The compound described by WNiP2O9 crystallizes in the orthorhombic Pnma space group. W(1) is bonded to one O(3), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form WO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NiO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and edges with two equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 47°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(7), and two equivalent O(5) atoms to form PO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra and corners with three equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-51°. In the second P site, P(2) is bonded to one O(4), one O(6), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles are 52°. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a water-like geometry to one W(1) and one P(2) atom. In the second O site, O(5) is bonded in a bent 150 degrees geometry to one W(1) and one P(1) atom. In the third O site, O(6) is bonded in a water-like geometry to one W(1) and one P(2) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one Ni(1) and one P(2) atom. In the fifth O site, O(7) is bonded in a linear geometry to one W(1) and one P(1) atom. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Ni(1) and one P(1) atom. In the seventh O site, O(3) is bonded in a distorted T-shaped geometry to one W(1) and two equivalent Ni(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_NiP2WO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.434
_cell_length_b   8.033
_cell_length_c   14.047
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   726.030
_cell_formula_units_Z   4
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
  Ni  Ni0  1  0.500  0.500  0.000  1.0
  Ni  Ni1  1  0.500  0.000  0.500  1.0
  Ni  Ni2  1  0.000  0.000  0.500  1.0
  Ni  Ni3  1  0.000  0.500  0.000  1.0
  P  P4  1  0.250  0.842  0.943  1.0
  P  P5  1  0.750  0.158  0.057  1.0
  P  P6  1  0.750  0.342  0.557  1.0
  P  P7  1  0.250  0.658  0.443  1.0
  P  P8  1  0.750  0.894  0.682  1.0
  P  P9  1  0.250  0.106  0.318  1.0
  P  P10  1  0.250  0.394  0.818  1.0
  P  P11  1  0.750  0.606  0.182  1.0
  W  W12  1  0.750  0.853  0.875  1.0
  W  W13  1  0.250  0.147  0.125  1.0
  W  W14  1  0.250  0.353  0.625  1.0
  W  W15  1  0.750  0.647  0.375  1.0
  O  O16  1  0.049  0.101  0.373  1.0
  O  O17  1  0.549  0.899  0.627  1.0
  O  O18  1  0.951  0.601  0.127  1.0
  O  O19  1  0.451  0.399  0.873  1.0
  O  O20  1  0.951  0.899  0.627  1.0
  O  O21  1  0.451  0.101  0.373  1.0
  O  O22  1  0.049  0.399  0.873  1.0
  O  O23  1  0.549  0.601  0.127  1.0
  O  O24  1  0.250  0.835  0.482  1.0
  O  O25  1  0.750  0.165  0.518  1.0
  O  O26  1  0.750  0.335  0.018  1.0
  O  O27  1  0.250  0.665  0.982  1.0
  O  O28  1  0.750  0.661  0.943  1.0
  O  O29  1  0.250  0.339  0.057  1.0
  O  O30  1  0.250  0.161  0.557  1.0
  O  O31  1  0.750  0.839  0.443  1.0
  O  O32  1  0.750  0.733  0.754  1.0
  O  O33  1  0.250  0.267  0.246  1.0
  O  O34  1  0.250  0.233  0.746  1.0
  O  O35  1  0.750  0.767  0.254  1.0
  O  O36  1  0.443  0.627  0.380  1.0
  O  O37  1  0.943  0.373  0.620  1.0
  O  O38  1  0.557  0.127  0.120  1.0
  O  O39  1  0.057  0.873  0.880  1.0
  O  O40  1  0.557  0.373  0.620  1.0
  O  O41  1  0.057  0.627  0.380  1.0
  O  O42  1  0.443  0.873  0.880  1.0
  O  O43  1  0.943  0.127  0.120  1.0
  O  O44  1  0.750  0.476  0.270  1.0
  O  O45  1  0.250  0.524  0.730  1.0
  O  O46  1  0.250  0.976  0.230  1.0
  O  O47  1  0.750  0.024  0.770  1.0
  O  O48  1  0.750  0.477  0.478  1.0
  O  O49  1  0.250  0.523  0.522  1.0
  O  O50  1  0.250  0.977  0.022  1.0
  O  O51  1  0.750  0.023  0.978  1.0
[/CIF]
.
