The structure described by UNiP2 crystallizes in the orthorhombic Pmm2 space group. There are three inequivalent U sites. In the first U site, U(1) is bonded in a 12-coordinate geometry to two equivalent Ni(1), two equivalent Ni(2), two equivalent P(5), two equivalent P(6), and four equivalent P(3) atoms. In the second U site, U(2) is bonded in a 10-coordinate geometry to two equivalent Ni(3), two equivalent P(5), two equivalent P(6), and four equivalent P(4) atoms. In the third U site, U(3) is bonded in a 15-coordinate geometry to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), one P(4), four equivalent P(1), and four equivalent P(2) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent U(1), two equivalent U(3), two equivalent P(1), and two equivalent P(3) atoms to form a mixture of distorted edge, face, and corner-sharing NiU4P4 tetrahedra. In the second Ni site, Ni(2) is bonded to two equivalent U(1), two equivalent U(3), two equivalent P(1), and two equivalent P(3) atoms to form a mixture of distorted edge, face, and corner-sharing NiU4P4 tetrahedra. In the third Ni site, Ni(3) is bonded to two equivalent U(2), two equivalent U(3), two equivalent P(2), and two equivalent P(4) atoms to form a mixture of distorted edge and corner-sharing NiU4P4 tetrahedra. There are six inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to four equivalent U(3), two equivalent Ni(1), two equivalent Ni(2), and one P(2) atom. In the second P site, P(2) is bonded in a 7-coordinate geometry to four equivalent U(3), two equivalent Ni(3), and one P(1) atom. In the third P site, P(3) is bonded in a 8-coordinate geometry to four equivalent U(1), two equivalent Ni(1), and two equivalent Ni(2) atoms. In the fourth P site, P(4) is bonded in a 6-coordinate geometry to one U(3), four equivalent U(2), and two equivalent Ni(3) atoms. In the fifth P site, P(5) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent U(2), and four equivalent P(6) atoms. In the sixth P site, P(6) is bonded in a distorted body-centered cubic geometry to two equivalent U(1), two equivalent U(2), and four equivalent P(5) atoms. is represented by the CIF card [CIF]
data_UNiP2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.793
_cell_length_b   3.799
_cell_length_c   13.570
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   195.500
_cell_formula_units_Z   3
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  0.500  0.000  0.351  1.0
  U  U1  1  0.500  0.000  0.659  1.0
  U  U2  1  0.000  0.500  0.990  1.0
  Ni  Ni3  1  0.000  0.000  0.171  1.0
  Ni  Ni4  1  0.500  0.500  0.170  1.0
  Ni  Ni5  1  0.000  0.000  0.826  1.0
  P  P6  1  0.500  0.000  0.082  1.0
  P  P7  1  0.500  0.000  0.912  1.0
  P  P8  1  0.000  0.500  0.265  1.0
  P  P9  1  0.000  0.500  0.739  1.0
  P  P10  1  0.500  0.500  0.505  1.0
  P  P11  1  0.000  0.000  0.504  1.0
[/CIF]
.
The structure described by UNiP2 crystallizes in the orthorhombic Pmm2 space group. There are three inequivalent U sites. In the first U site, U(1) is bonded in a 12-coordinate geometry to two equivalent Ni(1), two equivalent Ni(2), two equivalent P(5), two equivalent P(6), and four equivalent P(3) atoms. In the second U site, U(2) is bonded in a 10-coordinate geometry to two equivalent Ni(3), two equivalent P(5), two equivalent P(6), and four equivalent P(4) atoms. In the third U site, U(3) is bonded in a 15-coordinate geometry to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), one P(4), four equivalent P(1), and four equivalent P(2) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent U(1), two equivalent U(3), two equivalent P(1), and two equivalent P(3) atoms to form a mixture of distorted edge, face, and corner-sharing NiU4P4 tetrahedra. In the second Ni site, Ni(2) is bonded to two equivalent U(1), two equivalent U(3), two equivalent P(1), and two equivalent P(3) atoms to form a mixture of distorted edge, face, and corner-sharing NiU4P4 tetrahedra. In the third Ni site, Ni(3) is bonded to two equivalent U(2), two equivalent U(3), two equivalent P(2), and two equivalent P(4) atoms to form a mixture of distorted edge and corner-sharing NiU4P4 tetrahedra. There are six inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to four equivalent U(3), two equivalent Ni(1), two equivalent Ni(2), and one P(2) atom. In the second P site, P(2) is bonded in a 7-coordinate geometry to four equivalent U(3), two equivalent Ni(3), and one P(1) atom. In the third P site, P(3) is bonded in a 8-coordinate geometry to four equivalent U(1), two equivalent Ni(1), and two equivalent Ni(2) atoms. In the fourth P site, P(4) is bonded in a 6-coordinate geometry to one U(3), four equivalent U(2), and two equivalent Ni(3) atoms. In the fifth P site, P(5) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent U(2), and four equivalent P(6) atoms. In the sixth P site, P(6) is bonded in a distorted body-centered cubic geometry to two equivalent U(1), two equivalent U(2), and four equivalent P(5) atoms. is represented by the CIF card [CIF]
data_UNiP2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.793
_cell_length_b   3.799
_cell_length_c   13.570
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   195.500
_cell_formula_units_Z   3
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  0.500  0.000  0.351  1.0
  U  U1  1  0.500  0.000  0.659  1.0
  U  U2  1  0.000  0.500  0.990  1.0
  Ni  Ni3  1  0.000  0.000  0.171  1.0
  Ni  Ni4  1  0.500  0.500  0.170  1.0
  Ni  Ni5  1  0.000  0.000  0.826  1.0
  P  P6  1  0.500  0.000  0.082  1.0
  P  P7  1  0.500  0.000  0.912  1.0
  P  P8  1  0.000  0.500  0.265  1.0
  P  P9  1  0.000  0.500  0.739  1.0
  P  P10  1  0.500  0.500  0.505  1.0
  P  P11  1  0.000  0.000  0.504  1.0
[/CIF]
.