The compound described by Gd2W2O9 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), one O(9), and two equivalent O(1) atoms. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), one O(8), one O(9), and two equivalent O(7) 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 a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 45°. In the second W site, W(2) is bonded to one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 45°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Gd(1) and one W(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one W(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one W(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Gd(1), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Gd(1), one Gd(2), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Gd(2), one W(1), and one W(2) atom. In the seventh O site, O(7) is bonded to one Gd(1), two equivalent Gd(2), and one W(2) atom to form edge-sharing OGd3W tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one W(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one W(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Gd2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.830
_cell_length_b   7.717
_cell_length_c   9.285
_cell_angle_alpha   71.852
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   669.258
_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
  Gd  Gd0  1  0.056  0.773  0.654  1.0
  Gd  Gd1  1  0.450  0.711  0.571  1.0
  Gd  Gd2  1  0.444  0.773  0.154  1.0
  Gd  Gd3  1  0.050  0.711  0.071  1.0
  Gd  Gd4  1  0.950  0.289  0.929  1.0
  Gd  Gd5  1  0.556  0.227  0.846  1.0
  Gd  Gd6  1  0.550  0.289  0.429  1.0
  Gd  Gd7  1  0.944  0.227  0.346  1.0
  W  W8  1  0.749  0.929  0.737  1.0
  W  W9  1  0.751  0.929  0.237  1.0
  W  W10  1  0.272  0.426  0.964  1.0
  W  W11  1  0.772  0.574  0.536  1.0
  W  W12  1  0.228  0.426  0.464  1.0
  W  W13  1  0.728  0.574  0.036  1.0
  W  W14  1  0.249  0.071  0.763  1.0
  W  W15  1  0.251  0.071  0.263  1.0
  O  O16  1  0.384  0.994  0.906  1.0
  O  O17  1  0.089  0.943  0.849  1.0
  O  O18  1  0.282  0.895  0.664  1.0
  O  O19  1  0.116  0.994  0.406  1.0
  O  O20  1  0.411  0.943  0.349  1.0
  O  O21  1  0.619  0.773  0.920  1.0
  O  O22  1  0.865  0.732  0.861  1.0
  O  O23  1  0.218  0.895  0.164  1.0
  O  O24  1  0.682  0.741  0.639  1.0
  O  O25  1  0.881  0.773  0.420  1.0
  O  O26  1  0.103  0.559  0.891  1.0
  O  O27  1  0.635  0.732  0.361  1.0
  O  O28  1  0.406  0.504  0.818  1.0
  O  O29  1  0.818  0.741  0.139  1.0
  O  O30  1  0.204  0.597  0.567  1.0
  O  O31  1  0.704  0.403  0.933  1.0
  O  O32  1  0.906  0.496  0.682  1.0
  O  O33  1  0.397  0.559  0.391  1.0
  O  O34  1  0.603  0.441  0.609  1.0
  O  O35  1  0.094  0.504  0.318  1.0
  O  O36  1  0.296  0.597  0.067  1.0
  O  O37  1  0.796  0.403  0.433  1.0
  O  O38  1  0.182  0.259  0.861  1.0
  O  O39  1  0.594  0.496  0.182  1.0
  O  O40  1  0.365  0.268  0.639  1.0
  O  O41  1  0.897  0.441  0.109  1.0
  O  O42  1  0.119  0.227  0.580  1.0
  O  O43  1  0.318  0.259  0.361  1.0
  O  O44  1  0.782  0.105  0.836  1.0
  O  O45  1  0.135  0.268  0.139  1.0
  O  O46  1  0.381  0.227  0.080  1.0
  O  O47  1  0.589  0.057  0.651  1.0
  O  O48  1  0.884  0.006  0.594  1.0
  O  O49  1  0.718  0.105  0.336  1.0
  O  O50  1  0.911  0.057  0.151  1.0
  O  O51  1  0.616  0.006  0.094  1.0
[/CIF]
.
