CsEu crystallizes in the hexagonal P-6m2 space group. Cs(1) is bonded to six equivalent Cs(1) and six equivalent Eu(1) atoms to form CsCs6Eu6 cuboctahedra that share corners with eighteen equivalent Cs(1)Cs6Eu6 cuboctahedra, edges with six equivalent Cs(1)Cs6Eu6 cuboctahedra, edges with twelve equivalent Eu(1)Cs6Eu6 cuboctahedra, faces with eight equivalent Cs(1)Cs6Eu6 cuboctahedra, and faces with twelve equivalent Eu(1)Cs6Eu6 cuboctahedra. Eu(1) is bonded to six equivalent Cs(1) and six equivalent Eu(1) atoms to form EuCs6Eu6 cuboctahedra that share corners with eighteen equivalent Eu(1)Cs6Eu6 cuboctahedra, edges with six equivalent Eu(1)Cs6Eu6 cuboctahedra, edges with twelve equivalent Cs(1)Cs6Eu6 cuboctahedra, faces with eight equivalent Eu(1)Cs6Eu6 cuboctahedra, and faces with twelve equivalent Cs(1)Cs6Eu6 cuboctahedra.
CsEu crystallizes in the hexagonal P-6m2 space group. Cs(1) is bonded to six equivalent Cs(1) and six equivalent Eu(1) atoms to form CsCs6Eu6 cuboctahedra that share corners with eighteen equivalent Cs(1)Cs6Eu6 cuboctahedra, edges with six equivalent Cs(1)Cs6Eu6 cuboctahedra, edges with twelve equivalent Eu(1)Cs6Eu6 cuboctahedra, faces with eight equivalent Cs(1)Cs6Eu6 cuboctahedra, and faces with twelve equivalent Eu(1)Cs6Eu6 cuboctahedra. All Cs(1)-Cs(1) bond lengths are 4.46 Å. All Cs(1)-Eu(1) bond lengths are 4.76 Å. Eu(1) is bonded to six equivalent Cs(1) and six equivalent Eu(1) atoms to form EuCs6Eu6 cuboctahedra that share corners with eighteen equivalent Eu(1)Cs6Eu6 cuboctahedra, edges with six equivalent Eu(1)Cs6Eu6 cuboctahedra, edges with twelve equivalent Cs(1)Cs6Eu6 cuboctahedra, faces with eight equivalent Eu(1)Cs6Eu6 cuboctahedra, and faces with twelve equivalent Cs(1)Cs6Eu6 cuboctahedra. All Eu(1)-Eu(1) bond lengths are 4.46 Å.