ThPm3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Th(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form ThPm12 cuboctahedra that share corners with four equivalent Th(1)Pm12 cuboctahedra, corners with eight equivalent Pm(2)Pm8Th4 cuboctahedra, edges with eight equivalent Th(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Th4 cuboctahedra, faces with four equivalent Th(1)Pm12 cuboctahedra, faces with six equivalent Pm(2)Pm8Th4 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Th4 cuboctahedra. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Th(1), four equivalent Pm(1), and four equivalent Pm(2) atoms to form PmPm8Th4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Th4 cuboctahedra, edges with eight equivalent Th(1)Pm12 cuboctahedra, edges with eight equivalent Pm(1)Pm8Th4 cuboctahedra, edges with eight equivalent Pm(2)Pm8Th4 cuboctahedra, faces with four equivalent Th(1)Pm12 cuboctahedra, faces with four equivalent Pm(2)Pm8Th4 cuboctahedra, and faces with ten equivalent Pm(1)Pm8Th4 cuboctahedra. In the second Pm site, Pm(2) is bonded to four equivalent Th(1) and eight equivalent Pm(1) atoms to form PmPm8Th4 cuboctahedra that share corners with four equivalent Pm(2)Pm8Th4 cuboctahedra, corners with eight equivalent Th(1)Pm12 cuboctahedra, edges with eight equivalent Pm(2)Pm8Th4 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Th4 cuboctahedra, faces with four equivalent Pm(2)Pm8Th4 cuboctahedra, faces with six equivalent Th(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Th4 cuboctahedra.
ThPm3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Th(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form ThPm12 cuboctahedra that share corners with four equivalent Th(1)Pm12 cuboctahedra, corners with eight equivalent Pm(2)Pm8Th4 cuboctahedra, edges with eight equivalent Th(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Th4 cuboctahedra, faces with four equivalent Th(1)Pm12 cuboctahedra, faces with six equivalent Pm(2)Pm8Th4 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Th4 cuboctahedra. All Th(1)-Pm(2) bond lengths are 3.65 Å. All Th(1)-Pm(1) bond lengths are 3.63 Å. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Th(1), four equivalent Pm(1), and four equivalent Pm(2) atoms to form PmPm8Th4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Th4 cuboctahedra, edges with eight equivalent Th(1)Pm12 cuboctahedra, edges with eight equivalent Pm(1)Pm8Th4 cuboctahedra, edges with eight equivalent Pm(2)Pm8Th4 cuboctahedra, faces with four equivalent Th(1)Pm12 cuboctahedra, faces with four equivalent Pm(2)Pm8Th4 cuboctahedra, and faces with ten equivalent Pm(1)Pm8Th4 cuboctahedra. All Pm(1)-Pm(1) bond lengths are 3.65 Å. All Pm(1)-Pm(2) bond lengths are 3.63 Å. In the second Pm site, Pm(2) is bonded to four equivalent Th(1) and eight equivalent Pm(1) atoms to form PmPm8Th4 cuboctahedra that share corners with four equivalent Pm(2)Pm8Th4 cuboctahedra, corners with eight equivalent Th(1)Pm12 cuboctahedra, edges with eight equivalent Pm(2)Pm8Th4 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Th4 cuboctahedra, faces with four equivalent Pm(2)Pm8Th4 cuboctahedra, faces with six equivalent Th(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Th4 cuboctahedra.