The structure described by Gd2W2O9 crystallizes in the orthorhombic C222_1 space group. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(8) atom. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to two equivalent O(10), two equivalent O(3), two equivalent O(5), and two equivalent O(8) atoms. In the third Gd site, Gd(3) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(10), two equivalent O(5), and two equivalent O(8) atoms. There are three inequivalent W sites. In the first W site, W(1) is bonded to one O(2), two equivalent O(10), and two equivalent O(11) atoms to form corner-sharing WO5 trigonal bipyramids. In the second W site, W(2) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 32-37°. In the third W site, W(3) is bonded to two equivalent O(6), two equivalent O(7), and two equivalent O(9) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 35-42°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(3), and one W(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Gd(1) and one W(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(2), and one W(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent W(2) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Gd(1), one Gd(2), one Gd(3), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one W(2) and one W(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one W(2) and one W(3) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Gd(1), one Gd(2), and one Gd(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to two equivalent W(3) atoms. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Gd(1), one Gd(2), one Gd(3), and one W(1) atom. In the eleventh O site, O(11) is bonded in a linear geometry to two equivalent W(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Gd2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.855
_cell_length_b   9.855
_cell_length_c   7.251
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   105.714
_symmetry_Int_Tables_number   1
_cell_volume   677.983
_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  0.120  0.409  0.496  1.0
  Gd  Gd1  1  0.409  0.120  0.504  1.0
  Gd  Gd2  1  0.771  0.229  0.250  1.0
  Gd  Gd3  1  0.775  0.225  0.750  1.0
  Gd  Gd4  1  0.225  0.775  0.250  1.0
  Gd  Gd5  1  0.229  0.771  0.750  1.0
  Gd  Gd6  1  0.591  0.880  0.004  1.0
  Gd  Gd7  1  0.880  0.591  0.996  1.0
  W  W8  1  0.955  0.955  0.000  1.0
  W  W9  1  0.150  0.394  0.997  1.0
  W  W10  1  0.394  0.150  0.003  1.0
  W  W11  1  0.500  0.500  0.250  1.0
  W  W12  1  0.500  0.500  0.750  1.0
  W  W13  1  0.606  0.850  0.503  1.0
  W  W14  1  0.850  0.606  0.497  1.0
  W  W15  1  0.045  0.045  0.500  1.0
  O  O16  1  0.330  0.033  0.204  1.0
  O  O17  1  0.033  0.330  0.796  1.0
  O  O18  1  0.199  0.199  0.500  1.0
  O  O19  1  0.333  0.033  0.801  1.0
  O  O20  1  0.033  0.333  0.199  1.0
  O  O21  1  0.226  0.226  0.000  1.0
  O  O22  1  0.114  0.577  0.996  1.0
  O  O23  1  0.577  0.114  0.004  1.0
  O  O24  1  0.305  0.476  0.187  1.0
  O  O25  1  0.476  0.305  0.813  1.0
  O  O26  1  0.304  0.477  0.808  1.0
  O  O27  1  0.477  0.304  0.192  1.0
  O  O28  1  0.630  0.209  0.504  1.0
  O  O29  1  0.209  0.630  0.496  1.0
  O  O30  1  0.442  0.442  0.500  1.0
  O  O31  1  0.089  0.849  0.991  1.0
  O  O32  1  0.849  0.089  0.009  1.0
  O  O33  1  0.995  0.005  0.750  1.0
  O  O34  1  0.005  0.995  0.250  1.0
  O  O35  1  0.151  0.911  0.509  1.0
  O  O36  1  0.911  0.151  0.491  1.0
  O  O37  1  0.558  0.558  0.000  1.0
  O  O38  1  0.370  0.791  0.004  1.0
  O  O39  1  0.791  0.370  0.996  1.0
  O  O40  1  0.523  0.696  0.692  1.0
  O  O41  1  0.696  0.523  0.308  1.0
  O  O42  1  0.524  0.695  0.313  1.0
  O  O43  1  0.695  0.524  0.687  1.0
  O  O44  1  0.886  0.423  0.496  1.0
  O  O45  1  0.423  0.886  0.504  1.0
  O  O46  1  0.774  0.774  0.500  1.0
  O  O47  1  0.967  0.667  0.699  1.0
  O  O48  1  0.667  0.967  0.301  1.0
  O  O49  1  0.801  0.801  0.000  1.0
  O  O50  1  0.967  0.670  0.296  1.0
  O  O51  1  0.670  0.967  0.704  1.0
[/CIF]
.
