The material structure described by Na2SO9 crystallizes in the tetragonal P4_322 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 2-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. S(1) is bonded in a distorted see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one S(1) atom. In the second O site, O(5) is bonded in a distorted water-like geometry to one Na(2) and one O(2) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent S(1) atoms. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one O(5) atom. In the fifth O site, O(3) is bonded in a distorted L-shaped geometry to one Na(2) and one O(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2SO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.579
_cell_length_b   7.579
_cell_length_c   12.107
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   695.523
_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
  Na  Na0  1  0.722  0.500  0.750  1.0
  Na  Na1  1  0.278  0.500  0.250  1.0
  Na  Na2  1  0.500  0.722  0.500  1.0
  Na  Na3  1  0.500  0.278  0.000  1.0
  Na  Na4  1  0.000  0.800  0.000  1.0
  Na  Na5  1  0.000  0.200  0.500  1.0
  Na  Na6  1  0.200  0.000  0.750  1.0
  Na  Na7  1  0.800  0.000  0.250  1.0
  S  S8  1  0.654  0.500  0.250  1.0
  S  S9  1  0.346  0.500  0.750  1.0
  S  S10  1  0.500  0.654  0.000  1.0
  S  S11  1  0.500  0.346  0.500  1.0
  O  O12  1  0.324  0.324  0.625  1.0
  O  O13  1  0.676  0.676  0.125  1.0
  O  O14  1  0.676  0.324  0.375  1.0
  O  O15  1  0.324  0.676  0.875  1.0
  O  O16  1  0.074  0.753  0.242  1.0
  O  O17  1  0.926  0.247  0.742  1.0
  O  O18  1  0.247  0.074  0.992  1.0
  O  O19  1  0.753  0.926  0.492  1.0
  O  O20  1  0.926  0.753  0.758  1.0
  O  O21  1  0.074  0.247  0.258  1.0
  O  O22  1  0.753  0.074  0.008  1.0
  O  O23  1  0.247  0.926  0.508  1.0
  O  O24  1  0.011  0.523  0.551  1.0
  O  O25  1  0.989  0.477  0.051  1.0
  O  O26  1  0.477  0.011  0.301  1.0
  O  O27  1  0.523  0.989  0.801  1.0
  O  O28  1  0.989  0.523  0.449  1.0
  O  O29  1  0.011  0.477  0.949  1.0
  O  O30  1  0.523  0.011  0.699  1.0
  O  O31  1  0.477  0.989  0.199  1.0
  O  O32  1  0.633  0.555  0.935  1.0
  O  O33  1  0.367  0.445  0.435  1.0
  O  O34  1  0.445  0.633  0.685  1.0
  O  O35  1  0.555  0.367  0.185  1.0
  O  O36  1  0.367  0.555  0.065  1.0
  O  O37  1  0.633  0.445  0.565  1.0
  O  O38  1  0.555  0.633  0.315  1.0
  O  O39  1  0.445  0.367  0.815  1.0
  O  O40  1  0.860  0.865  0.420  1.0
  O  O41  1  0.140  0.135  0.920  1.0
  O  O42  1  0.135  0.860  0.170  1.0
  O  O43  1  0.865  0.140  0.670  1.0
  O  O44  1  0.140  0.865  0.580  1.0
  O  O45  1  0.860  0.135  0.080  1.0
  O  O46  1  0.865  0.860  0.830  1.0
  O  O47  1  0.135  0.140  0.330  1.0
[/CIF]
.
The material structure described by Na2SO9 crystallizes in the tetragonal P4_322 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 2-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. S(1) is bonded in a distorted see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one S(1) atom. In the second O site, O(5) is bonded in a distorted water-like geometry to one Na(2) and one O(2) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent S(1) atoms. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one O(5) atom. In the fifth O site, O(3) is bonded in a distorted L-shaped geometry to one Na(2) and one O(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2SO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.579
_cell_length_b   7.579
_cell_length_c   12.107
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   695.523
_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
  Na  Na0  1  0.722  0.500  0.750  1.0
  Na  Na1  1  0.278  0.500  0.250  1.0
  Na  Na2  1  0.500  0.722  0.500  1.0
  Na  Na3  1  0.500  0.278  0.000  1.0
  Na  Na4  1  0.000  0.800  0.000  1.0
  Na  Na5  1  0.000  0.200  0.500  1.0
  Na  Na6  1  0.200  0.000  0.750  1.0
  Na  Na7  1  0.800  0.000  0.250  1.0
  S  S8  1  0.654  0.500  0.250  1.0
  S  S9  1  0.346  0.500  0.750  1.0
  S  S10  1  0.500  0.654  0.000  1.0
  S  S11  1  0.500  0.346  0.500  1.0
  O  O12  1  0.324  0.324  0.625  1.0
  O  O13  1  0.676  0.676  0.125  1.0
  O  O14  1  0.676  0.324  0.375  1.0
  O  O15  1  0.324  0.676  0.875  1.0
  O  O16  1  0.074  0.753  0.242  1.0
  O  O17  1  0.926  0.247  0.742  1.0
  O  O18  1  0.247  0.074  0.992  1.0
  O  O19  1  0.753  0.926  0.492  1.0
  O  O20  1  0.926  0.753  0.758  1.0
  O  O21  1  0.074  0.247  0.258  1.0
  O  O22  1  0.753  0.074  0.008  1.0
  O  O23  1  0.247  0.926  0.508  1.0
  O  O24  1  0.011  0.523  0.551  1.0
  O  O25  1  0.989  0.477  0.051  1.0
  O  O26  1  0.477  0.011  0.301  1.0
  O  O27  1  0.523  0.989  0.801  1.0
  O  O28  1  0.989  0.523  0.449  1.0
  O  O29  1  0.011  0.477  0.949  1.0
  O  O30  1  0.523  0.011  0.699  1.0
  O  O31  1  0.477  0.989  0.199  1.0
  O  O32  1  0.633  0.555  0.935  1.0
  O  O33  1  0.367  0.445  0.435  1.0
  O  O34  1  0.445  0.633  0.685  1.0
  O  O35  1  0.555  0.367  0.185  1.0
  O  O36  1  0.367  0.555  0.065  1.0
  O  O37  1  0.633  0.445  0.565  1.0
  O  O38  1  0.555  0.633  0.315  1.0
  O  O39  1  0.445  0.367  0.815  1.0
  O  O40  1  0.860  0.865  0.420  1.0
  O  O41  1  0.140  0.135  0.920  1.0
  O  O42  1  0.135  0.860  0.170  1.0
  O  O43  1  0.865  0.140  0.670  1.0
  O  O44  1  0.140  0.865  0.580  1.0
  O  O45  1  0.860  0.135  0.080  1.0
  O  O46  1  0.865  0.860  0.830  1.0
  O  O47  1  0.135  0.140  0.330  1.0
[/CIF]
.