K3Cu is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. K(1) is bonded to eight equivalent K(1) and four equivalent Cu(1) atoms to form distorted KK8Cu4 cuboctahedra that share corners with twelve equivalent K(1)K8Cu4 cuboctahedra, edges with eight equivalent Cu(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Cu4 cuboctahedra, faces with four equivalent Cu(1)K12 cuboctahedra, and faces with fourteen equivalent K(1)K8Cu4 cuboctahedra. Cu(1) is bonded to twelve equivalent K(1) atoms to form distorted CuK12 cuboctahedra that share corners with twelve equivalent Cu(1)K12 cuboctahedra, edges with twenty-four equivalent K(1)K8Cu4 cuboctahedra, faces with six equivalent Cu(1)K12 cuboctahedra, and faces with twelve equivalent K(1)K8Cu4 cuboctahedra.
K3Cu is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. K(1) is bonded to eight equivalent K(1) and four equivalent Cu(1) atoms to form distorted KK8Cu4 cuboctahedra that share corners with twelve equivalent K(1)K8Cu4 cuboctahedra, edges with eight equivalent Cu(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Cu4 cuboctahedra, faces with four equivalent Cu(1)K12 cuboctahedra, and faces with fourteen equivalent K(1)K8Cu4 cuboctahedra. All K(1)-K(1) bond lengths are 4.11 Å. All K(1)-Cu(1) bond lengths are 4.11 Å. Cu(1) is bonded to twelve equivalent K(1) atoms to form distorted CuK12 cuboctahedra that share corners with twelve equivalent Cu(1)K12 cuboctahedra, edges with twenty-four equivalent K(1)K8Cu4 cuboctahedra, faces with six equivalent Cu(1)K12 cuboctahedra, and faces with twelve equivalent K(1)K8Cu4 cuboctahedra.