The structure described by Na2FeO4 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded to one O(4), two equivalent O(1), and two equivalent O(3) atoms to form distorted NaO5 square pyramids that share corners with three equivalent Fe(1)O4 tetrahedra, edges with two equivalent Na(2)O5 square pyramids, and  an edgeedge with one Fe(1)O4 tetrahedra. Fe(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form FeO4 tetrahedra that share corners with three equivalent Na(2)O5 square pyramids and  an edgeedge with one Na(2)O5 square pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like 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 distorted trigonal non-coplanar geometry to two equivalent Na(1) and one Fe(1) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Na(1), two equivalent Na(2), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Na(1), one Na(2), and one Fe(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2FeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.574
_cell_length_b   5.703
_cell_length_c   8.677
_cell_angle_alpha   96.819
_cell_angle_beta   71.716
_cell_angle_gamma   113.161
_symmetry_Int_Tables_number   1
_cell_volume   240.807
_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  0.611  0.264  0.644  1.0
  Na  Na1  1  0.389  0.736  0.356  1.0
  Na  Na2  1  0.777  0.763  0.929  1.0
  Na  Na3  1  0.223  0.237  0.071  1.0
  Fe  Fe4  1  0.302  0.691  0.753  1.0
  Fe  Fe5  1  0.698  0.309  0.247  1.0
  O  O6  1  0.608  0.490  0.156  1.0
  O  O7  1  0.392  0.510  0.844  1.0
  O  O8  1  0.452  0.188  0.415  1.0
  O  O9  1  0.548  0.812  0.585  1.0
  O  O10  1  0.731  0.063  0.130  1.0
  O  O11  1  0.269  0.937  0.871  1.0
  O  O12  1  0.993  0.469  0.285  1.0
  O  O13  1  0.007  0.531  0.715  1.0
[/CIF]
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The structure described by Na2FeO4 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. In the second Na site, Na(2) is bonded to one O(4), two equivalent O(1), and two equivalent O(3) atoms to form distorted NaO5 square pyramids that share corners with three equivalent Fe(1)O4 tetrahedra, edges with two equivalent Na(2)O5 square pyramids, and  an edgeedge with one Fe(1)O4 tetrahedra. Fe(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form FeO4 tetrahedra that share corners with three equivalent Na(2)O5 square pyramids and  an edgeedge with one Na(2)O5 square pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like 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 distorted trigonal non-coplanar geometry to two equivalent Na(1) and one Fe(1) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Na(1), two equivalent Na(2), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Na(1), one Na(2), and one Fe(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2FeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.574
_cell_length_b   5.703
_cell_length_c   8.677
_cell_angle_alpha   96.819
_cell_angle_beta   71.716
_cell_angle_gamma   113.161
_symmetry_Int_Tables_number   1
_cell_volume   240.807
_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  0.611  0.264  0.644  1.0
  Na  Na1  1  0.389  0.736  0.356  1.0
  Na  Na2  1  0.777  0.763  0.929  1.0
  Na  Na3  1  0.223  0.237  0.071  1.0
  Fe  Fe4  1  0.302  0.691  0.753  1.0
  Fe  Fe5  1  0.698  0.309  0.247  1.0
  O  O6  1  0.608  0.490  0.156  1.0
  O  O7  1  0.392  0.510  0.844  1.0
  O  O8  1  0.452  0.188  0.415  1.0
  O  O9  1  0.548  0.812  0.585  1.0
  O  O10  1  0.731  0.063  0.130  1.0
  O  O11  1  0.269  0.937  0.871  1.0
  O  O12  1  0.993  0.469  0.285  1.0
  O  O13  1  0.007  0.531  0.715  1.0
[/CIF]
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