Eu(Sr1) crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded to six equivalent Sr(1) and six equivalent Eu(1) atoms to form SrSr6Eu6 cuboctahedra that share corners with eighteen equivalent Sr(1)Sr6Eu6 cuboctahedra, edges with six equivalent Sr(1)Sr6Eu6 cuboctahedra, edges with twelve equivalent Eu(1)Sr6Eu6 cuboctahedra, faces with eight equivalent Sr(1)Sr6Eu6 cuboctahedra, and faces with twelve equivalent Eu(1)Sr6Eu6 cuboctahedra. Eu(1) is bonded to six equivalent Sr(1) and six equivalent Eu(1) atoms to form EuSr6Eu6 cuboctahedra that share corners with eighteen equivalent Eu(1)Sr6Eu6 cuboctahedra, edges with six equivalent Eu(1)Sr6Eu6 cuboctahedra, edges with twelve equivalent Sr(1)Sr6Eu6 cuboctahedra, faces with eight equivalent Eu(1)Sr6Eu6 cuboctahedra, and faces with twelve equivalent Sr(1)Sr6Eu6 cuboctahedra.
Eu(Sr1) crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded to six equivalent Sr(1) and six equivalent Eu(1) atoms to form SrSr6Eu6 cuboctahedra that share corners with eighteen equivalent Sr(1)Sr6Eu6 cuboctahedra, edges with six equivalent Sr(1)Sr6Eu6 cuboctahedra, edges with twelve equivalent Eu(1)Sr6Eu6 cuboctahedra, faces with eight equivalent Sr(1)Sr6Eu6 cuboctahedra, and faces with twelve equivalent Eu(1)Sr6Eu6 cuboctahedra. All Sr(1)-Sr(1) bond lengths are 4.14 Å. All Sr(1)-Eu(1) bond lengths are 4.18 Å. Eu(1) is bonded to six equivalent Sr(1) and six equivalent Eu(1) atoms to form EuSr6Eu6 cuboctahedra that share corners with eighteen equivalent Eu(1)Sr6Eu6 cuboctahedra, edges with six equivalent Eu(1)Sr6Eu6 cuboctahedra, edges with twelve equivalent Sr(1)Sr6Eu6 cuboctahedra, faces with eight equivalent Eu(1)Sr6Eu6 cuboctahedra, and faces with twelve equivalent Sr(1)Sr6Eu6 cuboctahedra. All Eu(1)-Eu(1) bond lengths are 4.14 Å.