Ce(FeGa4)2 crystallizes in the orthorhombic Pbam space group. Ce(1) is bonded in a 13-coordinate geometry to one Ga(1), two equivalent Ga(3), two equivalent Ga(4), two equivalent Ga(5), two equivalent Ga(7), two equivalent Ga(8), and two equivalent Ga(9) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 9-coordinate geometry to one Ga(1), one Ga(6), one Ga(7), two equivalent Ga(3), two equivalent Ga(8), and two equivalent Ga(9) atoms. In the second Fe site, Fe(2) is bonded in a 9-coordinate geometry to one Ga(7), two equivalent Ga(2), two equivalent Ga(4), two equivalent Ga(5), and two equivalent Ga(6) atoms. There are nine inequivalent Ga sites. In the first Ga site, Ga(9) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Fe(1), one Ga(3), one Ga(4), two equivalent Ga(1), two equivalent Ga(7), and two equivalent Ga(8) atoms. In the second Ga site, Ga(1) is bonded to two equivalent Ce(1), two equivalent Fe(1), four equivalent Ga(8), and four equivalent Ga(9) atoms to form a mixture of distorted corner and face-sharing GaCe2Ga8Fe2 cuboctahedra. In the third Ga site, Ga(2) is bonded to four equivalent Fe(2), two equivalent Ga(4), two equivalent Ga(5), and four equivalent Ga(6) atoms to form distorted GaGa8Fe4 cuboctahedra that share faces with two equivalent Ga(2)Ga8Fe4 cuboctahedra and faces with four equivalent Ga(7)Ce2Ga8Fe2 cuboctahedra. In the fourth Ga site, Ga(3) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Fe(1), one Ga(4), one Ga(5), one Ga(8), one Ga(9), two equivalent Ga(6), and two equivalent Ga(7) atoms. In the fifth Ga site, Ga(4) is bonded in a 10-coordinate geometry to two equivalent Ce(1), two equivalent Fe(2), one Ga(2), one Ga(3), one Ga(5), one Ga(9), and two equivalent Ga(7) atoms. In the sixth Ga site, Ga(5) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Fe(2), one Ga(2), one Ga(3), one Ga(4), one Ga(8), two equivalent Ga(6), and two equivalent Ga(7) atoms. In the seventh Ga site, Ga(6) is bonded in a 3-coordinate geometry to one Fe(1), two equivalent Fe(2), two equivalent Ga(2), two equivalent Ga(3), two equivalent Ga(5), and two equivalent Ga(8) atoms. In the eighth Ga site, Ga(7) is bonded to two equivalent Ce(1), one Fe(1), one Fe(2), two equivalent Ga(3), two equivalent Ga(4), two equivalent Ga(5), and two equivalent Ga(9) atoms to form distorted GaCe2Ga8Fe2 cuboctahedra that share corners with two equivalent Ga(7)Ce2Ga8Fe2 cuboctahedra, corners with three equivalent Ga(1)Ce2Ga8Fe2 cuboctahedra,  a faceface with one Ga(1)Ce2Ga8Fe2 cuboctahedra, faces with two equivalent Ga(7)Ce2Ga8Fe2 cuboctahedra, and faces with two equivalent Ga(2)Ga8Fe4 cuboctahedra. In the ninth Ga site, Ga(8) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Fe(1), one Ga(3), one Ga(5), two equivalent Ga(1), two equivalent Ga(6), and two equivalent Ga(9) atoms.
