4 cuboctahedra that share corners with four equivalent Pd(2)Pd8Rh4 cuboctahedra, corners with eight equivalent Rh(1)Pd12 cuboctahedra, edges with eight equivalent Pd(2)Pd8Rh4 cuboctahedra, edges with sixteen equivalent Pd(1)Pd8Rh4 cuboctahedra, faces with four equivalent Pd(2)Pd8Rh4 cuboctahedra, faces with six equivalent Rh(1)Pd12 cuboctahedra, and faces with eight equivalent Pd(1)Pd8Rh4 cuboctahedra.
Pd3Rh is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Rh(1) is bonded to four equivalent Pd(2) and eight equivalent Pd(1) atoms to form RhPd12 cuboctahedra that share corners with four equivalent Rh(1)Pd12 cuboctahedra, corners with eight equivalent Pd(2)Pd8Rh4 cuboctahedra, edges with eight equivalent Rh(1)Pd12 cuboctahedra, edges with sixteen equivalent Pd(1)Pd8Rh4 cuboctahedra, faces with four equivalent Rh(1)Pd12 cuboctahedra, faces with six equivalent Pd(2)Pd8Rh4 cuboctahedra, and faces with eight equivalent Pd(1)Pd8Rh4 cuboctahedra. All Rh(1)-Pd(2) bond lengths are 2.74 Å. All Rh(1)-Pd(1) bond lengths are 2.76 Å. There are two inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to four equivalent Rh(1), four equivalent Pd(1), and four equivalent Pd(2) atoms to form PdPd8Rh4 cuboctahedra that share corners with twelve equivalent Pd(1)Pd8Rh4 cuboctahedra, edges with eight equivalent Rh(1)Pd12 cuboctahedra, edges with eight equivalent Pd(1)Pd8Rh4 cuboctahedra, edges with eight equivalent Pd(2)Pd8Rh4 cuboctahedra, faces with four equivalent Rh(1)Pd12 cuboctahedra, faces with four equivalent Pd(2)Pd8Rh4 cuboctahedra, and faces with ten equivalent Pd(1)Pd8Rh4 cuboctahedra. All Pd(1)-Pd(1) bond lengths are 2.74 Å. All Pd(1)-Pd(2) bond lengths are 2.76 Å. In the second Pd site, Pd(2) is bonded to four equivalent Rh(1) and eight equivalent Pd(1) atoms to form PdPd8Rh4 cuboctahedra that share corners with four equivalent Pd(2)Pd8Rh4 cuboctahedra, corners with eight equivalent Rh(1)Pd12 cuboctahedra, edges with eight equivalent Pd(2)Pd8Rh4 cuboctahedra, edges with sixteen equivalent Pd(1)Pd8Rh4 cuboctahedra, faces with four equivalent Pd(2)Pd8Rh4 cuboctahedra, faces with six equivalent Rh(1)Pd12 cuboctahedra, and faces with eight equivalent Pd(1)Pd8Rh4 cuboctahedra.