The compound described by Gd2W2O9 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), one O(9), and two equivalent O(1) atoms. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), one O(8), one O(9), and two equivalent O(7) 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 a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 45°. In the second W site, W(2) is bonded to one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 45°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Gd(1) and one W(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one W(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one W(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Gd(1), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Gd(1), one Gd(2), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Gd(2), one W(1), and one W(2) atom. In the seventh O site, O(7) is bonded to one Gd(1), two equivalent Gd(2), and one W(2) atom to form edge-sharing OGd3W tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one W(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Gd(1), one Gd(2), and one W(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Gd2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.830
_cell_length_b   7.717
_cell_length_c   9.285
_cell_angle_alpha   71.852
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   669.258
_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
  Gd  Gd0  1  0.056  0.773  0.654  1.0
  Gd  Gd1  1  0.450  0.711  0.571  1.0
  Gd  Gd2  1  0.444  0.773  0.154  1.0
  Gd  Gd3  1  0.050  0.711  0.071  1.0
  Gd  Gd4  1  0.950  0.289  0.929  1.0
  Gd  Gd5  1  0.556  0.227  0.846  1.0
  Gd  Gd6  1  0.550  0.289  0.429  1.0
  Gd  Gd7  1  0.944  0.227  0.346  1.0
  W  W8  1  0.749  0.929  0.737  1.0
  W  W9  1  0.751  0.929  0.237  1.0
  W  W10  1  0.272  0.426  0.964  1.0
  W  W11  1  0.772  0.574  0.536  1.0
  W  W12  1  0.228  0.426  0.464  1.0
  W  W13  1  0.728  0.574  0.036  1.0
  W  W14  1  0.249  0.071  0.763  1.0
  W  W15  1  0.251  0.071  0.263  1.0
  O  O16  1  0.384  0.994  0.906  1.0
  O  O17  1  0.089  0.943  0.849  1.0
  O  O18  1  0.282  0.895  0.664  1.0
  O  O19  1  0.116  0.994  0.406  1.0
  O  O20  1  0.411  0.943  0.349  1.0
  O  O21  1  0.619  0.773  0.920  1.0
  O  O22  1  0.865  0.732  0.861  1.0
  O  O23  1  0.218  0.895  0.164  1.0
  O  O24  1  0.682  0.741  0.639  1.0
  O  O25  1  0.881  0.773  0.420  1.0
  O  O26  1  0.103  0.559  0.891  1.0
  O  O27  1  0.635  0.732  0.361  1.0
  O  O28  1  0.406  0.504  0.818  1.0
  O  O29  1  0.818  0.741  0.139  1.0
  O  O30  1  0.204  0.597  0.567  1.0
  O  O31  1  0.704  0.403  0.933  1.0
  O  O32  1  0.906  0.496  0.682  1.0
  O  O33  1  0.397  0.559  0.391  1.0
  O  O34  1  0.603  0.441  0.609  1.0
  O  O35  1  0.094  0.504  0.318  1.0
  O  O36  1  0.296  0.597  0.067  1.0
  O  O37  1  0.796  0.403  0.433  1.0
  O  O38  1  0.182  0.259  0.861  1.0
  O  O39  1  0.594  0.496  0.182  1.0
  O  O40  1  0.365  0.268  0.639  1.0
  O  O41  1  0.897  0.441  0.109  1.0
  O  O42  1  0.119  0.227  0.580  1.0
  O  O43  1  0.318  0.259  0.361  1.0
  O  O44  1  0.782  0.105  0.836  1.0
  O  O45  1  0.135  0.268  0.139  1.0
  O  O46  1  0.381  0.227  0.080  1.0
  O  O47  1  0.589  0.057  0.651  1.0
  O  O48  1  0.884  0.006  0.594  1.0
  O  O49  1  0.718  0.105  0.336  1.0
  O  O50  1  0.911  0.057  0.151  1.0
  O  O51  1  0.616  0.006  0.094  1.0
[/CIF]
.