Ce(FeGa4)2 crystallizes in the orthorhombic Pbam space group. Ce(1) is bonded in a 13-coordinate geometry to one Ga(1), two equivalent Ga(3), two equivalent Ga(4), two equivalent Ga(5), two equivalent Ga(7), two equivalent Ga(8), and two equivalent Ga(9) atoms. The Ce(1)-Ga(1) bond length is 3.24 Å. Both Ce(1)-Ga(3) bond lengths are 3.18 Å. Both Ce(1)-Ga(4) bond lengths are 3.13 Å. Both Ce(1)-Ga(5) bond lengths are 3.13 Å. There is one shorter (3.20 Å) and one longer (3.37 Å) Ce(1)-Ga(7) bond length. Both Ce(1)-Ga(8) bond lengths are 3.17 Å. Both Ce(1)-Ga(9) bond lengths are 3.11 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 9-coordinate geometry to one Ga(1), one Ga(6), one Ga(7), two equivalent Ga(3), two equivalent Ga(8), and two equivalent Ga(9) atoms. The Fe(1)-Ga(1) bond length is 2.36 Å. The Fe(1)-Ga(6) bond length is 2.43 Å. The Fe(1)-Ga(7) bond length is 2.35 Å. Both Fe(1)-Ga(3) bond lengths are 2.55 Å. Both Fe(1)-Ga(8) bond lengths are 2.55 Å. Both Fe(1)-Ga(9) bond lengths are 2.64 Å. In the second Fe site, Fe(2) is bonded in a 9-coordinate geometry to one Ga(7), two equivalent Ga(2), two equivalent Ga(4), two equivalent Ga(5), and two equivalent Ga(6) atoms. The Fe(2)-Ga(7) bond length is 2.33 Å. Both Fe(2)-Ga(2) bond lengths are 2.46 Å. Both Fe(2)-Ga(4) bond lengths are 2.62 Å. Both Fe(2)-Ga(5) bond lengths are 2.64 Å. Both Fe(2)-Ga(6) bond lengths are 2.55 Å. There are nine inequivalent Ga sites. In the first Ga site, Ga(9) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Fe(1), one Ga(3), one Ga(4), two equivalent Ga(1), two equivalent Ga(7), and two equivalent Ga(8) atoms. The Ga(9)-Ga(3) bond length is 2.76 Å. The Ga(9)-Ga(4) bond length is 2.78 Å. Both Ga(9)-Ga(1) bond lengths are 2.80 Å. Both Ga(9)-Ga(7) bond lengths are 2.82 Å. There is one shorter (2.73 Å) and one longer (2.97 Å) Ga(9)-Ga(8) bond length. In the second Ga site, Ga(1) is bonded to two equivalent Ce(1), two equivalent Fe(1), four equivalent Ga(8), and four equivalent Ga(9) atoms to form a mixture of distorted corner and face-sharing GaCe2Ga8Fe2 cuboctahedra. All Ga(1)-Ga(8) bond lengths are 2.92 Å. In the third Ga site, Ga(2) is bonded to four equivalent Fe(2), two equivalent Ga(4), two equivalent Ga(5), and four equivalent Ga(6) atoms to form distorted GaGa8Fe4 cuboctahedra that share faces with two equivalent Ga(2)Ga8Fe4 cuboctahedra and faces with four equivalent Ga(7)Ce2Ga8Fe2 cuboctahedra. Both Ga(2)-Ga(4) bond lengths are 2.68 Å. Both Ga(2)-Ga(5) bond lengths are 2.70 Å. All Ga(2)-Ga(6) bond lengths are 2.95 Å. In the fourth Ga site, Ga(3) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Fe(1), one Ga(4), one Ga(5), one Ga(8), one Ga(9), two equivalent Ga(6), and two equivalent Ga(7) atoms. The Ga(3)-Ga(4) bond length is 2.67 Å. The Ga(3)-Ga(5) bond length is 3.04 Å. The Ga(3)-Ga(8) bond length is 2.79 Å. Both Ga(3)-Ga(6) bond lengths are 3.01 Å. Both Ga(3)-Ga(7) bond lengths are 2.91 Å. In the fifth Ga site, Ga(4) is bonded in a 10-coordinate geometry to two equivalent Ce(1), two equivalent Fe(2), one Ga(2), one Ga(3), one Ga(5), one Ga(9), and two equivalent Ga(7) atoms. The Ga(4)-Ga(5) bond length is 2.81 Å. Both Ga(4)-Ga(7) bond lengths are 2.89 Å. In the sixth Ga site, Ga(5) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Fe(2), one Ga(2), one Ga(3), one Ga(4), one Ga(8), two equivalent Ga(6), and two equivalent Ga(7) atoms. The Ga(5)-Ga(8) bond length is 2.64 Å. Both Ga(5)-Ga(6) bond lengths are 3.14 Å. Both Ga(5)-Ga(7) bond lengths are 2.81 Å. In the seventh Ga site, Ga(6) is bonded in a 3-coordinate geometry to one Fe(1), two equivalent Fe(2), two equivalent Ga(2), two equivalent Ga(3), two equivalent Ga(5), and two equivalent Ga(8) atoms. Both Ga(6)-Ga(8) bond lengths are 3.04 Å. In the eighth Ga site, Ga(7) is bonded to two equivalent Ce(1), one Fe(1), one Fe(2), two equivalent Ga(3), two equivalent Ga(4), two equivalent Ga(5), and two equivalent Ga(9) atoms to form distorted GaCe2Ga8Fe2 cuboctahedra that share corners with two equivalent Ga(7)Ce2Ga8Fe2 cuboctahedra, corners with three equivalent Ga(1)Ce2Ga8Fe2 cuboctahedra,  a faceface with one Ga(1)Ce2Ga8Fe2 cuboctahedra, faces with two equivalent Ga(7)Ce2Ga8Fe2 cuboctahedra, and faces with two equivalent Ga(2)Ga8Fe4 cuboctahedra. In the ninth Ga site, Ga(8) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Fe(1), one Ga(3), one Ga(5), two equivalent Ga(1), two equivalent Ga(6), and two equivalent Ga(9) atoms.