Rb3Tm is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Rb(1) is bonded to eight equivalent Rb(1) and four equivalent Tm(1) atoms to form distorted RbRb8Tm4 cuboctahedra that share corners with twelve equivalent Rb(1)Rb8Tm4 cuboctahedra, edges with eight equivalent Tm(1)Rb12 cuboctahedra, edges with sixteen equivalent Rb(1)Rb8Tm4 cuboctahedra, faces with four equivalent Tm(1)Rb12 cuboctahedra, and faces with fourteen equivalent Rb(1)Rb8Tm4 cuboctahedra. Tm(1) is bonded to twelve equivalent Rb(1) atoms to form TmRb12 cuboctahedra that share corners with twelve equivalent Tm(1)Rb12 cuboctahedra, edges with twenty-four equivalent Rb(1)Rb8Tm4 cuboctahedra, faces with six equivalent Tm(1)Rb12 cuboctahedra, and faces with twelve equivalent Rb(1)Rb8Tm4 cuboctahedra.
Rb3Tm is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Rb(1) is bonded to eight equivalent Rb(1) and four equivalent Tm(1) atoms to form distorted RbRb8Tm4 cuboctahedra that share corners with twelve equivalent Rb(1)Rb8Tm4 cuboctahedra, edges with eight equivalent Tm(1)Rb12 cuboctahedra, edges with sixteen equivalent Rb(1)Rb8Tm4 cuboctahedra, faces with four equivalent Tm(1)Rb12 cuboctahedra, and faces with fourteen equivalent Rb(1)Rb8Tm4 cuboctahedra. All Rb(1)-Rb(1) bond lengths are 4.54 Å. All Rb(1)-Tm(1) bond lengths are 4.54 Å. Tm(1) is bonded to twelve equivalent Rb(1) atoms to form TmRb12 cuboctahedra that share corners with twelve equivalent Tm(1)Rb12 cuboctahedra, edges with twenty-four equivalent Rb(1)Rb8Tm4 cuboctahedra, faces with six equivalent Tm(1)Rb12 cuboctahedra, and faces with twelve equivalent Rb(1)Rb8Tm4 cuboctahedra.