The material structure described by W2P2O9 crystallizes in the orthorhombic Pnma space group. There are two inequivalent W sites. In the first W site, 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 W(2)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 53°. In the second W site, W(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form WO6 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 W(2)O6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(6), and two equivalent O(5) atoms to form PO4 tetrahedra that share corners with two equivalent W(2)O6 octahedra and corners with three equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-51°. In the second P site, P(2) is bonded to one O(4), one O(7), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with two equivalent W(2)O6 octahedra and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles are 46°. There are seven inequivalent O sites. In the first O site, O(4) is bonded in an L-shaped 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 linear geometry to one W(1) and one P(1) atom. In the fourth O site, O(7) is bonded in an L-shaped geometry to one W(1) and one P(2) atom. In the fifth O site, O(1) is bonded in a distorted bent 120 degrees geometry to one W(2) and one P(2) atom. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent W(2) and one P(1) atom. In the seventh O site, O(3) is bonded in a trigonal planar geometry to one W(1) and two equivalent W(2) atoms. is represented by the CIF file [CIF]
data_P2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.589
_cell_length_b   7.931
_cell_length_c   14.630
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   764.518
_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
  P  P0  1  0.750  0.858  0.438  1.0
  P  P1  1  0.250  0.142  0.562  1.0
  P  P2  1  0.250  0.358  0.062  1.0
  P  P3  1  0.750  0.642  0.938  1.0
  P  P4  1  0.250  0.901  0.189  1.0
  P  P5  1  0.250  0.599  0.689  1.0
  P  P6  1  0.750  0.401  0.311  1.0
  P  P7  1  0.750  0.099  0.811  1.0
  W  W8  1  0.250  0.858  0.372  1.0
  W  W9  1  0.750  0.142  0.628  1.0
  W  W10  1  0.750  0.358  0.128  1.0
  W  W11  1  0.250  0.642  0.872  1.0
  W  W12  1  0.000  0.500  0.500  1.0
  W  W13  1  0.000  0.000  0.000  1.0
  W  W14  1  0.500  0.000  0.000  1.0
  W  W15  1  0.500  0.500  0.500  1.0
  O  O16  1  0.559  0.097  0.874  1.0
  O  O17  1  0.059  0.903  0.126  1.0
  O  O18  1  0.441  0.597  0.626  1.0
  O  O19  1  0.941  0.403  0.374  1.0
  O  O20  1  0.441  0.903  0.126  1.0
  O  O21  1  0.941  0.097  0.874  1.0
  O  O22  1  0.559  0.403  0.374  1.0
  O  O23  1  0.059  0.597  0.626  1.0
  O  O24  1  0.750  0.827  0.983  1.0
  O  O25  1  0.250  0.173  0.017  1.0
  O  O26  1  0.250  0.327  0.517  1.0
  O  O27  1  0.750  0.673  0.483  1.0
  O  O28  1  0.250  0.632  0.453  1.0
  O  O29  1  0.750  0.368  0.547  1.0
  O  O30  1  0.750  0.132  0.047  1.0
  O  O31  1  0.250  0.868  0.953  1.0
  O  O32  1  0.250  0.736  0.250  1.0
  O  O33  1  0.750  0.264  0.750  1.0
  O  O34  1  0.750  0.236  0.250  1.0
  O  O35  1  0.250  0.764  0.750  1.0
  O  O36  1  0.941  0.633  0.879  1.0
  O  O37  1  0.441  0.367  0.121  1.0
  O  O38  1  0.059  0.133  0.621  1.0
  O  O39  1  0.559  0.867  0.379  1.0
  O  O40  1  0.059  0.367  0.121  1.0
  O  O41  1  0.559  0.633  0.879  1.0
  O  O42  1  0.941  0.867  0.379  1.0
  O  O43  1  0.441  0.133  0.621  1.0
  O  O44  1  0.250  0.009  0.488  1.0
  O  O45  1  0.750  0.540  0.237  1.0
  O  O46  1  0.750  0.960  0.737  1.0
  O  O47  1  0.250  0.040  0.263  1.0
  O  O48  1  0.250  0.491  0.988  1.0
  O  O49  1  0.750  0.509  0.012  1.0
  O  O50  1  0.750  0.991  0.512  1.0
  O  O51  1  0.250  0.460  0.763  1.0
[/CIF]
.
