CeCo9Ga4 crystallizes in the tetragonal I4/mcm space group. Ce(1) is bonded in a 24-coordinate geometry to eight equivalent Co(1), eight equivalent Co(3), and eight equivalent Ga(1) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 12-coordinate geometry to two equivalent Ce(1), one Co(2), two equivalent Co(3), three equivalent Co(1), and four equivalent Ga(1) atoms. In the second Co site, Co(2) is bonded to four equivalent Co(1), four equivalent Co(3), and four equivalent Ga(1) atoms to form a mixture of corner and face-sharing CoGa4Co8 cuboctahedra. In the third Co site, Co(3) is bonded to two equivalent Ce(1), one Co(2), two equivalent Co(1), three equivalent Co(3), and four equivalent Ga(1) atoms to form distorted CoCe2Ga4Co6 cuboctahedra that share  a cornercorner with one Co(2)Ga4Co8 cuboctahedra, corners with seven equivalent Co(3)Ce2Ga4Co6 cuboctahedra, edges with four equivalent Co(3)Ce2Ga4Co6 cuboctahedra, faces with two equivalent Co(2)Ga4Co8 cuboctahedra, and faces with five equivalent Co(3)Ce2Ga4Co6 cuboctahedra. Ga(1) is bonded in a 11-coordinate geometry to two equivalent Ce(1), one Co(2), four equivalent Co(1), and four equivalent Co(3) atoms.
CeCo9Ga4 crystallizes in the tetragonal I4/mcm space group. Ce(1) is bonded in a 24-coordinate geometry to eight equivalent Co(1), eight equivalent Co(3), and eight equivalent Ga(1) atoms. All Ce(1)-Co(1) bond lengths are 3.36 Å. All Ce(1)-Co(3) bond lengths are 3.32 Å. All Ce(1)-Ga(1) bond lengths are 3.27 Å. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 12-coordinate geometry to two equivalent Ce(1), one Co(2), two equivalent Co(3), three equivalent Co(1), and four equivalent Ga(1) atoms. The Co(1)-Co(2) bond length is 2.43 Å. Both Co(1)-Co(3) bond lengths are 2.56 Å. There are two shorter (2.36 Å) and one longer (2.67 Å) Co(1)-Co(1) bond length. There are two shorter (2.52 Å) and two longer (2.59 Å) Co(1)-Ga(1) bond lengths. In the second Co site, Co(2) is bonded to four equivalent Co(1), four equivalent Co(3), and four equivalent Ga(1) atoms to form a mixture of corner and face-sharing CoGa4Co8 cuboctahedra. All Co(2)-Co(3) bond lengths are 2.41 Å. All Co(2)-Ga(1) bond lengths are 2.50 Å. In the third Co site, Co(3) is bonded to two equivalent Ce(1), one Co(2), two equivalent Co(1), three equivalent Co(3), and four equivalent Ga(1) atoms to form distorted CoCe2Ga4Co6 cuboctahedra that share  a cornercorner with one Co(2)Ga4Co8 cuboctahedra, corners with seven equivalent Co(3)Ce2Ga4Co6 cuboctahedra, edges with four equivalent Co(3)Ce2Ga4Co6 cuboctahedra, faces with two equivalent Co(2)Ga4Co8 cuboctahedra, and faces with five equivalent Co(3)Ce2Ga4Co6 cuboctahedra. There are two shorter (2.51 Å) and one longer (2.55 Å) Co(3)-Co(3) bond length. There are a spread of Co(3)-Ga(1) bond distances ranging from 2.39-2.47 Å. Ga(1) is bonded in a 11-coordinate geometry to two equivalent Ce(1), one Co(2), four equivalent Co(1), and four equivalent Co(3) atoms.