The material structure described by U3Cu is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to four equivalent U(2) and four equivalent Cu(1) atoms to form a mixture of distorted corner, edge, and face-sharing UU4Cu4 tetrahedra. In the second U site, U(2) is bonded in a 14-coordinate geometry to eight equivalent U(1) and six equivalent Cu(1) atoms. Cu(1) is bonded in a distorted body-centered cubic geometry to six equivalent U(2) and eight equivalent U(1) atoms. is represented by the CIF card [CIF]
data_U3Cu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.707
_cell_length_b   4.707
_cell_length_c   4.707
_cell_angle_alpha   120.728
_cell_angle_beta   120.728
_cell_angle_gamma   88.743
_symmetry_Int_Tables_number   1
_cell_volume   72.904
_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  0.750  0.250  0.500  1.0
  U  U1  1  0.250  0.750  0.500  1.0
  U  U2  1  0.500  0.500  0.000  1.0
  Cu  Cu3  1  0.000  0.000  0.000  1.0
[/CIF]
.
The material structure described by U3Cu is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded to four equivalent U(2) and four equivalent Cu(1) atoms to form a mixture of distorted corner, edge, and face-sharing UU4Cu4 tetrahedra. In the second U site, U(2) is bonded in a 14-coordinate geometry to eight equivalent U(1) and six equivalent Cu(1) atoms. Cu(1) is bonded in a distorted body-centered cubic geometry to six equivalent U(2) and eight equivalent U(1) atoms. is represented by the CIF card [CIF]
data_U3Cu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.707
_cell_length_b   4.707
_cell_length_c   4.707
_cell_angle_alpha   120.728
_cell_angle_beta   120.728
_cell_angle_gamma   88.743
_symmetry_Int_Tables_number   1
_cell_volume   72.904
_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  0.750  0.250  0.500  1.0
  U  U1  1  0.250  0.750  0.500  1.0
  U  U2  1  0.500  0.500  0.000  1.0
  Cu  Cu3  1  0.000  0.000  0.000  1.0
[/CIF]
.