Ce2Ni2GaAl crystallizes in the monoclinic Pm space group. There are six inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 11-coordinate geometry to one Ni(5), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ga(2), two equivalent Al(1), and two equivalent Al(2) atoms. In the second Ce site, Ce(2) is bonded in a 11-coordinate geometry to one Ni(6), two equivalent Ni(1), two equivalent Ni(4), two equivalent Ga(1), two equivalent Ga(3), and two equivalent Al(3) atoms. In the third Ce site, Ce(3) is bonded in a 11-coordinate geometry to one Ni(5), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ga(2), two equivalent Ga(3), and two equivalent Al(2) atoms. In the fourth Ce site, Ce(4) is bonded in a 11-coordinate geometry to one Ni(6), two equivalent Ni(2), two equivalent Ni(4), two equivalent Ga(1), two equivalent Al(1), and two equivalent Al(3) atoms. In the fifth Ce site, Ce(5) is bonded in a 11-coordinate geometry to one Ni(6), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ga(1), two equivalent Ga(3), and two equivalent Al(2) atoms. In the sixth Ce site, Ce(6) is bonded in a 11-coordinate geometry to one Ni(5), two equivalent Ni(2), two equivalent Ni(4), two equivalent Ga(2), two equivalent Al(1), and two equivalent Al(3) atoms. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to two equivalent Ce(2), two equivalent Ce(3), two equivalent Ce(5), one Ga(1), one Ga(3), and one Al(2) atom. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(4), two equivalent Ce(6), one Ga(2), one Al(1), and one Al(3) atom. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(3), two equivalent Ce(5), one Ga(2), one Ga(3), and one Al(2) atom. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to two equivalent Ce(2), two equivalent Ce(4), two equivalent Ce(6), one Ga(1), one Al(1), and one Al(3) atom. In the fifth Ni site, Ni(5) is bonded in a 9-coordinate geometry to one Ce(1), one Ce(3), one Ce(6), two equivalent Ga(2), two equivalent Al(1), and two equivalent Al(2) atoms. In the sixth Ni site, Ni(6) is bonded in a 9-coordinate geometry to one Ce(2), one Ce(4), one Ce(5), two equivalent Ga(1), two equivalent Ga(3), and two equivalent Al(3) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent Ce(2), two equivalent Ce(4), two equivalent Ce(5), one Ni(1), one Ni(4), two equivalent Ni(6), one Ga(3), and one Al(3) atom to form distorted GaCe6AlGaNi4 cuboctahedra that share corners with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra, corners with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra, edges with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra, edges with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra, faces with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, faces with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra, and faces with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra. In the second Ga site, Ga(2) is bonded to two equivalent Ce(1), two equivalent Ce(3), two equivalent Ce(6), one Ni(2), one Ni(3), two equivalent Ni(5), one Al(1), and one Al(2) atom to form GaCe6Al2Ni4 cuboctahedra that share corners with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra, corners with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra,  a faceface with one Ga(3)Ce6AlGaNi4 cuboctahedra,  a faceface with one Al(3)Ce6Ga2Ni4 cuboctahedra, and faces with two equivalent Ga(2)Ce6Al2Ni4 cuboctahedra. In the third Ga site, Ga(3) is bonded to two equivalent Ce(2), two equivalent Ce(3), two equivalent Ce(5), one Ni(1), one Ni(3), two equivalent Ni(6), one Ga(1), and one Al(3) atom to form distorted GaCe6AlGaNi4 cuboctahedra that share corners with two equivalent Ga(2)Ce6Al2Ni4 cuboctahedra, corners with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, edges with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, edges with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra,  a faceface with one Ga(2)Ce6Al2Ni4 cuboctahedra,  a faceface with one Al(3)Ce6Ga2Ni4 cuboctahedra, faces with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, and faces with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Ce(4), two equivalent Ce(6), one Ni(2), one Ni(4), two equivalent Ni(5), one Ga(2), and one Al(2) atom. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Ce(3), two equivalent Ce(5), one Ni(1), one Ni(3), two equivalent Ni(5), one Ga(2), and one Al(1) atom. In the third Al site, Al(3) is bonded to two equivalent Ce(2), two equivalent Ce(4), two equivalent Ce(6), one Ni(2), one Ni(4), two equivalent Ni(6), one Ga(1), and one Ga(3) atom to form distorted AlCe6Ga2Ni4 cuboctahedra that share corners with two equivalent Ga(2)Ce6Al2Ni4 cuboctahedra, corners with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, edges with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, edges with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra,  a faceface with one Ga(2)Ce6Al2Ni4 cuboctahedra,  a faceface with one Ga(3)Ce6AlGaNi4 cuboctahedra, faces with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, and faces with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra.
Ce2Ni2GaAl crystallizes in the monoclinic Pm space group. There are six inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 11-coordinate geometry to one Ni(5), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ga(2), two equivalent Al(1), and two equivalent Al(2) atoms. The Ce(1)-Ni(5) bond length is 2.94 Å. Both Ce(1)-Ni(2) bond lengths are 2.88 Å. Both Ce(1)-Ni(3) bond lengths are 2.87 Å. Both Ce(1)-Ga(2) bond lengths are 3.10 Å. Both Ce(1)-Al(1) bond lengths are 3.26 Å. Both Ce(1)-Al(2) bond lengths are 3.27 Å. In the second Ce site, Ce(2) is bonded in a 11-coordinate geometry to one Ni(6), two equivalent Ni(1), two equivalent Ni(4), two equivalent Ga(1), two equivalent Ga(3), and two equivalent Al(3) atoms. The Ce(2)-Ni(6) bond length is 2.94 Å. Both Ce(2)-Ni(1) bond lengths are 2.89 Å. Both Ce(2)-Ni(4) bond lengths are 2.89 Å. Both Ce(2)-Ga(1) bond lengths are 3.10 Å. Both Ce(2)-Ga(3) bond lengths are 3.24 Å. Both Ce(2)-Al(3) bond lengths are 3.26 Å. In the third Ce site, Ce(3) is bonded in a 11-coordinate geometry to one Ni(5), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ga(2), two equivalent Ga(3), and two equivalent Al(2) atoms. The Ce(3)-Ni(5) bond length is 2.96 Å. Both Ce(3)-Ni(1) bond lengths are 2.87 Å. Both Ce(3)-Ni(3) bond lengths are 2.89 Å. Both Ce(3)-Ga(2) bond lengths are 3.24 Å. Both Ce(3)-Ga(3) bond lengths are 3.10 Å. Both Ce(3)-Al(2) bond lengths are 3.26 Å. In the fourth Ce site, Ce(4) is bonded in a 11-coordinate geometry to one Ni(6), two equivalent Ni(2), two equivalent Ni(4), two equivalent Ga(1), two equivalent Al(1), and two equivalent Al(3) atoms. The Ce(4)-Ni(6) bond length is 2.92 Å. Both Ce(4)-Ni(2) bond lengths are 2.87 Å. Both Ce(4)-Ni(4) bond lengths are 2.89 Å. Both Ce(4)-Ga(1) bond lengths are 3.23 Å. Both Ce(4)-Al(1) bond lengths are 3.13 Å. Both Ce(4)-Al(3) bond lengths are 3.25 Å. In the fifth Ce site, Ce(5) is bonded in a 11-coordinate geometry to one Ni(6), two equivalent Ni(1), two equivalent Ni(3), two equivalent Ga(1), two equivalent Ga(3), and two equivalent Al(2) atoms. The Ce(5)-Ni(6) bond length is 2.93 Å. Both Ce(5)-Ni(1) bond lengths are 2.89 Å. Both Ce(5)-Ni(3) bond lengths are 2.89 Å. Both Ce(5)-Ga(1) bond lengths are 3.23 Å. Both Ce(5)-Ga(3) bond lengths are 3.23 Å. Both Ce(5)-Al(2) bond lengths are 3.13 Å. In the sixth Ce site, Ce(6) is bonded in a 11-coordinate geometry to one Ni(5), two equivalent Ni(2), two equivalent Ni(4), two equivalent Ga(2), two equivalent Al(1), and two equivalent Al(3) atoms. The Ce(6)-Ni(5) bond length is 2.94 Å. Both Ce(6)-Ni(2) bond lengths are 2.90 Å. Both Ce(6)-Ni(4) bond lengths are 2.88 Å. Both Ce(6)-Ga(2) bond lengths are 3.24 Å. Both Ce(6)-Al(1) bond lengths are 3.24 Å. Both Ce(6)-Al(3) bond lengths are 3.13 Å. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to two equivalent Ce(2), two equivalent Ce(3), two equivalent Ce(5), one Ga(1), one Ga(3), and one Al(2) atom. The Ni(1)-Ga(1) bond length is 2.72 Å. The Ni(1)-Ga(3) bond length is 2.73 Å. The Ni(1)-Al(2) bond length is 2.71 Å. