TbPm3 is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Tb(1) is bonded to twelve equivalent Pm(1) atoms to form TbPm12 cuboctahedra that share corners with six equivalent Tb(1)Pm12 cuboctahedra, corners with twelve equivalent Pm(1)Tb4Pm8 cuboctahedra, edges with eighteen equivalent Pm(1)Tb4Pm8 cuboctahedra, faces with eight equivalent Tb(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Tb4Pm8 cuboctahedra. Pm(1) is bonded to four equivalent Tb(1) and eight equivalent Pm(1) atoms to form PmTb4Pm8 cuboctahedra that share corners with four equivalent Tb(1)Pm12 cuboctahedra, corners with fourteen equivalent Pm(1)Tb4Pm8 cuboctahedra, edges with six equivalent Tb(1)Pm12 cuboctahedra, edges with twelve equivalent Pm(1)Tb4Pm8 cuboctahedra, faces with four equivalent Tb(1)Pm12 cuboctahedra, and faces with sixteen equivalent Pm(1)Tb4Pm8 cuboctahedra.
TbPm3 is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Tb(1) is bonded to twelve equivalent Pm(1) atoms to form TbPm12 cuboctahedra that share corners with six equivalent Tb(1)Pm12 cuboctahedra, corners with twelve equivalent Pm(1)Tb4Pm8 cuboctahedra, edges with eighteen equivalent Pm(1)Tb4Pm8 cuboctahedra, faces with eight equivalent Tb(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Tb4Pm8 cuboctahedra. There are six shorter (3.60 Å) and six longer (3.70 Å) Tb(1)-Pm(1) bond lengths. Pm(1) is bonded to four equivalent Tb(1) and eight equivalent Pm(1) atoms to form PmTb4Pm8 cuboctahedra that share corners with four equivalent Tb(1)Pm12 cuboctahedra, corners with fourteen equivalent Pm(1)Tb4Pm8 cuboctahedra, edges with six equivalent Tb(1)Pm12 cuboctahedra, edges with twelve equivalent Pm(1)Tb4Pm8 cuboctahedra, faces with four equivalent Tb(1)Pm12 cuboctahedra, and faces with sixteen equivalent Pm(1)Tb4Pm8 cuboctahedra. There are a spread of Pm(1)-Pm(1) bond distances ranging from 3.60-3.71 Å.