The structure described by U6Ni crystallizes in the tetragonal I4/mcm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 2-coordinate geometry to four equivalent U(2) and two equivalent Ni(1) atoms. In the second U site, U(2) is bonded in a 13-coordinate geometry to five equivalent U(2) and eight equivalent U(1) atoms. Ni(1) is bonded in a 10-coordinate geometry to eight equivalent U(1) and two equivalent Ni(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_U6Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.715
_cell_length_b   7.715
_cell_length_c   7.715
_cell_angle_alpha   96.299
_cell_angle_beta   96.299
_cell_angle_gamma   141.313
_symmetry_Int_Tables_number   1
_cell_volume   270.859
_cell_formula_units_Z   2
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  0.105  0.782  0.887  1.0
  U  U1  1  0.594  0.094  0.688  1.0
  U  U2  1  0.906  0.594  0.500  1.0
  U  U3  1  0.895  0.218  0.113  1.0
  U  U4  1  0.406  0.906  0.312  1.0
  U  U5  1  0.782  0.895  0.677  1.0
  U  U6  1  0.218  0.105  0.323  1.0
  U  U7  1  0.395  0.282  0.677  1.0
  U  U8  1  0.282  0.605  0.887  1.0
  U  U9  1  0.605  0.718  0.323  1.0
  U  U10  1  0.094  0.406  0.500  1.0
  U  U11  1  0.718  0.395  0.113  1.0
  Ni  Ni12  1  0.250  0.250  0.000  1.0
  Ni  Ni13  1  0.750  0.750  0.000  1.0
[/CIF]
.
The structure described by U6Ni crystallizes in the tetragonal I4/mcm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 2-coordinate geometry to four equivalent U(2) and two equivalent Ni(1) atoms. In the second U site, U(2) is bonded in a 13-coordinate geometry to five equivalent U(2) and eight equivalent U(1) atoms. Ni(1) is bonded in a 10-coordinate geometry to eight equivalent U(1) and two equivalent Ni(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_U6Ni
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.715
_cell_length_b   7.715
_cell_length_c   7.715
_cell_angle_alpha   96.299
_cell_angle_beta   96.299
_cell_angle_gamma   141.313
_symmetry_Int_Tables_number   1
_cell_volume   270.859
_cell_formula_units_Z   2
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  0.105  0.782  0.887  1.0
  U  U1  1  0.594  0.094  0.688  1.0
  U  U2  1  0.906  0.594  0.500  1.0
  U  U3  1  0.895  0.218  0.113  1.0
  U  U4  1  0.406  0.906  0.312  1.0
  U  U5  1  0.782  0.895  0.677  1.0
  U  U6  1  0.218  0.105  0.323  1.0
  U  U7  1  0.395  0.282  0.677  1.0
  U  U8  1  0.282  0.605  0.887  1.0
  U  U9  1  0.605  0.718  0.323  1.0
  U  U10  1  0.094  0.406  0.500  1.0
  U  U11  1  0.718  0.395  0.113  1.0
  Ni  Ni12  1  0.250  0.250  0.000  1.0
  Ni  Ni13  1  0.750  0.750  0.000  1.0
[/CIF]
.