The crystal structure described by Na(FeO2)2 is Spinel structured and crystallizes in the orthorhombic Imma space group. Na(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form NaO4 tetrahedra that share corners with six equivalent Fe(1)O6 octahedra and corners with six equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-65°. 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 FeO6 octahedra that share corners with six equivalent Na(1)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Fe(2)O6 octahedra. In the second Fe site, Fe(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form FeO6 octahedra that share corners with six equivalent Na(1)O4 tetrahedra, edges with two equivalent Fe(2)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Fe(2), and two equivalent Fe(1) atoms to form a mixture of edge and corner-sharing ONaFe3 tetrahedra. In the second O site, O(2) is bonded to one Na(1), one Fe(1), and two equivalent Fe(2) atoms to form a mixture of distorted edge and corner-sharing ONaFe3 tetrahedra. is represented by the CIF file [CIF]
data_Na(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.113
_cell_length_b   6.113
_cell_length_c   6.113
_cell_angle_alpha   120.655
_cell_angle_beta   119.175
_cell_angle_gamma   90.152
_symmetry_Int_Tables_number   1
_cell_volume   161.672
_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  0.875  0.125  0.750  1.0
  Na  Na1  1  0.125  0.875  0.250  1.0
  Fe  Fe2  1  0.000  0.500  0.500  1.0
  Fe  Fe3  1  0.500  0.000  0.000  1.0
  Fe  Fe4  1  0.500  0.500  0.000  1.0
  Fe  Fe5  1  0.500  0.500  0.500  1.0
  O  O6  1  0.722  0.252  0.030  1.0
  O  O7  1  0.716  0.262  0.454  1.0
  O  O8  1  0.722  0.692  0.470  1.0
  O  O9  1  0.308  0.262  0.046  1.0
  O  O10  1  0.692  0.738  0.954  1.0
  O  O11  1  0.278  0.308  0.530  1.0
  O  O12  1  0.278  0.748  0.970  1.0
  O  O13  1  0.284  0.738  0.546  1.0
[/CIF]
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The crystal structure described by Na(FeO2)2 is Spinel structured and crystallizes in the orthorhombic Imma space group. Na(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form NaO4 tetrahedra that share corners with six equivalent Fe(1)O6 octahedra and corners with six equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 58-65°. 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 FeO6 octahedra that share corners with six equivalent Na(1)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with four equivalent Fe(2)O6 octahedra. In the second Fe site, Fe(2) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form FeO6 octahedra that share corners with six equivalent Na(1)O4 tetrahedra, edges with two equivalent Fe(2)O6 octahedra, and edges with four equivalent Fe(1)O6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Fe(2), and two equivalent Fe(1) atoms to form a mixture of edge and corner-sharing ONaFe3 tetrahedra. In the second O site, O(2) is bonded to one Na(1), one Fe(1), and two equivalent Fe(2) atoms to form a mixture of distorted edge and corner-sharing ONaFe3 tetrahedra. is represented by the CIF file [CIF]
data_Na(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.113
_cell_length_b   6.113
_cell_length_c   6.113
_cell_angle_alpha   120.655
_cell_angle_beta   119.175
_cell_angle_gamma   90.152
_symmetry_Int_Tables_number   1
_cell_volume   161.672
_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  0.875  0.125  0.750  1.0
  Na  Na1  1  0.125  0.875  0.250  1.0
  Fe  Fe2  1  0.000  0.500  0.500  1.0
  Fe  Fe3  1  0.500  0.000  0.000  1.0
  Fe  Fe4  1  0.500  0.500  0.000  1.0
  Fe  Fe5  1  0.500  0.500  0.500  1.0
  O  O6  1  0.722  0.252  0.030  1.0
  O  O7  1  0.716  0.262  0.454  1.0
  O  O8  1  0.722  0.692  0.470  1.0
  O  O9  1  0.308  0.262  0.046  1.0
  O  O10  1  0.692  0.738  0.954  1.0
  O  O11  1  0.278  0.308  0.530  1.0
  O  O12  1  0.278  0.748  0.970  1.0
  O  O13  1  0.284  0.738  0.546  1.0
[/CIF]
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