Cu3Ge is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to eight Cu(1,1) and four equivalent Ge(1) atoms to form CuCu8Ge4 cuboctahedra that share corners with four equivalent Ge(1)Cu12 cuboctahedra; corners with fourteen equivalent Cu(1)Cu8Ge4 cuboctahedra; edges with six equivalent Ge(1)Cu12 cuboctahedra; edges with twelve Cu(1,1)Cu8Ge4 cuboctahedra; faces with four equivalent Ge(1)Cu12 cuboctahedra; and faces with sixteen Cu(1,1)Cu8Ge4 cuboctahedra. In the second Cu site, Cu(1) is bonded to eight equivalent Cu(1) and four equivalent Ge(1) atoms to form CuCu8Ge4 cuboctahedra that share corners with four equivalent Ge(1)Cu12 cuboctahedra; corners with fourteen Cu(1,1)Cu8Ge4 cuboctahedra; edges with six equivalent Ge(1)Cu12 cuboctahedra; edges with twelve equivalent Cu(1)Cu8Ge4 cuboctahedra; faces with four equivalent Ge(1)Cu12 cuboctahedra; and faces with sixteen Cu(1,1)Cu8Ge4 cuboctahedra. Ge(1) is bonded to twelve Cu(1,1) atoms to form GeCu12 cuboctahedra that share corners with six equivalent Ge(1)Cu12 cuboctahedra; corners with twelve Cu(1,1)Cu8Ge4 cuboctahedra; edges with eighteen Cu(1,1)Cu8Ge4 cuboctahedra; faces with eight equivalent Ge(1)Cu12 cuboctahedra; and faces with twelve Cu(1,1)Cu8Ge4 cuboctahedra.
Cu3Ge is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to eight Cu(1,1) and four equivalent Ge(1) atoms to form CuCu8Ge4 cuboctahedra that share corners with four equivalent Ge(1)Cu12 cuboctahedra; corners with fourteen equivalent Cu(1)Cu8Ge4 cuboctahedra; edges with six equivalent Ge(1)Cu12 cuboctahedra; edges with twelve Cu(1,1)Cu8Ge4 cuboctahedra; faces with four equivalent Ge(1)Cu12 cuboctahedra; and faces with sixteen Cu(1,1)Cu8Ge4 cuboctahedra. There are a spread of Cu(1)-Cu(1,1) bond distances ranging from 2.56-2.65 Å. There are two shorter (2.58 Å) and two longer (2.62 Å) Cu(1)-Ge(1) bond lengths. In the second Cu site, Cu(1) is bonded to eight equivalent Cu(1) and four equivalent Ge(1) atoms to form CuCu8Ge4 cuboctahedra that share corners with four equivalent Ge(1)Cu12 cuboctahedra; corners with fourteen Cu(1,1)Cu8Ge4 cuboctahedra; edges with six equivalent Ge(1)Cu12 cuboctahedra; edges with twelve equivalent Cu(1)Cu8Ge4 cuboctahedra; faces with four equivalent Ge(1)Cu12 cuboctahedra; and faces with sixteen Cu(1,1)Cu8Ge4 cuboctahedra. There are two shorter (2.58 Å) and two longer (2.62 Å) Cu(1)-Ge(1) bond lengths. Ge(1) is bonded to twelve Cu(1,1) atoms to form GeCu12 cuboctahedra that share corners with six equivalent Ge(1)Cu12 cuboctahedra; corners with twelve Cu(1,1)Cu8Ge4 cuboctahedra; edges with eighteen Cu(1,1)Cu8Ge4 cuboctahedra; faces with eight equivalent Ge(1)Cu12 cuboctahedra; and faces with twelve Cu(1,1)Cu8Ge4 cuboctahedra.