CeY3 crystallizes in the tetragonal I4/mmm space group. Ce(1) is bonded to four equivalent Y(2) and eight equivalent Y(1) atoms to form CeY12 cuboctahedra that share corners with four equivalent Ce(1)Y12 cuboctahedra, corners with eight equivalent Y(2)Ce4Y8 cuboctahedra, edges with eight equivalent Ce(1)Y12 cuboctahedra, edges with sixteen equivalent Y(1)Ce4Y8 cuboctahedra, faces with four equivalent Ce(1)Y12 cuboctahedra, faces with six equivalent Y(2)Ce4Y8 cuboctahedra, and faces with eight equivalent Y(1)Ce4Y8 cuboctahedra. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to four equivalent Ce(1), four equivalent Y(1), and four equivalent Y(2) atoms to form YCe4Y8 cuboctahedra that share corners with twelve equivalent Y(1)Ce4Y8 cuboctahedra, edges with eight equivalent Ce(1)Y12 cuboctahedra, edges with eight equivalent Y(1)Ce4Y8 cuboctahedra, edges with eight equivalent Y(2)Ce4Y8 cuboctahedra, faces with four equivalent Ce(1)Y12 cuboctahedra, faces with four equivalent Y(2)Ce4Y8 cuboctahedra, and faces with ten equivalent Y(1)Ce4Y8 cuboctahedra. In the second Y site, Y(2) is bonded to four equivalent Ce(1) and eight equivalent Y(1) atoms to form YCe4Y8 cuboctahedra that share corners with four equivalent Y(2)Ce4Y8 cuboctahedra, corners with eight equivalent Ce(1)Y12 cuboctahedra, edges with eight equivalent Y(2)Ce4Y8 cuboctahedra, edges with sixteen equivalent Y(1)Ce4Y8 cuboctahedra, faces with four equivalent Y(2)Ce4Y8 cuboctahedra, faces with six equivalent Ce(1)Y12 cuboctahedra, and faces with eight equivalent Y(1)Ce4Y8 cuboctahedra.
CeY3 crystallizes in the tetragonal I4/mmm space group. Ce(1) is bonded to four equivalent Y(2) and eight equivalent Y(1) atoms to form CeY12 cuboctahedra that share corners with four equivalent Ce(1)Y12 cuboctahedra, corners with eight equivalent Y(2)Ce4Y8 cuboctahedra, edges with eight equivalent Ce(1)Y12 cuboctahedra, edges with sixteen equivalent Y(1)Ce4Y8 cuboctahedra, faces with four equivalent Ce(1)Y12 cuboctahedra, faces with six equivalent Y(2)Ce4Y8 cuboctahedra, and faces with eight equivalent Y(1)Ce4Y8 cuboctahedra. All Ce(1)-Y(2) bond lengths are 3.55 Å. All Ce(1)-Y(1) bond lengths are 3.54 Å. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to four equivalent Ce(1), four equivalent Y(1), and four equivalent Y(2) atoms to form YCe4Y8 cuboctahedra that share corners with twelve equivalent Y(1)Ce4Y8 cuboctahedra, edges with eight equivalent Ce(1)Y12 cuboctahedra, edges with eight equivalent Y(1)Ce4Y8 cuboctahedra, edges with eight equivalent Y(2)Ce4Y8 cuboctahedra, faces with four equivalent Ce(1)Y12 cuboctahedra, faces with four equivalent Y(2)Ce4Y8 cuboctahedra, and faces with ten equivalent Y(1)Ce4Y8 cuboctahedra. All Y(1)-Y(1) bond lengths are 3.55 Å. All Y(1)-Y(2) bond lengths are 3.54 Å. In the second Y site, Y(2) is bonded to four equivalent Ce(1) and eight equivalent Y(1) atoms to form YCe4Y8 cuboctahedra that share corners with four equivalent Y(2)Ce4Y8 cuboctahedra, corners with eight equivalent Ce(1)Y12 cuboctahedra, edges with eight equivalent Y(2)Ce4Y8 cuboctahedra, edges with sixteen equivalent Y(1)Ce4Y8 cuboctahedra, faces with four equivalent Y(2)Ce4Y8 cuboctahedra, faces with six equivalent Ce(1)Y12 cuboctahedra, and faces with eight equivalent Y(1)Ce4Y8 cuboctahedra.