The structure described by Na2FeO4 is Sylvanite-like structured and crystallizes in the orthorhombic Pnnm 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(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form distorted NaO6 octahedra that share corners with four equivalent Na(2)O6 octahedra, corners with four equivalent Fe(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 27°. Fe(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form FeO4 tetrahedra that share corners with four equivalent Na(2)O6 octahedra and  an edgeedge with one Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-72°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one Fe(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(2), two equivalent Na(1), and one Fe(1) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), two equivalent Na(1), and one Fe(1) atom. is represented by the CIF file [CIF]
data_Na2FeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.158
_cell_length_b   7.572
_cell_length_c   7.645
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   414.330
_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  0.741  0.500  0.000  1.0
  Na  Na1  1  0.259  0.500  0.000  1.0
  Na  Na2  1  0.000  0.737  0.267  1.0
  Na  Na3  1  0.500  0.237  0.233  1.0
  Na  Na4  1  0.759  0.000  0.500  1.0
  Na  Na5  1  0.241  0.000  0.500  1.0
  Na  Na6  1  0.500  0.763  0.767  1.0
  Na  Na7  1  0.000  0.263  0.733  1.0
  Fe  Fe8  1  0.000  0.221  0.148  1.0
  Fe  Fe9  1  0.500  0.721  0.352  1.0
  Fe  Fe10  1  0.500  0.279  0.648  1.0
  Fe  Fe11  1  0.000  0.779  0.852  1.0
  O  O12  1  0.811  0.203  0.023  1.0
  O  O13  1  0.189  0.203  0.023  1.0
  O  O14  1  0.500  0.568  0.194  1.0
  O  O15  1  0.000  0.431  0.215  1.0
  O  O16  1  0.500  0.931  0.285  1.0
  O  O17  1  0.000  0.068  0.306  1.0
  O  O18  1  0.689  0.703  0.477  1.0
  O  O19  1  0.311  0.703  0.477  1.0
  O  O20  1  0.689  0.297  0.523  1.0
  O  O21  1  0.311  0.297  0.523  1.0
  O  O22  1  0.000  0.932  0.694  1.0
  O  O23  1  0.500  0.069  0.715  1.0
  O  O24  1  0.000  0.569  0.785  1.0
  O  O25  1  0.500  0.432  0.806  1.0
  O  O26  1  0.811  0.797  0.977  1.0
  O  O27  1  0.189  0.797  0.977  1.0
[/CIF]
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The structure described by Na2FeO4 is Sylvanite-like structured and crystallizes in the orthorhombic Pnnm 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(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form distorted NaO6 octahedra that share corners with four equivalent Na(2)O6 octahedra, corners with four equivalent Fe(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 27°. Fe(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form FeO4 tetrahedra that share corners with four equivalent Na(2)O6 octahedra and  an edgeedge with one Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-72°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one Fe(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(2), two equivalent Na(1), and one Fe(1) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), two equivalent Na(1), and one Fe(1) atom. is represented by the CIF file [CIF]
data_Na2FeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.158
_cell_length_b   7.572
_cell_length_c   7.645
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   414.330
_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  0.741  0.500  0.000  1.0
  Na  Na1  1  0.259  0.500  0.000  1.0
  Na  Na2  1  0.000  0.737  0.267  1.0
  Na  Na3  1  0.500  0.237  0.233  1.0
  Na  Na4  1  0.759  0.000  0.500  1.0
  Na  Na5  1  0.241  0.000  0.500  1.0
  Na  Na6  1  0.500  0.763  0.767  1.0
  Na  Na7  1  0.000  0.263  0.733  1.0
  Fe  Fe8  1  0.000  0.221  0.148  1.0
  Fe  Fe9  1  0.500  0.721  0.352  1.0
  Fe  Fe10  1  0.500  0.279  0.648  1.0
  Fe  Fe11  1  0.000  0.779  0.852  1.0
  O  O12  1  0.811  0.203  0.023  1.0
  O  O13  1  0.189  0.203  0.023  1.0
  O  O14  1  0.500  0.568  0.194  1.0
  O  O15  1  0.000  0.431  0.215  1.0
  O  O16  1  0.500  0.931  0.285  1.0
  O  O17  1  0.000  0.068  0.306  1.0
  O  O18  1  0.689  0.703  0.477  1.0
  O  O19  1  0.311  0.703  0.477  1.0
  O  O20  1  0.689  0.297  0.523  1.0
  O  O21  1  0.311  0.297  0.523  1.0
  O  O22  1  0.000  0.932  0.694  1.0
  O  O23  1  0.500  0.069  0.715  1.0
  O  O24  1  0.000  0.569  0.785  1.0
  O  O25  1  0.500  0.432  0.806  1.0
  O  O26  1  0.811  0.797  0.977  1.0
  O  O27  1  0.189  0.797  0.977  1.0
[/CIF]
.