Sm3Sc is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Sm(1) is bonded to eight equivalent Sm(1) and four equivalent Sc(1) atoms to form distorted SmSm8Sc4 cuboctahedra that share corners with four equivalent Sc(1)Sm12 cuboctahedra, corners with fourteen equivalent Sm(1)Sm8Sc4 cuboctahedra, edges with six equivalent Sc(1)Sm12 cuboctahedra, edges with twelve equivalent Sm(1)Sm8Sc4 cuboctahedra, faces with four equivalent Sc(1)Sm12 cuboctahedra, and faces with sixteen equivalent Sm(1)Sm8Sc4 cuboctahedra. Sc(1) is bonded to twelve equivalent Sm(1) atoms to form ScSm12 cuboctahedra that share corners with six equivalent Sc(1)Sm12 cuboctahedra, corners with twelve equivalent Sm(1)Sm8Sc4 cuboctahedra, edges with eighteen equivalent Sm(1)Sm8Sc4 cuboctahedra, faces with eight equivalent Sc(1)Sm12 cuboctahedra, and faces with twelve equivalent Sm(1)Sm8Sc4 cuboctahedra.
Sm3Sc is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Sm(1) is bonded to eight equivalent Sm(1) and four equivalent Sc(1) atoms to form distorted SmSm8Sc4 cuboctahedra that share corners with four equivalent Sc(1)Sm12 cuboctahedra, corners with fourteen equivalent Sm(1)Sm8Sc4 cuboctahedra, edges with six equivalent Sc(1)Sm12 cuboctahedra, edges with twelve equivalent Sm(1)Sm8Sc4 cuboctahedra, faces with four equivalent Sc(1)Sm12 cuboctahedra, and faces with sixteen equivalent Sm(1)Sm8Sc4 cuboctahedra. There are a spread of Sm(1)-Sm(1) bond distances ranging from 3.54-3.71 Å. There are two shorter (3.48 Å) and two longer (3.63 Å) Sm(1)-Sc(1) bond lengths. Sc(1) is bonded to twelve equivalent Sm(1) atoms to form ScSm12 cuboctahedra that share corners with six equivalent Sc(1)Sm12 cuboctahedra, corners with twelve equivalent Sm(1)Sm8Sc4 cuboctahedra, edges with eighteen equivalent Sm(1)Sm8Sc4 cuboctahedra, faces with eight equivalent Sc(1)Sm12 cuboctahedra, and faces with twelve equivalent Sm(1)Sm8Sc4 cuboctahedra.