The compound described by WNiP2O9 crystallizes in the orthorhombic Pnma space group. W(1) is bonded to one O(3), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form WO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NiO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and edges with two equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 47°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(7), and two equivalent O(5) atoms to form PO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra and corners with three equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 1-51°. In the second P site, P(2) is bonded to one O(4), one O(6), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles are 52°. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a water-like geometry to one W(1) and one P(2) atom. In the second O site, O(5) is bonded in a bent 150 degrees geometry to one W(1) and one P(1) atom. In the third O site, O(6) is bonded in a water-like geometry to one W(1) and one P(2) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one Ni(1) and one P(2) atom. In the fifth O site, O(7) is bonded in a linear geometry to one W(1) and one P(1) atom. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Ni(1) and one P(1) atom. In the seventh O site, O(3) is bonded in a distorted T-shaped geometry to one W(1) and two equivalent Ni(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_NiP2WO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.434
_cell_length_b   8.033
_cell_length_c   14.047
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   726.030
_cell_formula_units_Z   4
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
  Ni  Ni0  1  0.500  0.500  0.000  1.0
  Ni  Ni1  1  0.500  0.000  0.500  1.0
  Ni  Ni2  1  0.000  0.000  0.500  1.0
  Ni  Ni3  1  0.000  0.500  0.000  1.0
  P  P4  1  0.250  0.842  0.943  1.0
  P  P5  1  0.750  0.158  0.057  1.0
  P  P6  1  0.750  0.342  0.557  1.0
  P  P7  1  0.250  0.658  0.443  1.0
  P  P8  1  0.750  0.894  0.682  1.0
  P  P9  1  0.250  0.106  0.318  1.0
  P  P10  1  0.250  0.394  0.818  1.0
  P  P11  1  0.750  0.606  0.182  1.0
  W  W12  1  0.750  0.853  0.875  1.0
  W  W13  1  0.250  0.147  0.125  1.0
  W  W14  1  0.250  0.353  0.625  1.0
  W  W15  1  0.750  0.647  0.375  1.0
  O  O16  1  0.049  0.101  0.373  1.0
  O  O17  1  0.549  0.899  0.627  1.0
  O  O18  1  0.951  0.601  0.127  1.0
  O  O19  1  0.451  0.399  0.873  1.0
  O  O20  1  0.951  0.899  0.627  1.0
  O  O21  1  0.451  0.101  0.373  1.0
  O  O22  1  0.049  0.399  0.873  1.0
  O  O23  1  0.549  0.601  0.127  1.0
  O  O24  1  0.250  0.835  0.482  1.0
  O  O25  1  0.750  0.165  0.518  1.0
  O  O26  1  0.750  0.335  0.018  1.0
  O  O27  1  0.250  0.665  0.982  1.0
  O  O28  1  0.750  0.661  0.943  1.0
  O  O29  1  0.250  0.339  0.057  1.0
  O  O30  1  0.250  0.161  0.557  1.0
  O  O31  1  0.750  0.839  0.443  1.0
  O  O32  1  0.750  0.733  0.754  1.0
  O  O33  1  0.250  0.267  0.246  1.0
  O  O34  1  0.250  0.233  0.746  1.0
  O  O35  1  0.750  0.767  0.254  1.0
  O  O36  1  0.443  0.627  0.380  1.0
  O  O37  1  0.943  0.373  0.620  1.0
  O  O38  1  0.557  0.127  0.120  1.0
  O  O39  1  0.057  0.873  0.880  1.0
  O  O40  1  0.557  0.373  0.620  1.0
  O  O41  1  0.057  0.627  0.380  1.0
  O  O42  1  0.443  0.873  0.880  1.0
  O  O43  1  0.943  0.127  0.120  1.0
  O  O44  1  0.750  0.476  0.270  1.0
  O  O45  1  0.250  0.524  0.730  1.0
  O  O46  1  0.250  0.976  0.230  1.0
  O  O47  1  0.750  0.024  0.770  1.0
  O  O48  1  0.750  0.477  0.478  1.0
  O  O49  1  0.250  0.523  0.522  1.0
  O  O50  1  0.250  0.977  0.022  1.0
  O  O51  1  0.750  0.023  0.978  1.0
[/CIF]
.