The crystal structure described by Y2W2O9 crystallizes in the triclinic P-1 space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), one O(9), and two equivalent O(3) atoms. In the second Y site, Y(2) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(9), two equivalent O(7), and two equivalent O(8) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted corner-sharing WO6 octahedra. In the second W site, W(2) is bonded to one O(2), one O(5), one O(7), one O(8), and one O(9) atom to form corner-sharing WO5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 45-55°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Y(1), one Y(2), and one W(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Y(1), one Y(2), one W(1), and one W(2) atom. In the third O site, O(3) is bonded to one Y(2), two equivalent Y(1), and one W(1) atom to form a mixture of corner and edge-sharing OY3W trigonal pyramids. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Y(1), one Y(2), and one W(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Y(1), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Y(1) and one W(1) atom. In the seventh O site, O(7) is bonded to one Y(1), two equivalent Y(2), and one W(2) atom to form a mixture of distorted corner and edge-sharing OY3W tetrahedra. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Y(2) and one W(2) atom. In the ninth O site, O(9) is bonded in a distorted T-shaped geometry to one Y(1), one Y(2), and one W(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.735
_cell_length_b   7.129
_cell_length_c   7.465
_cell_angle_alpha   70.760
_cell_angle_beta   84.350
_cell_angle_gamma   82.615
_symmetry_Int_Tables_number   1
_cell_volume   335.005
_cell_formula_units_Z   2
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
  Y  Y0  1  0.153  0.260  0.154  1.0
  Y  Y1  1  0.615  0.287  0.375  1.0
  Y  Y2  1  0.385  0.713  0.625  1.0
  Y  Y3  1  0.847  0.740  0.846  1.0
  W  W4  1  0.267  0.736  0.054  1.0
  W  W5  1  0.841  0.793  0.368  1.0
  W  W6  1  0.159  0.207  0.632  1.0
  W  W7  1  0.733  0.264  0.946  1.0
  O  O8  1  0.496  0.236  0.093  1.0
  O  O9  1  0.852  0.070  0.217  1.0
  O  O10  1  0.818  0.430  0.091  1.0
  O  O11  1  0.329  0.503  0.247  1.0
  O  O12  1  0.961  0.739  0.140  1.0
  O  O13  1  0.261  0.937  0.157  1.0
  O  O14  1  0.315  0.088  0.457  1.0
  O  O15  1  0.633  0.642  0.381  1.0
  O  O16  1  0.957  0.305  0.467  1.0
  O  O17  1  0.043  0.695  0.533  1.0
  O  O18  1  0.367  0.358  0.619  1.0
  O  O19  1  0.685  0.912  0.543  1.0
  O  O20  1  0.739  0.063  0.843  1.0
  O  O21  1  0.039  0.261  0.860  1.0
  O  O22  1  0.671  0.497  0.753  1.0
  O  O23  1  0.182  0.570  0.909  1.0
  O  O24  1  0.148  0.930  0.783  1.0
  O  O25  1  0.504  0.764  0.907  1.0
[/CIF]
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The crystal structure described by Y2W2O9 crystallizes in the triclinic P-1 space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), one O(9), and two equivalent O(3) atoms. In the second Y site, Y(2) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(9), two equivalent O(7), and two equivalent O(8) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted corner-sharing WO6 octahedra. In the second W site, W(2) is bonded to one O(2), one O(5), one O(7), one O(8), and one O(9) atom to form corner-sharing WO5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 45-55°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Y(1), one Y(2), and one W(1) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Y(1), one Y(2), one W(1), and one W(2) atom. In the third O site, O(3) is bonded to one Y(2), two equivalent Y(1), and one W(1) atom to form a mixture of corner and edge-sharing OY3W trigonal pyramids. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Y(1), one Y(2), and one W(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Y(1), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Y(1) and one W(1) atom. In the seventh O site, O(7) is bonded to one Y(1), two equivalent Y(2), and one W(2) atom to form a mixture of distorted corner and edge-sharing OY3W tetrahedra. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Y(2) and one W(2) atom. In the ninth O site, O(9) is bonded in a distorted T-shaped geometry to one Y(1), one Y(2), and one W(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.735
_cell_length_b   7.129
_cell_length_c   7.465
_cell_angle_alpha   70.760
_cell_angle_beta   84.350
_cell_angle_gamma   82.615
_symmetry_Int_Tables_number   1
_cell_volume   335.005
_cell_formula_units_Z   2
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
  Y  Y0  1  0.153  0.260  0.154  1.0
  Y  Y1  1  0.615  0.287  0.375  1.0
  Y  Y2  1  0.385  0.713  0.625  1.0
  Y  Y3  1  0.847  0.740  0.846  1.0
  W  W4  1  0.267  0.736  0.054  1.0
  W  W5  1  0.841  0.793  0.368  1.0
  W  W6  1  0.159  0.207  0.632  1.0
  W  W7  1  0.733  0.264  0.946  1.0
  O  O8  1  0.496  0.236  0.093  1.0
  O  O9  1  0.852  0.070  0.217  1.0
  O  O10  1  0.818  0.430  0.091  1.0
  O  O11  1  0.329  0.503  0.247  1.0
  O  O12  1  0.961  0.739  0.140  1.0
  O  O13  1  0.261  0.937  0.157  1.0
  O  O14  1  0.315  0.088  0.457  1.0
  O  O15  1  0.633  0.642  0.381  1.0
  O  O16  1  0.957  0.305  0.467  1.0
  O  O17  1  0.043  0.695  0.533  1.0
  O  O18  1  0.367  0.358  0.619  1.0
  O  O19  1  0.685  0.912  0.543  1.0
  O  O20  1  0.739  0.063  0.843  1.0
  O  O21  1  0.039  0.261  0.860  1.0
  O  O22  1  0.671  0.497  0.753  1.0
  O  O23  1  0.182  0.570  0.909  1.0
  O  O24  1  0.148  0.930  0.783  1.0
  O  O25  1  0.504  0.764  0.907  1.0
[/CIF]
.