The structure described by Gd2W2O9 crystallizes in the orthorhombic C222_1 space group. There are three inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(8) atom. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to two equivalent O(10), two equivalent O(3), two equivalent O(5), and two equivalent O(8) atoms. In the third Gd site, Gd(3) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(10), two equivalent O(5), and two equivalent O(8) atoms. There are three inequivalent W sites. In the first W site, W(1) is bonded to one O(2), two equivalent O(10), and two equivalent O(11) atoms to form corner-sharing WO5 trigonal bipyramids. In the second W site, W(2) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 32-37°. In the third W site, W(3) is bonded to two equivalent O(6), two equivalent O(7), and two equivalent O(9) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 35-42°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(3), and one W(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Gd(1) and one W(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Gd(1), one Gd(2), and one W(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent W(2) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Gd(1), one Gd(2), one Gd(3), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one W(2) and one W(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one W(2) and one W(3) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Gd(1), one Gd(2), and one Gd(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to two equivalent W(3) atoms. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Gd(1), one Gd(2), one Gd(3), and one W(1) atom. In the eleventh O site, O(11) is bonded in a linear geometry to two equivalent W(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Gd2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.855
_cell_length_b   9.855
_cell_length_c   7.251
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   105.714
_symmetry_Int_Tables_number   1
_cell_volume   677.983
_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  0.120  0.409  0.496  1.0
  Gd  Gd1  1  0.409  0.120  0.504  1.0
  Gd  Gd2  1  0.771  0.229  0.250  1.0
  Gd  Gd3  1  0.775  0.225  0.750  1.0
  Gd  Gd4  1  0.225  0.775  0.250  1.0
  Gd  Gd5  1  0.229  0.771  0.750  1.0
  Gd  Gd6  1  0.591  0.880  0.004  1.0
  Gd  Gd7  1  0.880  0.591  0.996  1.0
  W  W8  1  0.955  0.955  0.000  1.0
  W  W9  1  0.150  0.394  0.997  1.0
  W  W10  1  0.394  0.150  0.003  1.0
  W  W11  1  0.500  0.500  0.250  1.0
  W  W12  1  0.500  0.500  0.750  1.0
  W  W13  1  0.606  0.850  0.503  1.0
  W  W14  1  0.850  0.606  0.497  1.0
  W  W15  1  0.045  0.045  0.500  1.0
  O  O16  1  0.330  0.033  0.204  1.0
  O  O17  1  0.033  0.330  0.796  1.0
  O  O18  1  0.199  0.199  0.500  1.0
  O  O19  1  0.333  0.033  0.801  1.0
  O  O20  1  0.033  0.333  0.199  1.0
  O  O21  1  0.226  0.226  0.000  1.0
  O  O22  1  0.114  0.577  0.996  1.0
  O  O23  1  0.577  0.114  0.004  1.0
  O  O24  1  0.305  0.476  0.187  1.0
  O  O25  1  0.476  0.305  0.813  1.0
  O  O26  1  0.304  0.477  0.808  1.0
  O  O27  1  0.477  0.304  0.192  1.0
  O  O28  1  0.630  0.209  0.504  1.0
  O  O29  1  0.209  0.630  0.496  1.0
  O  O30  1  0.442  0.442  0.500  1.0
  O  O31  1  0.089  0.849  0.991  1.0
  O  O32  1  0.849  0.089  0.009  1.0
  O  O33  1  0.995  0.005  0.750  1.0
  O  O34  1  0.005  0.995  0.250  1.0
  O  O35  1  0.151  0.911  0.509  1.0
  O  O36  1  0.911  0.151  0.491  1.0
  O  O37  1  0.558  0.558  0.000  1.0
  O  O38  1  0.370  0.791  0.004  1.0
  O  O39  1  0.791  0.370  0.996  1.0
  O  O40  1  0.523  0.696  0.692  1.0
  O  O41  1  0.696  0.523  0.308  1.0
  O  O42  1  0.524  0.695  0.313  1.0
  O  O43  1  0.695  0.524  0.687  1.0
  O  O44  1  0.886  0.423  0.496  1.0
  O  O45  1  0.423  0.886  0.504  1.0
  O  O46  1  0.774  0.774  0.500  1.0
  O  O47  1  0.967  0.667  0.699  1.0
  O  O48  1  0.667  0.967  0.301  1.0
  O  O49  1  0.801  0.801  0.000  1.0
  O  O50  1  0.967  0.670  0.296  1.0
  O  O51  1  0.670  0.967  0.704  1.0
[/CIF]
.