Tb3Pr is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to four equivalent Tb(1), four equivalent Tb(2), and four equivalent Pr(1) atoms to form TbTb8Pr4 cuboctahedra that share corners with twelve equivalent Tb(1)Tb8Pr4 cuboctahedra, edges with eight equivalent Tb(1)Tb8Pr4 cuboctahedra, edges with eight equivalent Tb(2)Tb8Pr4 cuboctahedra, edges with eight equivalent Pr(1)Tb12 cuboctahedra, faces with four equivalent Tb(2)Tb8Pr4 cuboctahedra, faces with four equivalent Pr(1)Tb12 cuboctahedra, and faces with ten equivalent Tb(1)Tb8Pr4 cuboctahedra. In the second Tb site, Tb(2) is bonded to eight equivalent Tb(1) and four equivalent Pr(1) atoms to form TbTb8Pr4 cuboctahedra that share corners with four equivalent Tb(2)Tb8Pr4 cuboctahedra, corners with eight equivalent Pr(1)Tb12 cuboctahedra, edges with eight equivalent Tb(2)Tb8Pr4 cuboctahedra, edges with sixteen equivalent Tb(1)Tb8Pr4 cuboctahedra, faces with four equivalent Tb(2)Tb8Pr4 cuboctahedra, faces with six equivalent Pr(1)Tb12 cuboctahedra, and faces with eight equivalent Tb(1)Tb8Pr4 cuboctahedra. Pr(1) is bonded to four equivalent Tb(2) and eight equivalent Tb(1) atoms to form PrTb12 cuboctahedra that share corners with four equivalent Pr(1)Tb12 cuboctahedra, corners with eight equivalent Tb(2)Tb8Pr4 cuboctahedra, edges with eight equivalent Pr(1)Tb12 cuboctahedra, edges with sixteen equivalent Tb(1)Tb8Pr4 cuboctahedra, faces with four equivalent Pr(1)Tb12 cuboctahedra, faces with six equivalent Tb(2)Tb8Pr4 cuboctahedra, and faces with eight equivalent Tb(1)Tb8Pr4 cuboctahedra.
Tb3Pr is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to four equivalent Tb(1), four equivalent Tb(2), and four equivalent Pr(1) atoms to form TbTb8Pr4 cuboctahedra that share corners with twelve equivalent Tb(1)Tb8Pr4 cuboctahedra, edges with eight equivalent Tb(1)Tb8Pr4 cuboctahedra, edges with eight equivalent Tb(2)Tb8Pr4 cuboctahedra, edges with eight equivalent Pr(1)Tb12 cuboctahedra, faces with four equivalent Tb(2)Tb8Pr4 cuboctahedra, faces with four equivalent Pr(1)Tb12 cuboctahedra, and faces with ten equivalent Tb(1)Tb8Pr4 cuboctahedra. All Tb(1)-Tb(1) bond lengths are 3.61 Å. All Tb(1)-Tb(2) bond lengths are 3.60 Å. All Tb(1)-Pr(1) bond lengths are 3.60 Å. In the second Tb site, Tb(2) is bonded to eight equivalent Tb(1) and four equivalent Pr(1) atoms to form TbTb8Pr4 cuboctahedra that share corners with four equivalent Tb(2)Tb8Pr4 cuboctahedra, corners with eight equivalent Pr(1)Tb12 cuboctahedra, edges with eight equivalent Tb(2)Tb8Pr4 cuboctahedra, edges with sixteen equivalent Tb(1)Tb8Pr4 cuboctahedra, faces with four equivalent Tb(2)Tb8Pr4 cuboctahedra, faces with six equivalent Pr(1)Tb12 cuboctahedra, and faces with eight equivalent Tb(1)Tb8Pr4 cuboctahedra. All Tb(2)-Pr(1) bond lengths are 3.61 Å. Pr(1) is bonded to four equivalent Tb(2) and eight equivalent Tb(1) atoms to form PrTb12 cuboctahedra that share corners with four equivalent Pr(1)Tb12 cuboctahedra, corners with eight equivalent Tb(2)Tb8Pr4 cuboctahedra, edges with eight equivalent Pr(1)Tb12 cuboctahedra, edges with sixteen equivalent Tb(1)Tb8Pr4 cuboctahedra, faces with four equivalent Pr(1)Tb12 cuboctahedra, faces with six equivalent Tb(2)Tb8Pr4 cuboctahedra, and faces with eight equivalent Tb(1)Tb8Pr4 cuboctahedra.