The crystal structure described by AuCu4 crystallizes in the trigonal R-3m space group. Au(1) is bonded to six equivalent Au(1) and six equivalent Cu(1) atoms to form distorted AuCu6Au6 cuboctahedra that share corners with six equivalent Au(1)Cu6Au6 cuboctahedra; corners with six Cu(2,2)Cu12 cuboctahedra; edges with six equivalent Au(1)Cu6Au6 cuboctahedra; edges with six Cu(2,2)Cu12 cuboctahedra; edges with twelve equivalent Cu(1)Cu9Au3 cuboctahedra; faces with six equivalent Au(1)Cu6Au6 cuboctahedra; and faces with twelve equivalent Cu(1)Cu9Au3 cuboctahedra. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to three equivalent Au(1), three equivalent Cu(2), and six equivalent Cu(1) atoms to form distorted CuCu9Au3 cuboctahedra that share corners with three equivalent Cu(2)Cu12 cuboctahedra; corners with nine equivalent Cu(1)Cu9Au3 cuboctahedra; edges with six equivalent Au(1)Cu6Au6 cuboctahedra; edges with nine Cu(2,2)Cu12 cuboctahedra; edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra; faces with six equivalent Au(1)Cu6Au6 cuboctahedra; faces with six equivalent Cu(2)Cu12 cuboctahedra; and faces with six equivalent Cu(1)Cu9Au3 cuboctahedra. In the second Cu site, Cu(2) is bonded to three equivalent Cu(1) and nine Cu(2,2) atoms to form CuCu12 cuboctahedra that share corners with three equivalent Au(1)Cu6Au6 cuboctahedra; corners with three equivalent Cu(1)Cu9Au3 cuboctahedra; corners with six equivalent Cu(2)Cu12 cuboctahedra; edges with three equivalent Au(1)Cu6Au6 cuboctahedra; edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra; edges with twelve Cu(2,2)Cu12 cuboctahedra; faces with six equivalent Cu(1)Cu9Au3 cuboctahedra; and faces with twelve Cu(2,2)Cu12 cuboctahedra. In the third Cu site, Cu(2) is bonded to three equivalent Cu(1) and nine Cu(2,2) atoms to form CuCu12 cuboctahedra that share corners with three equivalent Au(1)Cu6Au6 cuboctahedra; corners with three equivalent Cu(1)Cu9Au3 cuboctahedra; corners with six equivalent Cu(2)Cu12 cuboctahedra; edges with three equivalent Au(1)Cu6Au6 cuboctahedra; edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra; edges with twelve Cu(2,2)Cu12 cuboctahedra; faces with six equivalent Cu(1)Cu9Au3 cuboctahedra; and faces with twelve Cu(2,2)Cu12 cuboctahedra. In the fourth Cu site, Cu(2) is bonded to three equivalent Cu(1) and nine equivalent Cu(2) atoms to form CuCu12 cuboctahedra that share corners with three equivalent Au(1)Cu6Au6 cuboctahedra, corners with three equivalent Cu(1)Cu9Au3 cuboctahedra, corners with six equivalent Cu(2)Cu12 cuboctahedra, edges with three equivalent Au(1)Cu6Au6 cuboctahedra, edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra, edges with twelve equivalent Cu(2)Cu12 cuboctahedra, faces with six equivalent Cu(1)Cu9Au3 cuboctahedra, and faces with twelve equivalent Cu(2)Cu12 cuboctahedra. In the fifth Cu site, Cu(2) is bonded to three equivalent Cu(1) and nine Cu(2,2) atoms to form CuCu12 cuboctahedra that share corners with three equivalent Au(1)Cu6Au6 cuboctahedra; corners with three equivalent Cu(1)Cu9Au3 cuboctahedra; corners with six equivalent Cu(2)Cu12 cuboctahedra; edges with three equivalent Au(1)Cu6Au6 cuboctahedra; edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra; edges with twelve Cu(2,2)Cu12 cuboctahedra; faces with six equivalent Cu(1)Cu9Au3 cuboctahedra; and faces with twelve Cu(2,2)Cu12 cuboctahedra. In the sixth Cu site, Cu(2) is bonded to three equivalent Cu(1) and nine Cu(2,2) atoms to form CuCu12 cuboctahedra that share corners with three equivalent Au(1)Cu6Au6 cuboctahedra; corners with three equivalent Cu(1)Cu9Au3 cuboctahedra; corners with six equivalent Cu(2)Cu12 cuboctahedra; edges with three equivalent Au(1)Cu6Au6 cuboctahedra; edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra; edges with twelve Cu(2,2)Cu12 cuboctahedra; faces with six equivalent Cu(1)Cu9Au3 cuboctahedra; and faces with twelve Cu(2,2)Cu12 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cu4Au
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.620
_cell_length_b   10.620
_cell_length_c   10.620
_cell_angle_alpha   14.655
_cell_angle_beta   14.655
_cell_angle_gamma   14.655
_symmetry_Int_Tables_number   1
_cell_volume   66.751
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Cu  Cu0  1  0.594  0.594  0.594  1.0
  Cu  Cu1  1  0.198  0.198  0.198  1.0
  Cu  Cu2  1  0.802  0.802  0.802  1.0
  Cu  Cu3  1  0.406  0.406  0.406  1.0
  Au  Au4  1  0.000  0.000  0.000  1.0
[/CIF]
.
