Ba3Sm is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ba(1) is bonded to eight equivalent Ba(1) and four equivalent Sm(1) atoms to form distorted BaBa8Sm4 cuboctahedra that share corners with four equivalent Sm(1)Ba12 cuboctahedra, corners with fourteen equivalent Ba(1)Ba8Sm4 cuboctahedra, edges with six equivalent Sm(1)Ba12 cuboctahedra, edges with twelve equivalent Ba(1)Ba8Sm4 cuboctahedra, faces with four equivalent Sm(1)Ba12 cuboctahedra, and faces with sixteen equivalent Ba(1)Ba8Sm4 cuboctahedra. Sm(1) is bonded to twelve equivalent Ba(1) atoms to form SmBa12 cuboctahedra that share corners with six equivalent Sm(1)Ba12 cuboctahedra, corners with twelve equivalent Ba(1)Ba8Sm4 cuboctahedra, edges with eighteen equivalent Ba(1)Ba8Sm4 cuboctahedra, faces with eight equivalent Sm(1)Ba12 cuboctahedra, and faces with twelve equivalent Ba(1)Ba8Sm4 cuboctahedra.
Ba3Sm is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ba(1) is bonded to eight equivalent Ba(1) and four equivalent Sm(1) atoms to form distorted BaBa8Sm4 cuboctahedra that share corners with four equivalent Sm(1)Ba12 cuboctahedra, corners with fourteen equivalent Ba(1)Ba8Sm4 cuboctahedra, edges with six equivalent Sm(1)Ba12 cuboctahedra, edges with twelve equivalent Ba(1)Ba8Sm4 cuboctahedra, faces with four equivalent Sm(1)Ba12 cuboctahedra, and faces with sixteen equivalent Ba(1)Ba8Sm4 cuboctahedra. There are a spread of Ba(1)-Ba(1) bond distances ranging from 4.09-4.39 Å. There are two shorter (4.12 Å) and two longer (4.24 Å) Ba(1)-Sm(1) bond lengths. Sm(1) is bonded to twelve equivalent Ba(1) atoms to form SmBa12 cuboctahedra that share corners with six equivalent Sm(1)Ba12 cuboctahedra, corners with twelve equivalent Ba(1)Ba8Sm4 cuboctahedra, edges with eighteen equivalent Ba(1)Ba8Sm4 cuboctahedra, faces with eight equivalent Sm(1)Ba12 cuboctahedra, and faces with twelve equivalent Ba(1)Ba8Sm4 cuboctahedra.