BeCeAl3 crystallizes in the tetragonal I4mm space group. Be(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), one Al(2), and four equivalent Al(1) atoms. Ce(1) is bonded in a 16-coordinate geometry to four equivalent Be(1), four equivalent Al(2), and eight equivalent Al(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Be(1), four equivalent Ce(1), two equivalent Al(2), and four equivalent Al(1) atoms to form a mixture of distorted corner, face, and edge-sharing AlCe4Be2Al6 cuboctahedra. In the second Al site, Al(2) is bonded in a 9-coordinate geometry to one Be(1), four equivalent Ce(1), and four equivalent Al(1) atoms.
BeCeAl3 crystallizes in the tetragonal I4mm space group. Be(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), one Al(2), and four equivalent Al(1) atoms. All Be(1)-Ce(1) bond lengths are 3.19 Å. The Be(1)-Al(2) bond length is 2.34 Å. All Be(1)-Al(1) bond lengths are 2.44 Å. Ce(1) is bonded in a 16-coordinate geometry to four equivalent Be(1), four equivalent Al(2), and eight equivalent Al(1) atoms. All Ce(1)-Al(2) bond lengths are 3.13 Å. There are four shorter (3.28 Å) and four longer (3.47 Å) Ce(1)-Al(1) bond lengths. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Be(1), four equivalent Ce(1), two equivalent Al(2), and four equivalent Al(1) atoms to form a mixture of distorted corner, face, and edge-sharing AlCe4Be2Al6 cuboctahedra. Both Al(1)-Al(2) bond lengths are 2.68 Å. All Al(1)-Al(1) bond lengths are 2.94 Å. In the second Al site, Al(2) is bonded in a 9-coordinate geometry to one Be(1), four equivalent Ce(1), and four equivalent Al(1) atoms.