Tb2Pr is alpha Samarium-derived structured and crystallizes in the trigonal R3m space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to three equivalent Tb(2), six equivalent Tb(1), and three equivalent Pr(1) atoms to form TbTb9Pr3 cuboctahedra that share corners with three equivalent Pr(1)Tb6Pr6 cuboctahedra, corners with six equivalent Tb(1)Tb9Pr3 cuboctahedra, corners with six equivalent Tb(2)Tb9Pr3 cuboctahedra, edges with six equivalent Tb(1)Tb9Pr3 cuboctahedra, edges with six equivalent Tb(2)Tb9Pr3 cuboctahedra, edges with nine equivalent Pr(1)Tb6Pr6 cuboctahedra, faces with six equivalent Tb(1)Tb9Pr3 cuboctahedra, faces with six equivalent Pr(1)Tb6Pr6 cuboctahedra, and faces with seven equivalent Tb(2)Tb9Pr3 cuboctahedra. In the second Tb site, Tb(2) is bonded to three equivalent Tb(1), six equivalent Tb(2), and three equivalent Pr(1) atoms to form TbTb9Pr3 cuboctahedra that share corners with six equivalent Tb(1)Tb9Pr3 cuboctahedra, corners with six equivalent Tb(2)Tb9Pr3 cuboctahedra, corners with six equivalent Pr(1)Tb6Pr6 cuboctahedra, edges with six equivalent Tb(1)Tb9Pr3 cuboctahedra, edges with six equivalent Tb(2)Tb9Pr3 cuboctahedra, edges with six equivalent Pr(1)Tb6Pr6 cuboctahedra, faces with six equivalent Tb(2)Tb9Pr3 cuboctahedra, faces with seven equivalent Tb(1)Tb9Pr3 cuboctahedra, and faces with seven equivalent Pr(1)Tb6Pr6 cuboctahedra. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to three equivalent Tb(1), three equivalent Tb(2), and six equivalent Pr(1) atoms to form PrTb6Pr6 cuboctahedra that share corners with three equivalent Tb(1)Tb9Pr3 cuboctahedra, corners with six equivalent Tb(2)Tb9Pr3 cuboctahedra, corners with six equivalent Pr(1)Tb6Pr6 cuboctahedra, edges with six equivalent Tb(2)Tb9Pr3 cuboctahedra, edges with six equivalent Pr(1)Tb6Pr6 cuboctahedra, edges with nine equivalent Tb(1)Tb9Pr3 cuboctahedra, faces with six equivalent Tb(1)Tb9Pr3 cuboctahedra, faces with six equivalent Pr(1)Tb6Pr6 cuboctahedra, and faces with seven equivalent Tb(2)Tb9Pr3 cuboctahedra. In the second Pr site, Pr(1) is bonded to three equivalent Tb(1), three equivalent Tb(2), and six equivalent Pr(1) atoms to form PrTb6Pr6 cuboctahedra that share corners with three equivalent Tb(1)Tb9Pr3 cuboctahedra, corners with six equivalent Tb(2)Tb9Pr3 cuboctahedra, corners with six equivalent Pr(1)Tb6Pr6 cuboctahedra, edges with six equivalent Tb(2)Tb9Pr3 cuboctahedra, edges with six equivalent Pr(1)Tb6Pr6 cuboctahedra, edges with nine equivalent Tb(1)Tb9Pr3 cuboctahedra, faces with six equivalent Tb(1)Tb9Pr3 cuboctahedra, faces with six equivalent Pr(1)Tb6Pr6 cuboctahedra, and faces with seven equivalent Tb(2)Tb9Pr3 cuboctahedra.
