CeCu4Ga crystallizes in the hexagonal P-6m2 space group. Ce(1) is bonded in a 18-coordinate geometry to three equivalent Cu(1), twelve equivalent Cu(2), and three equivalent Ga(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to three equivalent Ce(1), six equivalent Cu(2), and three equivalent Ga(1) atoms to form distorted CuCe3Ga3Cu6 cuboctahedra that share corners with nine equivalent Ga(1)Ce3Cu9 cuboctahedra, corners with twelve equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra, edges with six equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, faces with two equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, faces with three equivalent Ga(1)Ce3Cu9 cuboctahedra, and faces with eighteen equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra. In the second Cu site, Cu(2) is bonded to four equivalent Ce(1), two equivalent Cu(1), four equivalent Cu(2), and two equivalent Ga(1) atoms to form CuCe4Ga2Cu6 cuboctahedra that share corners with four equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, corners with four equivalent Ga(1)Ce3Cu9 cuboctahedra, corners with sixteen equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra, edges with ten equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra, faces with six equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, faces with six equivalent Ga(1)Ce3Cu9 cuboctahedra, and faces with ten equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra. Ga(1) is bonded to three equivalent Ce(1), three equivalent Cu(1), and six equivalent Cu(2) atoms to form distorted GaCe3Cu9 cuboctahedra that share corners with nine equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, corners with twelve equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra, edges with six equivalent Ga(1)Ce3Cu9 cuboctahedra, faces with two equivalent Ga(1)Ce3Cu9 cuboctahedra, faces with three equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, and faces with eighteen equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra.
CeCu4Ga crystallizes in the hexagonal P-6m2 space group. Ce(1) is bonded in a 18-coordinate geometry to three equivalent Cu(1), twelve equivalent Cu(2), and three equivalent Ga(1) atoms. All Ce(1)-Cu(1) bond lengths are 3.02 Å. All Ce(1)-Cu(2) bond lengths are 3.31 Å. All Ce(1)-Ga(1) bond lengths are 3.02 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to three equivalent Ce(1), six equivalent Cu(2), and three equivalent Ga(1) atoms to form distorted CuCe3Ga3Cu6 cuboctahedra that share corners with nine equivalent Ga(1)Ce3Cu9 cuboctahedra, corners with twelve equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra, edges with six equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, faces with two equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, faces with three equivalent Ga(1)Ce3Cu9 cuboctahedra, and faces with eighteen equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra. All Cu(1)-Cu(2) bond lengths are 2.52 Å. All Cu(1)-Ga(1) bond lengths are 3.02 Å. In the second Cu site, Cu(2) is bonded to four equivalent Ce(1), two equivalent Cu(1), four equivalent Cu(2), and two equivalent Ga(1) atoms to form CuCe4Ga2Cu6 cuboctahedra that share corners with four equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, corners with four equivalent Ga(1)Ce3Cu9 cuboctahedra, corners with sixteen equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra, edges with ten equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra, faces with six equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, faces with six equivalent Ga(1)Ce3Cu9 cuboctahedra, and faces with ten equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra. There are two shorter (2.59 Å) and two longer (2.65 Å) Cu(2)-Cu(2) bond lengths. Both Cu(2)-Ga(1) bond lengths are 2.54 Å. Ga(1) is bonded to three equivalent Ce(1), three equivalent Cu(1), and six equivalent Cu(2) atoms to form distorted GaCe3Cu9 cuboctahedra that share corners with nine equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, corners with twelve equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra, edges with six equivalent Ga(1)Ce3Cu9 cuboctahedra, faces with two equivalent Ga(1)Ce3Cu9 cuboctahedra, faces with three equivalent Cu(1)Ce3Ga3Cu6 cuboctahedra, and faces with eighteen equivalent Cu(2)Ce4Ga2Cu6 cuboctahedra.