RbCe3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Rb(1) is bonded to four equivalent Ce(2) and eight equivalent Ce(1) atoms to form RbCe12 cuboctahedra that share corners with four equivalent Rb(1)Ce12 cuboctahedra, corners with eight equivalent Ce(2)Rb4Ce8 cuboctahedra, edges with eight equivalent Rb(1)Ce12 cuboctahedra, edges with sixteen equivalent Ce(1)Rb4Ce8 cuboctahedra, faces with four equivalent Rb(1)Ce12 cuboctahedra, faces with six equivalent Ce(2)Rb4Ce8 cuboctahedra, and faces with eight equivalent Ce(1)Rb4Ce8 cuboctahedra. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to four equivalent Rb(1), four equivalent Ce(1), and four equivalent Ce(2) atoms to form CeRb4Ce8 cuboctahedra that share corners with twelve equivalent Ce(1)Rb4Ce8 cuboctahedra, edges with eight equivalent Rb(1)Ce12 cuboctahedra, edges with eight equivalent Ce(1)Rb4Ce8 cuboctahedra, edges with eight equivalent Ce(2)Rb4Ce8 cuboctahedra, faces with four equivalent Rb(1)Ce12 cuboctahedra, faces with four equivalent Ce(2)Rb4Ce8 cuboctahedra, and faces with ten equivalent Ce(1)Rb4Ce8 cuboctahedra. In the second Ce site, Ce(2) is bonded to four equivalent Rb(1) and eight equivalent Ce(1) atoms to form CeRb4Ce8 cuboctahedra that share corners with four equivalent Ce(2)Rb4Ce8 cuboctahedra, corners with eight equivalent Rb(1)Ce12 cuboctahedra, edges with eight equivalent Ce(2)Rb4Ce8 cuboctahedra, edges with sixteen equivalent Ce(1)Rb4Ce8 cuboctahedra, faces with four equivalent Ce(2)Rb4Ce8 cuboctahedra, faces with six equivalent Rb(1)Ce12 cuboctahedra, and faces with eight equivalent Ce(1)Rb4Ce8 cuboctahedra.
RbCe3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Rb(1) is bonded to four equivalent Ce(2) and eight equivalent Ce(1) atoms to form RbCe12 cuboctahedra that share corners with four equivalent Rb(1)Ce12 cuboctahedra, corners with eight equivalent Ce(2)Rb4Ce8 cuboctahedra, edges with eight equivalent Rb(1)Ce12 cuboctahedra, edges with sixteen equivalent Ce(1)Rb4Ce8 cuboctahedra, faces with four equivalent Rb(1)Ce12 cuboctahedra, faces with six equivalent Ce(2)Rb4Ce8 cuboctahedra, and faces with eight equivalent Ce(1)Rb4Ce8 cuboctahedra. All Rb(1)-Ce(2) bond lengths are 3.69 Å. All Rb(1)-Ce(1) bond lengths are 3.70 Å. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to four equivalent Rb(1), four equivalent Ce(1), and four equivalent Ce(2) atoms to form CeRb4Ce8 cuboctahedra that share corners with twelve equivalent Ce(1)Rb4Ce8 cuboctahedra, edges with eight equivalent Rb(1)Ce12 cuboctahedra, edges with eight equivalent Ce(1)Rb4Ce8 cuboctahedra, edges with eight equivalent Ce(2)Rb4Ce8 cuboctahedra, faces with four equivalent Rb(1)Ce12 cuboctahedra, faces with four equivalent Ce(2)Rb4Ce8 cuboctahedra, and faces with ten equivalent Ce(1)Rb4Ce8 cuboctahedra. All Ce(1)-Ce(1) bond lengths are 3.69 Å. All Ce(1)-Ce(2) bond lengths are 3.70 Å. In the second Ce site, Ce(2) is bonded to four equivalent Rb(1) and eight equivalent Ce(1) atoms to form CeRb4Ce8 cuboctahedra that share corners with four equivalent Ce(2)Rb4Ce8 cuboctahedra, corners with eight equivalent Rb(1)Ce12 cuboctahedra, edges with eight equivalent Ce(2)Rb4Ce8 cuboctahedra, edges with sixteen equivalent Ce(1)Rb4Ce8 cuboctahedra, faces with four equivalent Ce(2)Rb4Ce8 cuboctahedra, faces with six equivalent Rb(1)Ce12 cuboctahedra, and faces with eight equivalent Ce(1)Rb4Ce8 cuboctahedra.