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(4), two equivalent Ce(6), one Ga(2), one Al(1), and one Al(3) atom. The Ni(2)-Ga(2) bond length is 2.74 Å. The Ni(2)-Al(1) bond length is 2.73 Å. The Ni(2)-Al(3) bond length is 2.73 Å. In the third Ni site, Ni(3) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(3), two equivalent Ce(5), one Ga(2), one Ga(3), and one Al(2) atom. The Ni(3)-Ga(2) bond length is 2.73 Å. The Ni(3)-Ga(3) bond length is 2.72 Å. The Ni(3)-Al(2) bond length is 2.72 Å. In the fourth Ni site, Ni(4) is bonded in a 9-coordinate geometry to two equivalent Ce(2), two equivalent Ce(4), two equivalent Ce(6), one Ga(1), one Al(1), and one Al(3) atom. The Ni(4)-Ga(1) bond length is 2.74 Å. The Ni(4)-Al(1) bond length is 2.72 Å. The Ni(4)-Al(3) bond length is 2.73 Å. In the fifth Ni site, Ni(5) is bonded in a 9-coordinate geometry to one Ce(1), one Ce(3), one Ce(6), two equivalent Ga(2), two equivalent Al(1), and two equivalent Al(2) atoms. Both Ni(5)-Ga(2) bond lengths are 2.60 Å. Both Ni(5)-Al(1) bond lengths are 2.56 Å. Both Ni(5)-Al(2) bond lengths are 2.56 Å. In the sixth Ni site, Ni(6) is bonded in a 9-coordinate geometry to one Ce(2), one Ce(4), one Ce(5), two equivalent Ga(1), two equivalent Ga(3), and two equivalent Al(3) atoms. Both Ni(6)-Ga(1) bond lengths are 2.59 Å. Both Ni(6)-Ga(3) bond lengths are 2.59 Å. Both Ni(6)-Al(3) bond lengths are 2.55 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent Ce(2), two equivalent Ce(4), two equivalent Ce(5), one Ni(1), one Ni(4), two equivalent Ni(6), one Ga(3), and one Al(3) atom to form distorted GaCe6AlGaNi4 cuboctahedra that share corners with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra, corners with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra, edges with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra, edges with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra, faces with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, faces with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra, and faces with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra. The Ga(1)-Ga(3) bond length is 2.82 Å. The Ga(1)-Al(3) bond length is 2.78 Å. In the second Ga site, Ga(2) is bonded to two equivalent Ce(1), two equivalent Ce(3), two equivalent Ce(6), one Ni(2), one Ni(3), two equivalent Ni(5), one Al(1), and one Al(2) atom to form GaCe6Al2Ni4 cuboctahedra that share corners with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra, corners with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra,  a faceface with one Ga(3)Ce6AlGaNi4 cuboctahedra,  a faceface with one Al(3)Ce6Ga2Ni4 cuboctahedra, and faces with two equivalent Ga(2)Ce6Al2Ni4 cuboctahedra. The Ga(2)-Al(1) bond length is 2.79 Å. The Ga(2)-Al(2) bond length is 2.78 Å. In the third Ga site, Ga(3) is bonded to two equivalent Ce(2), two equivalent Ce(3), two equivalent Ce(5), one Ni(1), one Ni(3), two equivalent Ni(6), one Ga(1), and one Al(3) atom to form distorted GaCe6AlGaNi4 cuboctahedra that share corners with two equivalent Ga(2)Ce6Al2Ni4 cuboctahedra, corners with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, edges with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, edges with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra,  a faceface with one Ga(2)Ce6Al2Ni4 cuboctahedra,  a faceface with one Al(3)Ce6Ga2Ni4 cuboctahedra, faces with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, and faces with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra. The Ga(3)-Al(3) bond length is 2.77 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Ce(4), two equivalent Ce(6), one Ni(2), one Ni(4), two equivalent Ni(5), one Ga(2), and one Al(2) atom. The Al(1)-Al(2) bond length is 2.77 Å. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Ce(3), two equivalent Ce(5), one Ni(1), one Ni(3), two equivalent Ni(5), one Ga(2), and one Al(1) atom. In the third Al site, Al(3) is bonded to two equivalent Ce(2), two equivalent Ce(4), two equivalent Ce(6), one Ni(2), one Ni(4), two equivalent Ni(6), one Ga(1), and one Ga(3) atom to form distorted AlCe6Ga2Ni4 cuboctahedra that share corners with two equivalent Ga(2)Ce6Al2Ni4 cuboctahedra, corners with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, edges with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, edges with two equivalent Ga(3)Ce6AlGaNi4 cuboctahedra,  a faceface with one Ga(2)Ce6Al2Ni4 cuboctahedra,  a faceface with one Ga(3)Ce6AlGaNi4 cuboctahedra, faces with two equivalent Ga(1)Ce6AlGaNi4 cuboctahedra, and faces with two equivalent Al(3)Ce6Ga2Ni4 cuboctahedra.