The material described by La2W2O9 crystallizes in the triclinic P-1 space group. There are two inequivalent La sites. In the first La site, La(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(6) atoms. In the second La site, La(2) is bonded in a 10-coordinate geometry to one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), two equivalent O(1), and two equivalent O(9) 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(7), one O(8), and one O(9) atom to form corner-sharing WO5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 41-48°. In the second W site, W(2) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form distorted corner-sharing WO6 octahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent La(2) and one W(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one La(1), one W(1), and one W(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the sixth O site, O(6) is bonded to one La(2), two equivalent La(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing OLa3W tetrahedra. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(1), one La(2), one W(1), and one W(2) atom. In the ninth O site, O(9) is bonded to one La(1), two equivalent La(2), and one W(1) atom to form a mixture of distorted corner and edge-sharing OLa3W tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_La2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.044
_cell_length_b   7.301
_cell_length_c   7.309
_cell_angle_alpha   70.423
_cell_angle_beta   84.943
_cell_angle_gamma   83.255
_symmetry_Int_Tables_number   1
_cell_volume   351.234
_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
  La  La0  1  0.843  0.741  0.848  1.0
  La  La1  1  0.157  0.259  0.152  1.0
  La  La2  1  0.376  0.727  0.590  1.0
  La  La3  1  0.624  0.273  0.410  1.0
  W  W4  1  0.157  0.203  0.645  1.0
  W  W5  1  0.843  0.797  0.355  1.0
  W  W6  1  0.723  0.270  0.939  1.0
  W  W7  1  0.277  0.730  0.061  1.0
  O  O8  1  0.347  0.351  0.646  1.0
  O  O9  1  0.653  0.649  0.354  1.0
  O  O10  1  0.014  0.275  0.848  1.0
  O  O11  1  0.986  0.725  0.152  1.0
  O  O12  1  0.492  0.770  0.904  1.0
  O  O13  1  0.508  0.230  0.096  1.0
  O  O14  1  0.660  0.491  0.745  1.0
  O  O15  1  0.340  0.509  0.255  1.0
  O  O16  1  0.272  0.915  0.179  1.0
  O  O17  1  0.728  0.085  0.821  1.0
  O  O18  1  0.812  0.419  0.090  1.0
  O  O19  1  0.188  0.581  0.910  1.0
  O  O20  1  0.977  0.294  0.465  1.0
  O  O21  1  0.023  0.706  0.535  1.0
  O  O22  1  0.856  0.056  0.199  1.0
  O  O23  1  0.144  0.944  0.801  1.0
  O  O24  1  0.318  0.096  0.471  1.0
  O  O25  1  0.682  0.904  0.529  1.0
[/CIF]
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The material described by La2W2O9 crystallizes in the triclinic P-1 space group. There are two inequivalent La sites. In the first La site, La(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(6) atoms. In the second La site, La(2) is bonded in a 10-coordinate geometry to one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), two equivalent O(1), and two equivalent O(9) 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(7), one O(8), and one O(9) atom to form corner-sharing WO5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 41-48°. In the second W site, W(2) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form distorted corner-sharing WO6 octahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent La(2) and one W(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one La(1), one W(1), and one W(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(2) atom. In the sixth O site, O(6) is bonded to one La(2), two equivalent La(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing OLa3W tetrahedra. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(1), one La(2), one W(1), and one W(2) atom. In the ninth O site, O(9) is bonded to one La(1), two equivalent La(2), and one W(1) atom to form a mixture of distorted corner and edge-sharing OLa3W tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_La2W2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.044
_cell_length_b   7.301
_cell_length_c   7.309
_cell_angle_alpha   70.423
_cell_angle_beta   84.943
_cell_angle_gamma   83.255
_symmetry_Int_Tables_number   1
_cell_volume   351.234
_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
  La  La0  1  0.843  0.741  0.848  1.0
  La  La1  1  0.157  0.259  0.152  1.0
  La  La2  1  0.376  0.727  0.590  1.0
  La  La3  1  0.624  0.273  0.410  1.0
  W  W4  1  0.157  0.203  0.645  1.0
  W  W5  1  0.843  0.797  0.355  1.0
  W  W6  1  0.723  0.270  0.939  1.0
  W  W7  1  0.277  0.730  0.061  1.0
  O  O8  1  0.347  0.351  0.646  1.0
  O  O9  1  0.653  0.649  0.354  1.0
  O  O10  1  0.014  0.275  0.848  1.0
  O  O11  1  0.986  0.725  0.152  1.0
  O  O12  1  0.492  0.770  0.904  1.0
  O  O13  1  0.508  0.230  0.096  1.0
  O  O14  1  0.660  0.491  0.745  1.0
  O  O15  1  0.340  0.509  0.255  1.0
  O  O16  1  0.272  0.915  0.179  1.0
  O  O17  1  0.728  0.085  0.821  1.0
  O  O18  1  0.812  0.419  0.090  1.0
  O  O19  1  0.188  0.581  0.910  1.0
  O  O20  1  0.977  0.294  0.465  1.0
  O  O21  1  0.023  0.706  0.535  1.0
  O  O22  1  0.856  0.056  0.199  1.0
  O  O23  1  0.144  0.944  0.801  1.0
  O  O24  1  0.318  0.096  0.471  1.0
  O  O25  1  0.682  0.904  0.529  1.0
[/CIF]
.