EuCe3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Eu(1) is bonded to four equivalent Ce(2) and eight equivalent Ce(1) atoms to form EuCe12 cuboctahedra that share corners with four equivalent Eu(1)Ce12 cuboctahedra, corners with eight equivalent Ce(2)Ce8Eu4 cuboctahedra, edges with eight equivalent Eu(1)Ce12 cuboctahedra, edges with sixteen equivalent Ce(1)Ce8Eu4 cuboctahedra, faces with four equivalent Eu(1)Ce12 cuboctahedra, faces with six equivalent Ce(2)Ce8Eu4 cuboctahedra, and faces with eight equivalent Ce(1)Ce8Eu4 cuboctahedra. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to four equivalent Eu(1), four equivalent Ce(1), and four equivalent Ce(2) atoms to form CeCe8Eu4 cuboctahedra that share corners with twelve equivalent Ce(1)Ce8Eu4 cuboctahedra, edges with eight equivalent Eu(1)Ce12 cuboctahedra, edges with eight equivalent Ce(1)Ce8Eu4 cuboctahedra, edges with eight equivalent Ce(2)Ce8Eu4 cuboctahedra, faces with four equivalent Eu(1)Ce12 cuboctahedra, faces with four equivalent Ce(2)Ce8Eu4 cuboctahedra, and faces with ten equivalent Ce(1)Ce8Eu4 cuboctahedra. In the second Ce site, Ce(2) is bonded to four equivalent Eu(1) and eight equivalent Ce(1) atoms to form CeCe8Eu4 cuboctahedra that share corners with four equivalent Ce(2)Ce8Eu4 cuboctahedra, corners with eight equivalent Eu(1)Ce12 cuboctahedra, edges with eight equivalent Ce(2)Ce8Eu4 cuboctahedra, edges with sixteen equivalent Ce(1)Ce8Eu4 cuboctahedra, faces with four equivalent Ce(2)Ce8Eu4 cuboctahedra, faces with six equivalent Eu(1)Ce12 cuboctahedra, and faces with eight equivalent Ce(1)Ce8Eu4 cuboctahedra.
EuCe3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Eu(1) is bonded to four equivalent Ce(2) and eight equivalent Ce(1) atoms to form EuCe12 cuboctahedra that share corners with four equivalent Eu(1)Ce12 cuboctahedra, corners with eight equivalent Ce(2)Ce8Eu4 cuboctahedra, edges with eight equivalent Eu(1)Ce12 cuboctahedra, edges with sixteen equivalent Ce(1)Ce8Eu4 cuboctahedra, faces with four equivalent Eu(1)Ce12 cuboctahedra, faces with six equivalent Ce(2)Ce8Eu4 cuboctahedra, and faces with eight equivalent Ce(1)Ce8Eu4 cuboctahedra. All Eu(1)-Ce(2) bond lengths are 3.41 Å. All Eu(1)-Ce(1) bond lengths are 3.44 Å. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to four equivalent Eu(1), four equivalent Ce(1), and four equivalent Ce(2) atoms to form CeCe8Eu4 cuboctahedra that share corners with twelve equivalent Ce(1)Ce8Eu4 cuboctahedra, edges with eight equivalent Eu(1)Ce12 cuboctahedra, edges with eight equivalent Ce(1)Ce8Eu4 cuboctahedra, edges with eight equivalent Ce(2)Ce8Eu4 cuboctahedra, faces with four equivalent Eu(1)Ce12 cuboctahedra, faces with four equivalent Ce(2)Ce8Eu4 cuboctahedra, and faces with ten equivalent Ce(1)Ce8Eu4 cuboctahedra. All Ce(1)-Ce(1) bond lengths are 3.41 Å. All Ce(1)-Ce(2) bond lengths are 3.44 Å. In the second Ce site, Ce(2) is bonded to four equivalent Eu(1) and eight equivalent Ce(1) atoms to form CeCe8Eu4 cuboctahedra that share corners with four equivalent Ce(2)Ce8Eu4 cuboctahedra, corners with eight equivalent Eu(1)Ce12 cuboctahedra, edges with eight equivalent Ce(2)Ce8Eu4 cuboctahedra, edges with sixteen equivalent Ce(1)Ce8Eu4 cuboctahedra, faces with four equivalent Ce(2)Ce8Eu4 cuboctahedra, faces with six equivalent Eu(1)Ce12 cuboctahedra, and faces with eight equivalent Ce(1)Ce8Eu4 cuboctahedra.