K3Sr 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 Sr(1) atoms to form KK8Sr4 cuboctahedra that share corners with twelve equivalent K(1)K8Sr4 cuboctahedra, edges with eight equivalent K(1)K8Sr4 cuboctahedra, edges with eight equivalent K(2)K8Sr4 cuboctahedra, edges with eight equivalent Sr(1)K12 cuboctahedra, faces with four equivalent K(2)K8Sr4 cuboctahedra, faces with four equivalent Sr(1)K12 cuboctahedra, and faces with ten equivalent K(1)K8Sr4 cuboctahedra. In the second K site, K(2) is bonded to eight equivalent K(1) and four equivalent Sr(1) atoms to form distorted KK8Sr4 cuboctahedra that share corners with four equivalent K(2)K8Sr4 cuboctahedra, corners with eight equivalent Sr(1)K12 cuboctahedra, edges with eight equivalent K(2)K8Sr4 cuboctahedra, edges with sixteen equivalent K(1)K8Sr4 cuboctahedra, faces with four equivalent K(2)K8Sr4 cuboctahedra, faces with six equivalent Sr(1)K12 cuboctahedra, and faces with eight equivalent K(1)K8Sr4 cuboctahedra. Sr(1) is bonded to four equivalent K(2) and eight equivalent K(1) atoms to form SrK12 cuboctahedra that share corners with four equivalent Sr(1)K12 cuboctahedra, corners with eight equivalent K(2)K8Sr4 cuboctahedra, edges with eight equivalent Sr(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Sr4 cuboctahedra, faces with four equivalent Sr(1)K12 cuboctahedra, faces with six equivalent K(2)K8Sr4 cuboctahedra, and faces with eight equivalent K(1)K8Sr4 cuboctahedra.
K3Sr 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 Sr(1) atoms to form KK8Sr4 cuboctahedra that share corners with twelve equivalent K(1)K8Sr4 cuboctahedra, edges with eight equivalent K(1)K8Sr4 cuboctahedra, edges with eight equivalent K(2)K8Sr4 cuboctahedra, edges with eight equivalent Sr(1)K12 cuboctahedra, faces with four equivalent K(2)K8Sr4 cuboctahedra, faces with four equivalent Sr(1)K12 cuboctahedra, and faces with ten equivalent K(1)K8Sr4 cuboctahedra. All K(1)-K(1) bond lengths are 4.49 Å. All K(1)-K(2) bond lengths are 4.67 Å. All K(1)-Sr(1) bond lengths are 4.67 Å. In the second K site, K(2) is bonded to eight equivalent K(1) and four equivalent Sr(1) atoms to form distorted KK8Sr4 cuboctahedra that share corners with four equivalent K(2)K8Sr4 cuboctahedra, corners with eight equivalent Sr(1)K12 cuboctahedra, edges with eight equivalent K(2)K8Sr4 cuboctahedra, edges with sixteen equivalent K(1)K8Sr4 cuboctahedra, faces with four equivalent K(2)K8Sr4 cuboctahedra, faces with six equivalent Sr(1)K12 cuboctahedra, and faces with eight equivalent K(1)K8Sr4 cuboctahedra. All K(2)-Sr(1) bond lengths are 4.49 Å. Sr(1) is bonded to four equivalent K(2) and eight equivalent K(1) atoms to form SrK12 cuboctahedra that share corners with four equivalent Sr(1)K12 cuboctahedra, corners with eight equivalent K(2)K8Sr4 cuboctahedra, edges with eight equivalent Sr(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Sr4 cuboctahedra, faces with four equivalent Sr(1)K12 cuboctahedra, faces with six equivalent K(2)K8Sr4 cuboctahedra, and faces with eight equivalent K(1)K8Sr4 cuboctahedra.