The crystal structure described by Na2W2O5 crystallizes in the orthorhombic Ima2 space group. Na(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(2), and four equivalent O(1) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form WO6 octahedra that share corners with four equivalent W(1)O6 octahedra and corners with two equivalent W(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 18°. In the second W site, W(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form WO4 tetrahedra that share corners with two equivalent W(1)O6 octahedra and corners with two equivalent W(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Na(1) and two equivalent W(1) atoms to form distorted ONa4W2 octahedra that share corners with two equivalent O(1)Na4W2 octahedra, corners with four equivalent O(3)Na2W2 tetrahedra, edges with two equivalent O(1)Na4W2 octahedra, and faces with four equivalent O(1)Na4W2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one W(1), and one W(2) atom. In the third O site, O(3) is bonded to two equivalent Na(1) and two equivalent W(2) atoms to form distorted ONa2W2 tetrahedra that share corners with eight equivalent O(1)Na4W2 octahedra and corners with two equivalent O(3)Na2W2 tetrahedra. The corner-sharing octahedral tilt angles range from 21-86°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2W2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.507
_cell_length_b   8.507
_cell_length_c   8.507
_cell_angle_alpha   140.725
_cell_angle_beta   140.046
_cell_angle_gamma   57.270
_symmetry_Int_Tables_number   1
_cell_volume   248.198
_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
  Na  Na0  1  0.926  0.394  0.528  1.0
  Na  Na1  1  0.074  0.602  0.468  1.0
  Na  Na2  1  0.367  0.894  0.468  1.0
  Na  Na3  1  0.633  0.102  0.528  1.0
  W  W4  1  0.000  0.024  0.024  1.0
  W  W5  1  0.500  0.524  0.024  1.0
  W  W6  1  0.692  0.680  0.872  1.0
  W  W7  1  0.308  0.180  0.989  1.0
  O  O8  1  0.273  0.294  0.524  1.0
  O  O9  1  0.727  0.250  0.020  1.0
  O  O10  1  0.270  0.794  0.020  1.0
  O  O11  1  0.730  0.750  0.524  1.0
  O  O12  1  0.943  0.901  0.125  1.0
  O  O13  1  0.057  0.182  0.958  1.0
  O  O14  1  0.276  0.401  0.958  1.0
  O  O15  1  0.724  0.682  0.125  1.0
  O  O16  1  0.625  0.337  0.461  1.0
  O  O17  1  0.375  0.837  0.712  1.0
[/CIF]
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The crystal structure described by Na2W2O5 crystallizes in the orthorhombic Ima2 space group. Na(1) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(2), and four equivalent O(1) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form WO6 octahedra that share corners with four equivalent W(1)O6 octahedra and corners with two equivalent W(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 18°. In the second W site, W(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form WO4 tetrahedra that share corners with two equivalent W(1)O6 octahedra and corners with two equivalent W(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Na(1) and two equivalent W(1) atoms to form distorted ONa4W2 octahedra that share corners with two equivalent O(1)Na4W2 octahedra, corners with four equivalent O(3)Na2W2 tetrahedra, edges with two equivalent O(1)Na4W2 octahedra, and faces with four equivalent O(1)Na4W2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one W(1), and one W(2) atom. In the third O site, O(3) is bonded to two equivalent Na(1) and two equivalent W(2) atoms to form distorted ONa2W2 tetrahedra that share corners with eight equivalent O(1)Na4W2 octahedra and corners with two equivalent O(3)Na2W2 tetrahedra. The corner-sharing octahedral tilt angles range from 21-86°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2W2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.507
_cell_length_b   8.507
_cell_length_c   8.507
_cell_angle_alpha   140.725
_cell_angle_beta   140.046
_cell_angle_gamma   57.270
_symmetry_Int_Tables_number   1
_cell_volume   248.198
_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
  Na  Na0  1  0.926  0.394  0.528  1.0
  Na  Na1  1  0.074  0.602  0.468  1.0
  Na  Na2  1  0.367  0.894  0.468  1.0
  Na  Na3  1  0.633  0.102  0.528  1.0
  W  W4  1  0.000  0.024  0.024  1.0
  W  W5  1  0.500  0.524  0.024  1.0
  W  W6  1  0.692  0.680  0.872  1.0
  W  W7  1  0.308  0.180  0.989  1.0
  O  O8  1  0.273  0.294  0.524  1.0
  O  O9  1  0.727  0.250  0.020  1.0
  O  O10  1  0.270  0.794  0.020  1.0
  O  O11  1  0.730  0.750  0.524  1.0
  O  O12  1  0.943  0.901  0.125  1.0
  O  O13  1  0.057  0.182  0.958  1.0
  O  O14  1  0.276  0.401  0.958  1.0
  O  O15  1  0.724  0.682  0.125  1.0
  O  O16  1  0.625  0.337  0.461  1.0
  O  O17  1  0.375  0.837  0.712  1.0
[/CIF]
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