The structure described by Bi2W2O9 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(3), one O(9), two equivalent O(4), and two equivalent O(7) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 17-28°. In the second W site, W(2) is bonded to one O(3), one O(6), two equivalent O(5), and two equivalent O(8) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 17-26°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(9) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent W(2) atoms. In the second O site, O(6) is bonded in a 3-coordinate geometry to one W(2) and two equivalent Bi(2) atoms. In the third O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms. In the fourth O site, O(8) is bonded in a bent 150 degrees geometry to two equivalent W(2) atoms. In the fifth O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the sixth O site, O(9) is bonded in a 3-coordinate geometry to one W(1) and two equivalent Bi(1) atoms. In the seventh O site, O(2) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the eighth O site, O(3) is bonded in a linear geometry to one W(1) and one W(2) atom. In the ninth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Bi2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.453
_cell_length_b   5.453
_cell_length_c   24.559
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   730.233
_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
  Bi  Bi0  1  0.644  0.022  0.290  1.0
  Bi  Bi1  1  0.356  0.978  0.790  1.0
  Bi  Bi2  1  0.856  0.522  0.790  1.0
  Bi  Bi3  1  0.144  0.478  0.290  1.0
  Bi  Bi4  1  0.642  0.522  0.396  1.0
  Bi  Bi5  1  0.358  0.478  0.896  1.0
  Bi  Bi6  1  0.858  0.022  0.896  1.0
  Bi  Bi7  1  0.142  0.978  0.396  1.0
  W  W8  1  0.680  0.501  0.171  1.0
  W  W9  1  0.320  0.499  0.671  1.0
  W  W10  1  0.820  0.001  0.671  1.0
  W  W11  1  0.180  0.999  0.171  1.0
  W  W12  1  0.307  0.998  0.017  1.0
  W  W13  1  0.693  0.002  0.517  1.0
  W  W14  1  0.193  0.498  0.517  1.0
  W  W15  1  0.807  0.502  0.017  1.0
  O  O16  1  0.414  0.759  0.342  1.0
  O  O17  1  0.586  0.241  0.842  1.0
  O  O18  1  0.086  0.259  0.842  1.0
  O  O19  1  0.914  0.741  0.342  1.0
  O  O20  1  0.414  0.259  0.344  1.0
  O  O21  1  0.586  0.741  0.844  1.0
  O  O22  1  0.086  0.759  0.844  1.0
  O  O23  1  0.914  0.241  0.344  1.0
  O  O24  1  0.243  0.945  0.094  1.0
  O  O25  1  0.757  0.055  0.594  1.0
  O  O26  1  0.257  0.445  0.594  1.0
  O  O27  1  0.743  0.555  0.094  1.0
  O  O28  1  0.414  0.296  0.161  1.0
  O  O29  1  0.586  0.704  0.661  1.0
  O  O30  1  0.086  0.796  0.661  1.0
  O  O31  1  0.914  0.204  0.161  1.0
  O  O32  1  0.570  0.208  0.027  1.0
  O  O33  1  0.430  0.792  0.527  1.0
  O  O34  1  0.930  0.708  0.527  1.0
  O  O35  1  0.070  0.292  0.027  1.0
  O  O36  1  0.273  0.068  0.941  1.0
  O  O37  1  0.727  0.932  0.441  1.0
  O  O38  1  0.227  0.568  0.441  1.0
  O  O39  1  0.773  0.432  0.941  1.0
  O  O40  1  0.492  0.787  0.182  1.0
  O  O41  1  0.508  0.213  0.682  1.0
  O  O42  1  0.008  0.287  0.682  1.0
  O  O43  1  0.992  0.713  0.182  1.0
  O  O44  1  0.499  0.716  0.006  1.0
  O  O45  1  0.501  0.284  0.506  1.0
  O  O46  1  0.001  0.216  0.506  1.0
  O  O47  1  0.999  0.784  0.006  1.0
  O  O48  1  0.717  0.432  0.246  1.0
  O  O49  1  0.283  0.568  0.746  1.0
  O  O50  1  0.783  0.932  0.746  1.0
  O  O51  1  0.217  0.068  0.246  1.0
[/CIF]
.
