The structure described by U2Ni21B6 crystallizes in the cubic Fm-3m space group. U(1) is bonded in a distorted tetrahedral geometry to four equivalent Ni(2) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted bent 150 degrees geometry to one Ni(3) and two equivalent B(1) atoms. In the second Ni site, Ni(2) is bonded to one U(1) and three equivalent B(1) atoms to form a mixture of distorted corner and edge-sharing NiUB3 tetrahedra. In the third Ni site, Ni(3) is bonded in a cuboctahedral geometry to twelve equivalent Ni(1) atoms. B(1) is bonded in a 8-coordinate geometry to four equivalent Ni(1) and four equivalent Ni(2) atoms. is represented by the CIF card [CIF]
data_U2(Ni7B2)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.455
_cell_length_b   7.455
_cell_length_c   7.455
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   292.920
_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  0.750  0.750  1.0
  U  U1  1  0.250  0.250  0.250  1.0
  Ni  Ni2  1  0.341  1.000  0.659  1.0
  Ni  Ni3  1  0.844  0.385  0.385  1.0
  Ni  Ni4  1  0.615  0.615  0.615  1.0
  Ni  Ni5  1  1.000  0.341  1.000  1.0
  Ni  Ni6  1  0.341  1.000  1.000  1.0
  Ni  Ni7  1  1.000  0.341  0.659  1.0
  Ni  Ni8  1  0.659  1.000  0.341  1.0
  Ni  Ni9  1  1.000  1.000  0.341  1.0
  Ni  Ni10  1  0.341  0.659  1.000  1.0
  Ni  Ni11  1  0.659  0.341  1.000  1.0
  Ni  Ni12  1  1.000  0.659  0.341  1.0
  Ni  Ni13  1  1.000  1.000  0.659  1.0
  Ni  Ni14  1  0.156  0.615  0.615  1.0
  Ni  Ni15  1  0.659  1.000  1.000  1.0
  Ni  Ni16  1  1.000  0.659  1.000  1.0
  Ni  Ni17  1  0.000  1.000  1.000  1.0
  Ni  Ni18  1  0.385  0.385  0.385  1.0
  Ni  Ni19  1  0.385  0.844  0.385  1.0
  Ni  Ni20  1  0.615  0.615  0.156  1.0
  Ni  Ni21  1  0.615  0.156  0.615  1.0
  Ni  Ni22  1  0.385  0.385  0.844  1.0
  B  B23  1  0.735  0.265  0.735  1.0
  B  B24  1  0.265  0.265  0.735  1.0
  B  B25  1  0.735  0.735  0.265  1.0
  B  B26  1  0.735  0.265  0.265  1.0
  B  B27  1  0.265  0.735  0.735  1.0
  B  B28  1  0.265  0.735  0.265  1.0
[/CIF]
.
The structure described by U2Ni21B6 crystallizes in the cubic Fm-3m space group. U(1) is bonded in a distorted tetrahedral geometry to four equivalent Ni(2) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted bent 150 degrees geometry to one Ni(3) and two equivalent B(1) atoms. In the second Ni site, Ni(2) is bonded to one U(1) and three equivalent B(1) atoms to form a mixture of distorted corner and edge-sharing NiUB3 tetrahedra. In the third Ni site, Ni(3) is bonded in a cuboctahedral geometry to twelve equivalent Ni(1) atoms. B(1) is bonded in a 8-coordinate geometry to four equivalent Ni(1) and four equivalent Ni(2) atoms. is represented by the CIF card [CIF]
data_U2(Ni7B2)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.455
_cell_length_b   7.455
_cell_length_c   7.455
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   292.920
_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  0.750  0.750  1.0
  U  U1  1  0.250  0.250  0.250  1.0
  Ni  Ni2  1  0.341  1.000  0.659  1.0
  Ni  Ni3  1  0.844  0.385  0.385  1.0
  Ni  Ni4  1  0.615  0.615  0.615  1.0
  Ni  Ni5  1  1.000  0.341  1.000  1.0
  Ni  Ni6  1  0.341  1.000  1.000  1.0
  Ni  Ni7  1  1.000  0.341  0.659  1.0
  Ni  Ni8  1  0.659  1.000  0.341  1.0
  Ni  Ni9  1  1.000  1.000  0.341  1.0
  Ni  Ni10  1  0.341  0.659  1.000  1.0
  Ni  Ni11  1  0.659  0.341  1.000  1.0
  Ni  Ni12  1  1.000  0.659  0.341  1.0
  Ni  Ni13  1  1.000  1.000  0.659  1.0
  Ni  Ni14  1  0.156  0.615  0.615  1.0
  Ni  Ni15  1  0.659  1.000  1.000  1.0
  Ni  Ni16  1  1.000  0.659  1.000  1.0
  Ni  Ni17  1  0.000  1.000  1.000  1.0
  Ni  Ni18  1  0.385  0.385  0.385  1.0
  Ni  Ni19  1  0.385  0.844  0.385  1.0
  Ni  Ni20  1  0.615  0.615  0.156  1.0
  Ni  Ni21  1  0.615  0.156  0.615  1.0
  Ni  Ni22  1  0.385  0.385  0.844  1.0
  B  B23  1  0.735  0.265  0.735  1.0
  B  B24  1  0.265  0.265  0.735  1.0
  B  B25  1  0.735  0.735  0.265  1.0
  B  B26  1  0.735  0.265  0.265  1.0
  B  B27  1  0.265  0.735  0.735  1.0
  B  B28  1  0.265  0.735  0.265  1.0
[/CIF]
.