The crystal structure described by Na(FeO2)2 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form edge-sharing FeO6 octahedra. In the second Fe site, Fe(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing FeO6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Fe(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded to two equivalent Na(1), one Fe(1), and two equivalent Fe(2) atoms to form a mixture of distorted corner and edge-sharing ONa2Fe3 square pyramids. is represented by the CIF file [CIF]
data_Na(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.038
_cell_length_b   5.127
_cell_length_c   5.861
_cell_angle_alpha   106.160
_cell_angle_beta   90.854
_cell_angle_gamma   91.481
_symmetry_Int_Tables_number   1
_cell_volume   87.628
_cell_formula_units_Z   1
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  0.000  0.500  0.500  1.0
  Fe  Fe1  1  0.500  0.500  0.000  1.0
  Fe  Fe2  1  0.000  0.000  0.000  1.0
  O  O3  1  0.033  0.281  0.815  1.0
  O  O4  1  0.491  0.758  0.815  1.0
  O  O5  1  0.967  0.719  0.185  1.0
  O  O6  1  0.509  0.242  0.185  1.0
[/CIF]
.
The crystal structure described by Na(FeO2)2 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form edge-sharing FeO6 octahedra. In the second Fe site, Fe(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing FeO6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Fe(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded to two equivalent Na(1), one Fe(1), and two equivalent Fe(2) atoms to form a mixture of distorted corner and edge-sharing ONa2Fe3 square pyramids. is represented by the CIF file [CIF]
data_Na(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.038
_cell_length_b   5.127
_cell_length_c   5.861
_cell_angle_alpha   106.160
_cell_angle_beta   90.854
_cell_angle_gamma   91.481
_symmetry_Int_Tables_number   1
_cell_volume   87.628
_cell_formula_units_Z   1
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  0.000  0.500  0.500  1.0
  Fe  Fe1  1  0.500  0.500  0.000  1.0
  Fe  Fe2  1  0.000  0.000  0.000  1.0
  O  O3  1  0.033  0.281  0.815  1.0
  O  O4  1  0.491  0.758  0.815  1.0
  O  O5  1  0.967  0.719  0.185  1.0
  O  O6  1  0.509  0.242  0.185  1.0
[/CIF]
.