Au3Cu is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Au(1) is bonded to eight equivalent Au(1) and four equivalent Cu(1) atoms to form distorted AuCu4Au8 cuboctahedra that share corners with twelve equivalent Au(1)Cu4Au8 cuboctahedra, edges with eight equivalent Cu(1)Au12 cuboctahedra, edges with sixteen equivalent Au(1)Cu4Au8 cuboctahedra, faces with four equivalent Cu(1)Au12 cuboctahedra, and faces with fourteen equivalent Au(1)Cu4Au8 cuboctahedra. Cu(1) is bonded to twelve equivalent Au(1) atoms to form CuAu12 cuboctahedra that share corners with twelve equivalent Cu(1)Au12 cuboctahedra, edges with twenty-four equivalent Au(1)Cu4Au8 cuboctahedra, faces with six equivalent Cu(1)Au12 cuboctahedra, and faces with twelve equivalent Au(1)Cu4Au8 cuboctahedra.
Au3Cu is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Au(1) is bonded to eight equivalent Au(1) and four equivalent Cu(1) atoms to form distorted AuCu4Au8 cuboctahedra that share corners with twelve equivalent Au(1)Cu4Au8 cuboctahedra, edges with eight equivalent Cu(1)Au12 cuboctahedra, edges with sixteen equivalent Au(1)Cu4Au8 cuboctahedra, faces with four equivalent Cu(1)Au12 cuboctahedra, and faces with fourteen equivalent Au(1)Cu4Au8 cuboctahedra. All Au(1)-Au(1) bond lengths are 2.84 Å. All Au(1)-Cu(1) bond lengths are 2.84 Å. Cu(1) is bonded to twelve equivalent Au(1) atoms to form CuAu12 cuboctahedra that share corners with twelve equivalent Cu(1)Au12 cuboctahedra, edges with twenty-four equivalent Au(1)Cu4Au8 cuboctahedra, faces with six equivalent Cu(1)Au12 cuboctahedra, and faces with twelve equivalent Au(1)Cu4Au8 cuboctahedra.