The material structure described by W2P2O9 crystallizes in the orthorhombic Pnma space group. There are two inequivalent W sites. In the first W site, 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 W(2)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 53°. In the second W site, W(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form WO6 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 W(2)O6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(6), and two equivalent O(5) atoms to form PO4 tetrahedra that share corners with two equivalent W(2)O6 octahedra and corners with three equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-51°. In the second P site, P(2) is bonded to one O(4), one O(7), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with two equivalent W(2)O6 octahedra and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles are 46°. There are seven inequivalent O sites. In the first O site, O(4) is bonded in an L-shaped 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 linear geometry to one W(1) and one P(1) atom. In the fourth O site, O(7) is bonded in an L-shaped geometry to one W(1) and one P(2) atom. In the fifth O site, O(1) is bonded in a distorted bent 120 degrees geometry to one W(2) and one P(2) atom. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent W(2) and one P(1) atom. In the seventh O site, O(3) is bonded in a trigonal planar geometry to one W(1) and two equivalent W(2) atoms. is represented by the CIF file [CIF]
data_P2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.589
_cell_length_b   7.931
_cell_length_c   14.630
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   764.518
_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
  P  P0  1  0.750  0.858  0.438  1.0
  P  P1  1  0.250  0.142  0.562  1.0
  P  P2  1  0.250  0.358  0.062  1.0
  P  P3  1  0.750  0.642  0.938  1.0
  P  P4  1  0.250  0.901  0.189  1.0
  P  P5  1  0.250  0.599  0.689  1.0
  P  P6  1  0.750  0.401  0.311  1.0
  P  P7  1  0.750  0.099  0.811  1.0
  W  W8  1  0.250  0.858  0.372  1.0
  W  W9  1  0.750  0.142  0.628  1.0
  W  W10  1  0.750  0.358  0.128  1.0
  W  W11  1  0.250  0.642  0.872  1.0
  W  W12  1  0.000  0.500  0.500  1.0
  W  W13  1  0.000  0.000  0.000  1.0
  W  W14  1  0.500  0.000  0.000  1.0
  W  W15  1  0.500  0.500  0.500  1.0
  O  O16  1  0.559  0.097  0.874  1.0
  O  O17  1  0.059  0.903  0.126  1.0
  O  O18  1  0.441  0.597  0.626  1.0
  O  O19  1  0.941  0.403  0.374  1.0
  O  O20  1  0.441  0.903  0.126  1.0
  O  O21  1  0.941  0.097  0.874  1.0
  O  O22  1  0.559  0.403  0.374  1.0
  O  O23  1  0.059  0.597  0.626  1.0
  O  O24  1  0.750  0.827  0.983  1.0
  O  O25  1  0.250  0.173  0.017  1.0
  O  O26  1  0.250  0.327  0.517  1.0
  O  O27  1  0.750  0.673  0.483  1.0
  O  O28  1  0.250  0.632  0.453  1.0
  O  O29  1  0.750  0.368  0.547  1.0
  O  O30  1  0.750  0.132  0.047  1.0
  O  O31  1  0.250  0.868  0.953  1.0
  O  O32  1  0.250  0.736  0.250  1.0
  O  O33  1  0.750  0.264  0.750  1.0
  O  O34  1  0.750  0.236  0.250  1.0
  O  O35  1  0.250  0.764  0.750  1.0
  O  O36  1  0.941  0.633  0.879  1.0
  O  O37  1  0.441  0.367  0.121  1.0
  O  O38  1  0.059  0.133  0.621  1.0
  O  O39  1  0.559  0.867  0.379  1.0
  O  O40  1  0.059  0.367  0.121  1.0
  O  O41  1  0.559  0.633  0.879  1.0
  O  O42  1  0.941  0.867  0.379  1.0
  O  O43  1  0.441  0.133  0.621  1.0
  O  O44  1  0.250  0.009  0.488  1.0
  O  O45  1  0.750  0.540  0.237  1.0
  O  O46  1  0.750  0.960  0.737  1.0
  O  O47  1  0.250  0.040  0.263  1.0
  O  O48  1  0.250  0.491  0.988  1.0
  O  O49  1  0.750  0.509  0.012  1.0
  O  O50  1  0.750  0.991  0.512  1.0
  O  O51  1  0.250  0.460  0.763  1.0
[/CIF]
.