The compound described by NaFeO2 crystallizes in the orthorhombic P2_12_12_1 space group. Na(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form distorted NaO4 tetrahedra that share corners with four equivalent Na(1)O4 tetrahedra, corners with six equivalent Fe(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. Fe(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form FeO4 tetrahedra that share corners with four equivalent Fe(1)O4 tetrahedra, corners with six equivalent Na(1)O4 tetrahedra, and  an edgeedge with one Na(1)O4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(1) and two equivalent Fe(1) atoms to form a mixture of corner and edge-sharing ONa2Fe2 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Na(1) and two equivalent Fe(1) atoms to form a mixture of corner and edge-sharing ONa2Fe2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaFeO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.638
_cell_length_b   5.672
_cell_length_c   7.279
_cell_angle_alpha   90.000
_cell_angle_beta   90.001
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   232.784
_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  0.802  0.803  1.000  1.0
  Na  Na1  1  0.302  0.697  0.750  1.0
  Na  Na2  1  0.698  0.303  0.250  1.0
  Na  Na3  1  0.198  0.197  0.500  1.0
  Fe  Fe4  1  0.314  0.688  0.250  1.0
  Fe  Fe5  1  0.186  0.188  1.000  1.0
  Fe  Fe6  1  0.814  0.812  0.500  1.0
  Fe  Fe7  1  0.686  0.312  0.750  1.0
  O  O8  1  0.146  0.778  0.463  1.0
  O  O9  1  0.854  0.222  0.963  1.0
  O  O10  1  0.779  0.147  0.535  1.0
  O  O11  1  0.279  0.353  0.215  1.0
  O  O12  1  0.721  0.647  0.715  1.0
  O  O13  1  0.221  0.853  0.035  1.0
  O  O14  1  0.646  0.722  0.287  1.0
  O  O15  1  0.354  0.278  0.787  1.0
[/CIF]
.
The compound described by NaFeO2 crystallizes in the orthorhombic P2_12_12_1 space group. Na(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form distorted NaO4 tetrahedra that share corners with four equivalent Na(1)O4 tetrahedra, corners with six equivalent Fe(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. Fe(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form FeO4 tetrahedra that share corners with four equivalent Fe(1)O4 tetrahedra, corners with six equivalent Na(1)O4 tetrahedra, and  an edgeedge with one Na(1)O4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(1) and two equivalent Fe(1) atoms to form a mixture of corner and edge-sharing ONa2Fe2 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Na(1) and two equivalent Fe(1) atoms to form a mixture of corner and edge-sharing ONa2Fe2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaFeO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.638
_cell_length_b   5.672
_cell_length_c   7.279
_cell_angle_alpha   90.000
_cell_angle_beta   90.001
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   232.784
_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  0.802  0.803  1.000  1.0
  Na  Na1  1  0.302  0.697  0.750  1.0
  Na  Na2  1  0.698  0.303  0.250  1.0
  Na  Na3  1  0.198  0.197  0.500  1.0
  Fe  Fe4  1  0.314  0.688  0.250  1.0
  Fe  Fe5  1  0.186  0.188  1.000  1.0
  Fe  Fe6  1  0.814  0.812  0.500  1.0
  Fe  Fe7  1  0.686  0.312  0.750  1.0
  O  O8  1  0.146  0.778  0.463  1.0
  O  O9  1  0.854  0.222  0.963  1.0
  O  O10  1  0.779  0.147  0.535  1.0
  O  O11  1  0.279  0.353  0.215  1.0
  O  O12  1  0.721  0.647  0.715  1.0
  O  O13  1  0.221  0.853  0.035  1.0
  O  O14  1  0.646  0.722  0.287  1.0
  O  O15  1  0.354  0.278  0.787  1.0
[/CIF]
.