Co4Ga is alpha La-derived structured and crystallizes in the trigonal R-3m space group. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to three equivalent Co(2), six equivalent Co(1), and three equivalent Ga(1) atoms to form CoGa3Co9 cuboctahedra that share corners with three equivalent Co(2)Co12 cuboctahedra, corners with nine equivalent Co(1)Ga3Co9 cuboctahedra, edges with six equivalent Ga(1)Ga6Co6 cuboctahedra, edges with nine equivalent Co(2)Co12 cuboctahedra, edges with nine equivalent Co(1)Ga3Co9 cuboctahedra, faces with six equivalent Co(2)Co12 cuboctahedra, faces with six equivalent Co(1)Ga3Co9 cuboctahedra, and faces with six equivalent Ga(1)Ga6Co6 cuboctahedra. In the second Co site, Co(2) is bonded to three equivalent Co(1) and nine equivalent Co(2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Co(1)Ga3Co9 cuboctahedra, corners with three equivalent Ga(1)Ga6Co6 cuboctahedra, corners with six equivalent Co(2)Co12 cuboctahedra, edges with three equivalent Ga(1)Ga6Co6 cuboctahedra, edges with nine equivalent Co(1)Ga3Co9 cuboctahedra, edges with twelve equivalent Co(2)Co12 cuboctahedra, faces with six equivalent Co(1)Ga3Co9 cuboctahedra, and faces with twelve equivalent Co(2)Co12 cuboctahedra. In the third Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Co(1)Ga3Co9 cuboctahedra; corners with three equivalent Ga(1)Ga6Co6 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ga(1)Ga6Co6 cuboctahedra; edges with nine equivalent Co(1)Ga3Co9 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Ga3Co9 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. In the fourth Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Co(1)Ga3Co9 cuboctahedra; corners with three equivalent Ga(1)Ga6Co6 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ga(1)Ga6Co6 cuboctahedra; edges with nine equivalent Co(1)Ga3Co9 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Ga3Co9 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. In the fifth Co site, Co(2) is bonded to three equivalent Co(1) and nine equivalent Co(2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Co(1)Ga3Co9 cuboctahedra, corners with three equivalent Ga(1)Ga6Co6 cuboctahedra, corners with six equivalent Co(2)Co12 cuboctahedra, edges with three equivalent Ga(1)Ga6Co6 cuboctahedra, edges with nine equivalent Co(1)Ga3Co9 cuboctahedra, edges with twelve equivalent Co(2)Co12 cuboctahedra, faces with six equivalent Co(1)Ga3Co9 cuboctahedra, and faces with twelve equivalent Co(2)Co12 cuboctahedra. Ga(1) is bonded to six equivalent Co(1) and six equivalent Ga(1) atoms to form GaGa6Co6 cuboctahedra that share corners with six Co(2,2)Co12 cuboctahedra; corners with six equivalent Ga(1)Ga6Co6 cuboctahedra; edges with six Co(2,2)Co12 cuboctahedra; edges with six equivalent Ga(1)Ga6Co6 cuboctahedra; edges with twelve equivalent Co(1)Ga3Co9 cuboctahedra; faces with six equivalent Ga(1)Ga6Co6 cuboctahedra; and faces with twelve equivalent Co(1)Ga3Co9 cuboctahedra.
