K3Sm is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent K(1), four equivalent K(2), and four equivalent Sm(1) atoms to form KK8Sm4 cuboctahedra that share corners with twelve equivalent K(1)K8Sm4 cuboctahedra, edges with eight equivalent K(1)K8Sm4 cuboctahedra, edges with eight equivalent Sm(1)K12 cuboctahedra, faces with four equivalent Sm(1)K12 cuboctahedra, and faces with ten equivalent K(1)K8Sm4 cuboctahedra. In the second K site, K(2) is bonded in a distorted square co-planar geometry to eight equivalent K(1) and four equivalent Sm(1) atoms. Sm(1) is bonded to four equivalent K(2) and eight equivalent K(1) atoms to form SmK12 cuboctahedra that share corners with four equivalent Sm(1)K12 cuboctahedra, edges with eight equivalent Sm(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Sm4 cuboctahedra, faces with four equivalent Sm(1)K12 cuboctahedra, and faces with eight equivalent K(1)K8Sm4 cuboctahedra.
K3Sm is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent K(1), four equivalent K(2), and four equivalent Sm(1) atoms to form KK8Sm4 cuboctahedra that share corners with twelve equivalent K(1)K8Sm4 cuboctahedra, edges with eight equivalent K(1)K8Sm4 cuboctahedra, edges with eight equivalent Sm(1)K12 cuboctahedra, faces with four equivalent Sm(1)K12 cuboctahedra, and faces with ten equivalent K(1)K8Sm4 cuboctahedra. All K(1)-K(1) bond lengths are 4.18 Å. All K(1)-K(2) bond lengths are 4.43 Å. All K(1)-Sm(1) bond lengths are 4.43 Å. In the second K site, K(2) is bonded in a distorted square co-planar geometry to eight equivalent K(1) and four equivalent Sm(1) atoms. All K(2)-Sm(1) bond lengths are 4.18 Å. Sm(1) is bonded to four equivalent K(2) and eight equivalent K(1) atoms to form SmK12 cuboctahedra that share corners with four equivalent Sm(1)K12 cuboctahedra, edges with eight equivalent Sm(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Sm4 cuboctahedra, faces with four equivalent Sm(1)K12 cuboctahedra, and faces with eight equivalent K(1)K8Sm4 cuboctahedra.