Tb2Pr is alpha Samarium-derived structured and crystallizes in the trigonal R3m space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to three equivalent Tb(2), six equivalent Tb(1), and three equivalent Pr(1) atoms to form TbTb9Pr3 cuboctahedra that share corners with three equivalent Pr(1)Tb6Pr6 cuboctahedra, corners with six equivalent Tb(1)Tb9Pr3 cuboctahedra, corners with six equivalent Tb(2)Tb9Pr3 cuboctahedra, edges with six equivalent Tb(1)Tb9Pr3 cuboctahedra, edges with six equivalent Tb(2)Tb9Pr3 cuboctahedra, edges with nine equivalent Pr(1)Tb6Pr6 cuboctahedra, faces with six equivalent Tb(1)Tb9Pr3 cuboctahedra, faces with six equivalent Pr(1)Tb6Pr6 cuboctahedra, and faces with seven equivalent Tb(2)Tb9Pr3 cuboctahedra. All Tb(1)-Tb(2) bond lengths are 3.52 Å. All Tb(1)-Tb(1) bond lengths are 3.66 Å. All Tb(1)-Pr(1) bond lengths are 3.62 Å. In the second Tb site, Tb(2) is bonded to three equivalent Tb(1), six equivalent Tb(2), and three equivalent Pr(1) atoms to form TbTb9Pr3 cuboctahedra that share corners with six equivalent Tb(1)Tb9Pr3 cuboctahedra, corners with six equivalent Tb(2)Tb9Pr3 cuboctahedra, corners with six equivalent Pr(1)Tb6Pr6 cuboctahedra, edges with six equivalent Tb(1)Tb9Pr3 cuboctahedra, edges with six equivalent Tb(2)Tb9Pr3 cuboctahedra, edges with six equivalent Pr(1)Tb6Pr6 cuboctahedra, faces with six equivalent Tb(2)Tb9Pr3 cuboctahedra, faces with seven equivalent Tb(1)Tb9Pr3 cuboctahedra, and faces with seven equivalent Pr(1)Tb6Pr6 cuboctahedra. All Tb(2)-Tb(2) bond lengths are 3.66 Å. All Tb(2)-Pr(1) bond lengths are 3.65 Å. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to three equivalent Tb(1), three equivalent Tb(2), and six equivalent Pr(1) atoms to form PrTb6Pr6 cuboctahedra that share corners with three equivalent Tb(1)Tb9Pr3 cuboctahedra, corners with six equivalent Tb(2)Tb9Pr3 cuboctahedra, corners with six equivalent Pr(1)Tb6Pr6 cuboctahedra, edges with six equivalent Tb(2)Tb9Pr3 cuboctahedra, edges with six equivalent Pr(1)Tb6Pr6 cuboctahedra, edges with nine equivalent Tb(1)Tb9Pr3 cuboctahedra, faces with six equivalent Tb(1)Tb9Pr3 cuboctahedra, faces with six equivalent Pr(1)Tb6Pr6 cuboctahedra, and faces with seven equivalent Tb(2)Tb9Pr3 cuboctahedra. All Pr(1)-Pr(1) bond lengths are 3.66 Å. In the second Pr site, Pr(1) is bonded to three equivalent Tb(1), three equivalent Tb(2), and six equivalent Pr(1) atoms to form PrTb6Pr6 cuboctahedra that share corners with three equivalent Tb(1)Tb9Pr3 cuboctahedra, corners with six equivalent Tb(2)Tb9Pr3 cuboctahedra, corners with six equivalent Pr(1)Tb6Pr6 cuboctahedra, edges with six equivalent Tb(2)Tb9Pr3 cuboctahedra, edges with six equivalent Pr(1)Tb6Pr6 cuboctahedra, edges with nine equivalent Tb(1)Tb9Pr3 cuboctahedra, faces with six equivalent Tb(1)Tb9Pr3 cuboctahedra, faces with six equivalent Pr(1)Tb6Pr6 cuboctahedra, and faces with seven equivalent Tb(2)Tb9Pr3 cuboctahedra. All Pr(1)-Tb(1) bond lengths are 3.62 Å. All Pr(1)-Tb(2) bond lengths are 3.65 Å. All Pr(1)-Pr(1) bond lengths are 3.66 Å.