TbSm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Tb(1) is bonded to twelve equivalent Sm(1) atoms to form TbSm12 cuboctahedra that share corners with six equivalent Tb(1)Sm12 cuboctahedra, corners with twelve equivalent Sm(1)Tb4Sm8 cuboctahedra, edges with eighteen equivalent Sm(1)Tb4Sm8 cuboctahedra, faces with eight equivalent Tb(1)Sm12 cuboctahedra, and faces with twelve equivalent Sm(1)Tb4Sm8 cuboctahedra. Sm(1) is bonded to four equivalent Tb(1) and eight equivalent Sm(1) atoms to form SmTb4Sm8 cuboctahedra that share corners with four equivalent Tb(1)Sm12 cuboctahedra, corners with fourteen equivalent Sm(1)Tb4Sm8 cuboctahedra, edges with six equivalent Tb(1)Sm12 cuboctahedra, edges with twelve equivalent Sm(1)Tb4Sm8 cuboctahedra, faces with four equivalent Tb(1)Sm12 cuboctahedra, and faces with sixteen equivalent Sm(1)Tb4Sm8 cuboctahedra.
TbSm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Tb(1) is bonded to twelve equivalent Sm(1) atoms to form TbSm12 cuboctahedra that share corners with six equivalent Tb(1)Sm12 cuboctahedra, corners with twelve equivalent Sm(1)Tb4Sm8 cuboctahedra, edges with eighteen equivalent Sm(1)Tb4Sm8 cuboctahedra, faces with eight equivalent Tb(1)Sm12 cuboctahedra, and faces with twelve equivalent Sm(1)Tb4Sm8 cuboctahedra. There are six shorter (3.62 Å) and six longer (3.68 Å) Tb(1)-Sm(1) bond lengths. Sm(1) is bonded to four equivalent Tb(1) and eight equivalent Sm(1) atoms to form SmTb4Sm8 cuboctahedra that share corners with four equivalent Tb(1)Sm12 cuboctahedra, corners with fourteen equivalent Sm(1)Tb4Sm8 cuboctahedra, edges with six equivalent Tb(1)Sm12 cuboctahedra, edges with twelve equivalent Sm(1)Tb4Sm8 cuboctahedra, faces with four equivalent Tb(1)Sm12 cuboctahedra, and faces with sixteen equivalent Sm(1)Tb4Sm8 cuboctahedra. There are a spread of Sm(1)-Sm(1) bond distances ranging from 3.64-3.71 Å.