The crystal structure described by AuCu4 crystallizes in the trigonal R-3m space group. Au(1) is bonded to six equivalent Au(1) and six equivalent Cu(1) atoms to form distorted AuCu6Au6 cuboctahedra that share corners with six equivalent Au(1)Cu6Au6 cuboctahedra; corners with six Cu(2,2)Cu12 cuboctahedra; edges with six equivalent Au(1)Cu6Au6 cuboctahedra; edges with six Cu(2,2)Cu12 cuboctahedra; edges with twelve equivalent Cu(1)Cu9Au3 cuboctahedra; faces with six equivalent Au(1)Cu6Au6 cuboctahedra; and faces with twelve equivalent Cu(1)Cu9Au3 cuboctahedra. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to three equivalent Au(1), three equivalent Cu(2), and six equivalent Cu(1) atoms to form distorted CuCu9Au3 cuboctahedra that share corners with three equivalent Cu(2)Cu12 cuboctahedra; corners with nine equivalent Cu(1)Cu9Au3 cuboctahedra; edges with six equivalent Au(1)Cu6Au6 cuboctahedra; edges with nine Cu(2,2)Cu12 cuboctahedra; edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra; faces with six equivalent Au(1)Cu6Au6 cuboctahedra; faces with six equivalent Cu(2)Cu12 cuboctahedra; and faces with six equivalent Cu(1)Cu9Au3 cuboctahedra. In the second Cu site, Cu(2) is bonded to three equivalent Cu(1) and nine Cu(2,2) atoms to form CuCu12 cuboctahedra that share corners with three equivalent Au(1)Cu6Au6 cuboctahedra; corners with three equivalent Cu(1)Cu9Au3 cuboctahedra; corners with six equivalent Cu(2)Cu12 cuboctahedra; edges with three equivalent Au(1)Cu6Au6 cuboctahedra; edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra; edges with twelve Cu(2,2)Cu12 cuboctahedra; faces with six equivalent Cu(1)Cu9Au3 cuboctahedra; and faces with twelve Cu(2,2)Cu12 cuboctahedra. In the third Cu site, Cu(2) is bonded to three equivalent Cu(1) and nine Cu(2,2) atoms to form CuCu12 cuboctahedra that share corners with three equivalent Au(1)Cu6Au6 cuboctahedra; corners with three equivalent Cu(1)Cu9Au3 cuboctahedra; corners with six equivalent Cu(2)Cu12 cuboctahedra; edges with three equivalent Au(1)Cu6Au6 cuboctahedra; edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra; edges with twelve Cu(2,2)Cu12 cuboctahedra; faces with six equivalent Cu(1)Cu9Au3 cuboctahedra; and faces with twelve Cu(2,2)Cu12 cuboctahedra. In the fourth Cu site, Cu(2) is bonded to three equivalent Cu(1) and nine equivalent Cu(2) atoms to form CuCu12 cuboctahedra that share corners with three equivalent Au(1)Cu6Au6 cuboctahedra, corners with three equivalent Cu(1)Cu9Au3 cuboctahedra, corners with six equivalent Cu(2)Cu12 cuboctahedra, edges with three equivalent Au(1)Cu6Au6 cuboctahedra, edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra, edges with twelve equivalent Cu(2)Cu12 cuboctahedra, faces with six equivalent Cu(1)Cu9Au3 cuboctahedra, and faces with twelve equivalent Cu(2)Cu12 cuboctahedra. In the fifth Cu site, Cu(2) is bonded to three equivalent Cu(1) and nine Cu(2,2) atoms to form CuCu12 cuboctahedra that share corners with three equivalent Au(1)Cu6Au6 cuboctahedra; corners with three equivalent Cu(1)Cu9Au3 cuboctahedra; corners with six equivalent Cu(2)Cu12 cuboctahedra; edges with three equivalent Au(1)Cu6Au6 cuboctahedra; edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra; edges with twelve Cu(2,2)Cu12 cuboctahedra; faces with six equivalent Cu(1)Cu9Au3 cuboctahedra; and faces with twelve Cu(2,2)Cu12 cuboctahedra. In the sixth Cu site, Cu(2) is bonded to three equivalent Cu(1) and nine Cu(2,2) atoms to form CuCu12 cuboctahedra that share corners with three equivalent Au(1)Cu6Au6 cuboctahedra; corners with three equivalent Cu(1)Cu9Au3 cuboctahedra; corners with six equivalent Cu(2)Cu12 cuboctahedra; edges with three equivalent Au(1)Cu6Au6 cuboctahedra; edges with nine equivalent Cu(1)Cu9Au3 cuboctahedra; edges with twelve Cu(2,2)Cu12 cuboctahedra; faces with six equivalent Cu(1)Cu9Au3 cuboctahedra; and faces with twelve Cu(2,2)Cu12 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cu4Au
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.620
_cell_length_b   10.620
_cell_length_c   10.620
_cell_angle_alpha   14.655
_cell_angle_beta   14.655
_cell_angle_gamma   14.655
_symmetry_Int_Tables_number   1
_cell_volume   66.751
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Cu  Cu0  1  0.594  0.594  0.594  1.0
  Cu  Cu1  1  0.198  0.198  0.198  1.0
  Cu  Cu2  1  0.802  0.802  0.802  1.0
  Cu  Cu3  1  0.406  0.406  0.406  1.0
  Au  Au4  1  0.000  0.000  0.000  1.0
[/CIF]
.