The crystal structure described by Au4Al crystallizes in the cubic P2_13 space group. There are two inequivalent Au sites. In the first Au site, Au(2) is bonded in a 12-coordinate geometry to three equivalent Au(1), six equivalent Au(2), and three equivalent Al(1) atoms. In the second Au site, Au(1) is bonded in a distorted trigonal planar geometry to nine equivalent Au(2) and three equivalent Al(1) atoms. Al(1) is bonded to three equivalent Au(1) and nine equivalent Au(2) atoms to form a mixture of distorted face and corner-sharing AlAu12 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_AlAu4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.978
_cell_length_b   6.978
_cell_length_c   6.978
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   339.815
_cell_formula_units_Z   4
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
  Al  Al0  1  0.064  0.064  0.064  1.0
  Al  Al1  1  0.436  0.936  0.564  1.0
  Al  Al2  1  0.564  0.436  0.936  1.0
  Al  Al3  1  0.936  0.564  0.436  1.0
  Au  Au4  1  0.682  0.682  0.682  1.0
  Au  Au5  1  0.818  0.318  0.182  1.0
  Au  Au6  1  0.182  0.818  0.318  1.0
  Au  Au7  1  0.318  0.182  0.818  1.0
  Au  Au8  1  0.785  0.949  0.387  1.0
  Au  Au9  1  0.387  0.785  0.949  1.0
  Au  Au10  1  0.949  0.387  0.785  1.0
  Au  Au11  1  0.551  0.613  0.285  1.0
  Au  Au12  1  0.887  0.715  0.051  1.0
  Au  Au13  1  0.051  0.887  0.715  1.0
  Au  Au14  1  0.113  0.215  0.449  1.0
  Au  Au15  1  0.613  0.285  0.551  1.0
  Au  Au16  1  0.449  0.113  0.215  1.0
  Au  Au17  1  0.285  0.551  0.613  1.0
  Au  Au18  1  0.215  0.449  0.113  1.0
  Au  Au19  1  0.715  0.051  0.887  1.0
[/CIF]
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The crystal structure described by Au4Al crystallizes in the cubic P2_13 space group. There are two inequivalent Au sites. In the first Au site, Au(2) is bonded in a 12-coordinate geometry to three equivalent Au(1), six equivalent Au(2), and three equivalent Al(1) atoms. In the second Au site, Au(1) is bonded in a distorted trigonal planar geometry to nine equivalent Au(2) and three equivalent Al(1) atoms. Al(1) is bonded to three equivalent Au(1) and nine equivalent Au(2) atoms to form a mixture of distorted face and corner-sharing AlAu12 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_AlAu4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.978
_cell_length_b   6.978
_cell_length_c   6.978
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   339.815
_cell_formula_units_Z   4
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
  Al  Al0  1  0.064  0.064  0.064  1.0
  Al  Al1  1  0.436  0.936  0.564  1.0
  Al  Al2  1  0.564  0.436  0.936  1.0
  Al  Al3  1  0.936  0.564  0.436  1.0
  Au  Au4  1  0.682  0.682  0.682  1.0
  Au  Au5  1  0.818  0.318  0.182  1.0
  Au  Au6  1  0.182  0.818  0.318  1.0
  Au  Au7  1  0.318  0.182  0.818  1.0
  Au  Au8  1  0.785  0.949  0.387  1.0
  Au  Au9  1  0.387  0.785  0.949  1.0
  Au  Au10  1  0.949  0.387  0.785  1.0
  Au  Au11  1  0.551  0.613  0.285  1.0
  Au  Au12  1  0.887  0.715  0.051  1.0
  Au  Au13  1  0.051  0.887  0.715  1.0
  Au  Au14  1  0.113  0.215  0.449  1.0
  Au  Au15  1  0.613  0.285  0.551  1.0
  Au  Au16  1  0.449  0.113  0.215  1.0
  Au  Au17  1  0.285  0.551  0.613  1.0
  Au  Au18  1  0.215  0.449  0.113  1.0
  Au  Au19  1  0.715  0.051  0.887  1.0
[/CIF]
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