Sm3Cd is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to four equivalent Sm(1), four equivalent Sm(2), and four equivalent Cd(1) atoms to form distorted SmSm8Cd4 cuboctahedra that share corners with twelve equivalent Sm(1)Sm8Cd4 cuboctahedra, edges with eight equivalent Sm(1)Sm8Cd4 cuboctahedra, edges with eight equivalent Sm(2)Sm8Cd4 cuboctahedra, edges with eight equivalent Cd(1)Sm12 cuboctahedra, faces with four equivalent Sm(2)Sm8Cd4 cuboctahedra, faces with four equivalent Cd(1)Sm12 cuboctahedra, and faces with ten equivalent Sm(1)Sm8Cd4 cuboctahedra. In the second Sm site, Sm(2) is bonded to eight equivalent Sm(1) and four equivalent Cd(1) atoms to form distorted SmSm8Cd4 cuboctahedra that share corners with four equivalent Sm(2)Sm8Cd4 cuboctahedra, corners with eight equivalent Cd(1)Sm12 cuboctahedra, edges with eight equivalent Sm(2)Sm8Cd4 cuboctahedra, edges with sixteen equivalent Sm(1)Sm8Cd4 cuboctahedra, faces with four equivalent Sm(2)Sm8Cd4 cuboctahedra, faces with six equivalent Cd(1)Sm12 cuboctahedra, and faces with eight equivalent Sm(1)Sm8Cd4 cuboctahedra. Cd(1) is bonded to four equivalent Sm(2) and eight equivalent Sm(1) atoms to form CdSm12 cuboctahedra that share corners with four equivalent Cd(1)Sm12 cuboctahedra, corners with eight equivalent Sm(2)Sm8Cd4 cuboctahedra, edges with eight equivalent Cd(1)Sm12 cuboctahedra, edges with sixteen equivalent Sm(1)Sm8Cd4 cuboctahedra, faces with four equivalent Cd(1)Sm12 cuboctahedra, faces with six equivalent Sm(2)Sm8Cd4 cuboctahedra, and faces with eight equivalent Sm(1)Sm8Cd4 cuboctahedra.
Sm3Cd is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to four equivalent Sm(1), four equivalent Sm(2), and four equivalent Cd(1) atoms to form distorted SmSm8Cd4 cuboctahedra that share corners with twelve equivalent Sm(1)Sm8Cd4 cuboctahedra, edges with eight equivalent Sm(1)Sm8Cd4 cuboctahedra, edges with eight equivalent Sm(2)Sm8Cd4 cuboctahedra, edges with eight equivalent Cd(1)Sm12 cuboctahedra, faces with four equivalent Sm(2)Sm8Cd4 cuboctahedra, faces with four equivalent Cd(1)Sm12 cuboctahedra, and faces with ten equivalent Sm(1)Sm8Cd4 cuboctahedra. All Sm(1)-Sm(1) bond lengths are 3.47 Å. All Sm(1)-Sm(2) bond lengths are 3.50 Å. All Sm(1)-Cd(1) bond lengths are 3.50 Å. In the second Sm site, Sm(2) is bonded to eight equivalent Sm(1) and four equivalent Cd(1) atoms to form distorted SmSm8Cd4 cuboctahedra that share corners with four equivalent Sm(2)Sm8Cd4 cuboctahedra, corners with eight equivalent Cd(1)Sm12 cuboctahedra, edges with eight equivalent Sm(2)Sm8Cd4 cuboctahedra, edges with sixteen equivalent Sm(1)Sm8Cd4 cuboctahedra, faces with four equivalent Sm(2)Sm8Cd4 cuboctahedra, faces with six equivalent Cd(1)Sm12 cuboctahedra, and faces with eight equivalent Sm(1)Sm8Cd4 cuboctahedra. All Sm(2)-Cd(1) bond lengths are 3.47 Å. Cd(1) is bonded to four equivalent Sm(2) and eight equivalent Sm(1) atoms to form CdSm12 cuboctahedra that share corners with four equivalent Cd(1)Sm12 cuboctahedra, corners with eight equivalent Sm(2)Sm8Cd4 cuboctahedra, edges with eight equivalent Cd(1)Sm12 cuboctahedra, edges with sixteen equivalent Sm(1)Sm8Cd4 cuboctahedra, faces with four equivalent Cd(1)Sm12 cuboctahedra, faces with six equivalent Sm(2)Sm8Cd4 cuboctahedra, and faces with eight equivalent Sm(1)Sm8Cd4 cuboctahedra.