Co4Ga is alpha La-derived structured and crystallizes in the trigonal R-3m space group. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to three equivalent Co(2), six equivalent Co(1), and three equivalent Ga(1) atoms to form CoGa3Co9 cuboctahedra that share corners with three equivalent Co(2)Co12 cuboctahedra, corners with nine equivalent Co(1)Ga3Co9 cuboctahedra, edges with six equivalent Ga(1)Ga6Co6 cuboctahedra, edges with nine equivalent Co(2)Co12 cuboctahedra, edges with nine equivalent Co(1)Ga3Co9 cuboctahedra, faces with six equivalent Co(2)Co12 cuboctahedra, faces with six equivalent Co(1)Ga3Co9 cuboctahedra, and faces with six equivalent Ga(1)Ga6Co6 cuboctahedra. All Co(1)-Co(2) bond lengths are 2.45 Å. All Co(1)-Co(1) bond lengths are 2.59 Å. All Co(1)-Ga(1) bond lengths are 2.55 Å. In the second Co site, Co(2) is bonded to three equivalent Co(1) and nine equivalent Co(2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Co(1)Ga3Co9 cuboctahedra, corners with three equivalent Ga(1)Ga6Co6 cuboctahedra, corners with six equivalent Co(2)Co12 cuboctahedra, edges with three equivalent Ga(1)Ga6Co6 cuboctahedra, edges with nine equivalent Co(1)Ga3Co9 cuboctahedra, edges with twelve equivalent Co(2)Co12 cuboctahedra, faces with six equivalent Co(1)Ga3Co9 cuboctahedra, and faces with twelve equivalent Co(2)Co12 cuboctahedra. There are three shorter (2.51 Å) and six longer (2.59 Å) Co(2)-Co(2) bond lengths. In the third Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Co(1)Ga3Co9 cuboctahedra; corners with three equivalent Ga(1)Ga6Co6 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ga(1)Ga6Co6 cuboctahedra; edges with nine equivalent Co(1)Ga3Co9 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Ga3Co9 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. All Co(2)-Co(1) bond lengths are 2.45 Å. There are three shorter (2.51 Å) and six longer (2.59 Å) Co(2)-Co(2,2) bond lengths. In the fourth Co site, Co(2) is bonded to three equivalent Co(1) and nine Co(2,2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Co(1)Ga3Co9 cuboctahedra; corners with three equivalent Ga(1)Ga6Co6 cuboctahedra; corners with six equivalent Co(2)Co12 cuboctahedra; edges with three equivalent Ga(1)Ga6Co6 cuboctahedra; edges with nine equivalent Co(1)Ga3Co9 cuboctahedra; edges with twelve Co(2,2)Co12 cuboctahedra; faces with six equivalent Co(1)Ga3Co9 cuboctahedra; and faces with twelve Co(2,2)Co12 cuboctahedra. All Co(2)-Co(1) bond lengths are 2.45 Å. All Co(2)-Co(2) bond lengths are 2.59 Å. In the fifth Co site, Co(2) is bonded to three equivalent Co(1) and nine equivalent Co(2) atoms to form CoCo12 cuboctahedra that share corners with three equivalent Co(1)Ga3Co9 cuboctahedra, corners with three equivalent Ga(1)Ga6Co6 cuboctahedra, corners with six equivalent Co(2)Co12 cuboctahedra, edges with three equivalent Ga(1)Ga6Co6 cuboctahedra, edges with nine equivalent Co(1)Ga3Co9 cuboctahedra, edges with twelve equivalent Co(2)Co12 cuboctahedra, faces with six equivalent Co(1)Ga3Co9 cuboctahedra, and faces with twelve equivalent Co(2)Co12 cuboctahedra. All Co(2)-Co(1) bond lengths are 2.45 Å. There are three shorter (2.51 Å) and six longer (2.59 Å) Co(2)-Co(2) bond lengths. Ga(1) is bonded to six equivalent Co(1) and six equivalent Ga(1) atoms to form GaGa6Co6 cuboctahedra that share corners with six Co(2,2)Co12 cuboctahedra; corners with six equivalent Ga(1)Ga6Co6 cuboctahedra; edges with six Co(2,2)Co12 cuboctahedra; edges with six equivalent Ga(1)Ga6Co6 cuboctahedra; edges with twelve equivalent Co(1)Ga3Co9 cuboctahedra; faces with six equivalent Ga(1)Ga6Co6 cuboctahedra; and faces with twelve equivalent Co(1)Ga3Co9 cuboctahedra. All Ga(1)-Ga(1) bond lengths are 2.59 Å.