The material structure described by UCu4Al8 crystallizes in the tetragonal I4/mmm space group. U(1) is bonded in a distorted square co-planar geometry to four equivalent Cu(1), eight equivalent Al(1), and eight equivalent Al(2) atoms. Cu(1) is bonded in a 10-coordinate geometry to one U(1), one Cu(1), four equivalent Al(1), and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent U(1), four equivalent Cu(1), two equivalent Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent U(1), four equivalent Cu(1), two equivalent Al(2), and four equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_U(Al2Cu)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.713
_cell_length_b   6.713
_cell_length_c   6.713
_cell_angle_alpha   99.305
_cell_angle_beta   99.305
_cell_angle_gamma   132.579
_symmetry_Int_Tables_number   1
_cell_volume   203.984
_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
  U  U0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.000  0.000  0.500  1.0
  Al  Al2  1  0.500  0.500  0.500  1.0
  Al  Al3  1  0.500  0.000  0.000  1.0
  Al  Al4  1  0.000  0.500  0.000  1.0
  Al  Al5  1  0.500  0.276  0.776  1.0
  Al  Al6  1  0.500  0.724  0.224  1.0
  Al  Al7  1  0.724  0.500  0.224  1.0
  Al  Al8  1  0.276  0.500  0.776  1.0
  Cu  Cu9  1  0.000  0.349  0.349  1.0
  Cu  Cu10  1  0.000  0.651  0.651  1.0
  Cu  Cu11  1  0.651  0.000  0.651  1.0
  Cu  Cu12  1  0.349  0.000  0.349  1.0
[/CIF]
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The material structure described by UCu4Al8 crystallizes in the tetragonal I4/mmm space group. U(1) is bonded in a distorted square co-planar geometry to four equivalent Cu(1), eight equivalent Al(1), and eight equivalent Al(2) atoms. Cu(1) is bonded in a 10-coordinate geometry to one U(1), one Cu(1), four equivalent Al(1), and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent U(1), four equivalent Cu(1), two equivalent Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent U(1), four equivalent Cu(1), two equivalent Al(2), and four equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_U(Al2Cu)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.713
_cell_length_b   6.713
_cell_length_c   6.713
_cell_angle_alpha   99.305
_cell_angle_beta   99.305
_cell_angle_gamma   132.579
_symmetry_Int_Tables_number   1
_cell_volume   203.984
_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
  U  U0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.000  0.000  0.500  1.0
  Al  Al2  1  0.500  0.500  0.500  1.0
  Al  Al3  1  0.500  0.000  0.000  1.0
  Al  Al4  1  0.000  0.500  0.000  1.0
  Al  Al5  1  0.500  0.276  0.776  1.0
  Al  Al6  1  0.500  0.724  0.224  1.0
  Al  Al7  1  0.724  0.500  0.224  1.0
  Al  Al8  1  0.276  0.500  0.776  1.0
  Cu  Cu9  1  0.000  0.349  0.349  1.0
  Cu  Cu10  1  0.000  0.651  0.651  1.0
  Cu  Cu11  1  0.651  0.000  0.651  1.0
  Cu  Cu12  1  0.349  0.000  0.349  1.0
[/CIF]
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