SmPm3 is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Sm(1) is bonded to twelve equivalent Pm(1) atoms to form SmPm12 cuboctahedra that share corners with six equivalent Sm(1)Pm12 cuboctahedra, corners with twelve equivalent Pm(1)Pm8Sm4 cuboctahedra, edges with eighteen equivalent Pm(1)Pm8Sm4 cuboctahedra, faces with eight equivalent Sm(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Sm4 cuboctahedra. Pm(1) is bonded to four equivalent Sm(1) and eight equivalent Pm(1) atoms to form PmPm8Sm4 cuboctahedra that share corners with four equivalent Sm(1)Pm12 cuboctahedra, corners with fourteen equivalent Pm(1)Pm8Sm4 cuboctahedra, edges with six equivalent Sm(1)Pm12 cuboctahedra, edges with twelve equivalent Pm(1)Pm8Sm4 cuboctahedra, faces with four equivalent Sm(1)Pm12 cuboctahedra, and faces with sixteen equivalent Pm(1)Pm8Sm4 cuboctahedra.
SmPm3 is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Sm(1) is bonded to twelve equivalent Pm(1) atoms to form SmPm12 cuboctahedra that share corners with six equivalent Sm(1)Pm12 cuboctahedra, corners with twelve equivalent Pm(1)Pm8Sm4 cuboctahedra, edges with eighteen equivalent Pm(1)Pm8Sm4 cuboctahedra, faces with eight equivalent Sm(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Sm4 cuboctahedra. There are six shorter (3.62 Å) and six longer (3.72 Å) Sm(1)-Pm(1) bond lengths. Pm(1) is bonded to four equivalent Sm(1) and eight equivalent Pm(1) atoms to form PmPm8Sm4 cuboctahedra that share corners with four equivalent Sm(1)Pm12 cuboctahedra, corners with fourteen equivalent Pm(1)Pm8Sm4 cuboctahedra, edges with six equivalent Sm(1)Pm12 cuboctahedra, edges with twelve equivalent Pm(1)Pm8Sm4 cuboctahedra, faces with four equivalent Sm(1)Pm12 cuboctahedra, and faces with sixteen equivalent Pm(1)Pm8Sm4 cuboctahedra. There are four shorter (3.62 Å) and four longer (3.72 Å) Pm(1)-Pm(1) bond lengths.