Co3Ga is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to eight equivalent Co(1) and four equivalent Ga(1) atoms to form CoGa4Co8 cuboctahedra that share corners with four equivalent Ga(1)Co12 cuboctahedra; corners with fourteen equivalent Co(1)Ga4Co8 cuboctahedra; edges with six equivalent Ga(1)Co12 cuboctahedra; edges with twelve equivalent Co(1)Ga4Co8 cuboctahedra; faces with four equivalent Ga(1)Co12 cuboctahedra; and faces with sixteen Co(1,1)Ga4Co8 cuboctahedra. In the second Co site, Co(1) is bonded to eight equivalent Co(1) and four equivalent Ga(1) atoms to form CoGa4Co8 cuboctahedra that share corners with four equivalent Ga(1)Co12 cuboctahedra; corners with fourteen Co(1,1)Ga4Co8 cuboctahedra; edges with six equivalent Ga(1)Co12 cuboctahedra; edges with twelve equivalent Co(1)Ga4Co8 cuboctahedra; faces with four equivalent Ga(1)Co12 cuboctahedra; and faces with sixteen Co(1,1)Ga4Co8 cuboctahedra. Ga(1) is bonded to twelve Co(1,1) atoms to form GaCo12 cuboctahedra that share corners with six equivalent Ga(1)Co12 cuboctahedra; corners with twelve Co(1,1)Ga4Co8 cuboctahedra; edges with eighteen Co(1,1)Ga4Co8 cuboctahedra; faces with eight equivalent Ga(1)Co12 cuboctahedra; and faces with twelve Co(1,1)Ga4Co8 cuboctahedra.
Co3Ga is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to eight equivalent Co(1) and four equivalent Ga(1) atoms to form CoGa4Co8 cuboctahedra that share corners with four equivalent Ga(1)Co12 cuboctahedra; corners with fourteen equivalent Co(1)Ga4Co8 cuboctahedra; edges with six equivalent Ga(1)Co12 cuboctahedra; edges with twelve equivalent Co(1)Ga4Co8 cuboctahedra; faces with four equivalent Ga(1)Co12 cuboctahedra; and faces with sixteen Co(1,1)Ga4Co8 cuboctahedra. There are a spread of Co(1)-Co(1) bond distances ranging from 2.52-2.56 Å. There are two shorter (2.53 Å) and two longer (2.54 Å) Co(1)-Ga(1) bond lengths. In the second Co site, Co(1) is bonded to eight equivalent Co(1) and four equivalent Ga(1) atoms to form CoGa4Co8 cuboctahedra that share corners with four equivalent Ga(1)Co12 cuboctahedra; corners with fourteen Co(1,1)Ga4Co8 cuboctahedra; edges with six equivalent Ga(1)Co12 cuboctahedra; edges with twelve equivalent Co(1)Ga4Co8 cuboctahedra; faces with four equivalent Ga(1)Co12 cuboctahedra; and faces with sixteen Co(1,1)Ga4Co8 cuboctahedra. There are a spread of Co(1)-Co(1) bond distances ranging from 2.52-2.56 Å. There are two shorter (2.53 Å) and two longer (2.54 Å) Co(1)-Ga(1) bond lengths. Ga(1) is bonded to twelve Co(1,1) atoms to form GaCo12 cuboctahedra that share corners with six equivalent Ga(1)Co12 cuboctahedra; corners with twelve Co(1,1)Ga4Co8 cuboctahedra; edges with eighteen Co(1,1)Ga4Co8 cuboctahedra; faces with eight equivalent Ga(1)Co12 cuboctahedra; and faces with twelve Co(1,1)Ga4Co8 cuboctahedra.