The structure described by Bi2W2O9 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(3), one O(9), two equivalent O(4), and two equivalent O(7) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 17-28°. In the second W site, W(2) is bonded to one O(3), one O(6), two equivalent O(5), and two equivalent O(8) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 17-26°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(9) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent W(2) atoms. In the second O site, O(6) is bonded in a 3-coordinate geometry to one W(2) and two equivalent Bi(2) atoms. In the third O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms. In the fourth O site, O(8) is bonded in a bent 150 degrees geometry to two equivalent W(2) atoms. In the fifth O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the sixth O site, O(9) is bonded in a 3-coordinate geometry to one W(1) and two equivalent Bi(1) atoms. In the seventh O site, O(2) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the eighth O site, O(3) is bonded in a linear geometry to one W(1) and one W(2) atom. In the ninth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Bi2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.453
_cell_length_b   5.453
_cell_length_c   24.559
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   730.233
_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
  Bi  Bi0  1  0.644  0.022  0.290  1.0
  Bi  Bi1  1  0.356  0.978  0.790  1.0
  Bi  Bi2  1  0.856  0.522  0.790  1.0
  Bi  Bi3  1  0.144  0.478  0.290  1.0
  Bi  Bi4  1  0.642  0.522  0.396  1.0
  Bi  Bi5  1  0.358  0.478  0.896  1.0
  Bi  Bi6  1  0.858  0.022  0.896  1.0
  Bi  Bi7  1  0.142  0.978  0.396  1.0
  W  W8  1  0.680  0.501  0.171  1.0
  W  W9  1  0.320  0.499  0.671  1.0
  W  W10  1  0.820  0.001  0.671  1.0
  W  W11  1  0.180  0.999  0.171  1.0
  W  W12  1  0.307  0.998  0.017  1.0
  W  W13  1  0.693  0.002  0.517  1.0
  W  W14  1  0.193  0.498  0.517  1.0
  W  W15  1  0.807  0.502  0.017  1.0
  O  O16  1  0.414  0.759  0.342  1.0
  O  O17  1  0.586  0.241  0.842  1.0
  O  O18  1  0.086  0.259  0.842  1.0
  O  O19  1  0.914  0.741  0.342  1.0
  O  O20  1  0.414  0.259  0.344  1.0
  O  O21  1  0.586  0.741  0.844  1.0
  O  O22  1  0.086  0.759  0.844  1.0
  O  O23  1  0.914  0.241  0.344  1.0
  O  O24  1  0.243  0.945  0.094  1.0
  O  O25  1  0.757  0.055  0.594  1.0
  O  O26  1  0.257  0.445  0.594  1.0
  O  O27  1  0.743  0.555  0.094  1.0
  O  O28  1  0.414  0.296  0.161  1.0
  O  O29  1  0.586  0.704  0.661  1.0
  O  O30  1  0.086  0.796  0.661  1.0
  O  O31  1  0.914  0.204  0.161  1.0
  O  O32  1  0.570  0.208  0.027  1.0
  O  O33  1  0.430  0.792  0.527  1.0
  O  O34  1  0.930  0.708  0.527  1.0
  O  O35  1  0.070  0.292  0.027  1.0
  O  O36  1  0.273  0.068  0.941  1.0
  O  O37  1  0.727  0.932  0.441  1.0
  O  O38  1  0.227  0.568  0.441  1.0
  O  O39  1  0.773  0.432  0.941  1.0
  O  O40  1  0.492  0.787  0.182  1.0
  O  O41  1  0.508  0.213  0.682  1.0
  O  O42  1  0.008  0.287  0.682  1.0
  O  O43  1  0.992  0.713  0.182  1.0
  O  O44  1  0.499  0.716  0.006  1.0
  O  O45  1  0.501  0.284  0.506  1.0
  O  O46  1  0.001  0.216  0.506  1.0
  O  O47  1  0.999  0.784  0.006  1.0
  O  O48  1  0.717  0.432  0.246  1.0
  O  O49  1  0.283  0.568  0.746  1.0
  O  O50  1  0.783  0.932  0.746  1.0
  O  O51  1  0.217  0.068  0.246  1.0
[/CIF]
.