K3Tm 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 Tm(1) atoms to form distorted KK8Tm4 cuboctahedra that share corners with twelve equivalent K(1)K8Tm4 cuboctahedra, edges with eight equivalent Tm(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Tm4 cuboctahedra, faces with four equivalent Tm(1)K12 cuboctahedra, and faces with fourteen equivalent K(1)K8Tm4 cuboctahedra. Tm(1) is bonded to twelve equivalent K(1) atoms to form TmK12 cuboctahedra that share corners with twelve equivalent Tm(1)K12 cuboctahedra, edges with twenty-four equivalent K(1)K8Tm4 cuboctahedra, faces with six equivalent Tm(1)K12 cuboctahedra, and faces with twelve equivalent K(1)K8Tm4 cuboctahedra.
K3Tm 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 Tm(1) atoms to form distorted KK8Tm4 cuboctahedra that share corners with twelve equivalent K(1)K8Tm4 cuboctahedra, edges with eight equivalent Tm(1)K12 cuboctahedra, edges with sixteen equivalent K(1)K8Tm4 cuboctahedra, faces with four equivalent Tm(1)K12 cuboctahedra, and faces with fourteen equivalent K(1)K8Tm4 cuboctahedra. All K(1)-K(1) bond lengths are 4.30 Å. All K(1)-Tm(1) bond lengths are 4.30 Å. Tm(1) is bonded to twelve equivalent K(1) atoms to form TmK12 cuboctahedra that share corners with twelve equivalent Tm(1)K12 cuboctahedra, edges with twenty-four equivalent K(1)K8Tm4 cuboctahedra, faces with six equivalent Tm(1)K12 cuboctahedra, and faces with twelve equivalent K(1)K8Tm4 cuboctahedra.