The structure described by Na6CoO4 crystallizes in the cubic I-43m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(3) and three equivalent O(1) atoms to form NaO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra, corners with nine equivalent Na(1)O4 tetrahedra, and  an edgeedge with one Co(1)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(3) and three equivalent O(1) atoms. Co(1) is bonded to one O(2) and three equivalent O(1) atoms to form CoO4 tetrahedra that share corners with three equivalent Na(1)O4 tetrahedra, corners with three equivalent Co(1)O4 tetrahedra, and edges with three equivalent Na(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), three equivalent Na(2), and one Co(1) atom. In the second O site, O(2) is bonded in a tetrahedral geometry to four equivalent Co(1) atoms. In the third O site, O(3) is bonded in a 8-coordinate geometry to four equivalent Na(1) and four equivalent Na(2) atoms. is represented by the CIF file [CIF]
data_Na6CoO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.324
_cell_length_b   9.324
_cell_length_c   9.324
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   624.101
_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  0.733  0.462  0.000  1.0
  Na  Na1  1  0.733  0.000  0.462  1.0
  Na  Na2  1  0.431  0.216  0.000  1.0
  Na  Na3  1  0.431  0.000  0.216  1.0
  Na  Na4  1  0.729  0.267  0.267  1.0
  Na  Na5  1  0.784  0.784  0.215  1.0
  Na  Na6  1  0.784  0.215  0.784  1.0
  Na  Na7  1  0.216  0.431  0.000  1.0
  Na  Na8  1  0.216  0.000  0.431  1.0
  Na  Na9  1  0.538  0.271  0.538  1.0
  Na  Na10  1  0.538  0.538  0.271  1.0
  Na  Na11  1  0.462  0.733  0.000  1.0
  Na  Na12  1  0.462  0.000  0.733  1.0
  Na  Na13  1  0.785  0.569  0.569  1.0
  Na  Na14  1  0.000  0.431  0.216  1.0
  Na  Na15  1  0.000  0.216  0.431  1.0
  Na  Na16  1  0.267  0.729  0.267  1.0
  Na  Na17  1  0.267  0.267  0.729  1.0
  Na  Na18  1  0.569  0.785  0.569  1.0
  Na  Na19  1  0.569  0.569  0.785  1.0
  Na  Na20  1  0.271  0.538  0.538  1.0
  Na  Na21  1  0.000  0.733  0.462  1.0
  Na  Na22  1  0.000  0.462  0.733  1.0
  Na  Na23  1  0.215  0.784  0.784  1.0
  Co  Co24  1  0.747  0.000  0.000  1.0
  Co  Co25  1  0.253  0.253  0.253  1.0
  Co  Co26  1  0.000  0.747  0.000  1.0
  Co  Co27  1  0.000  0.000  0.747  1.0
  O  O28  1  0.722  0.210  0.000  1.0
  O  O29  1  0.722  0.000  0.210  1.0
  O  O30  1  0.000  0.000  0.000  1.0
  O  O31  1  0.500  0.500  0.000  1.0
  O  O32  1  0.500  0.000  0.500  1.0
  O  O33  1  0.488  0.278  0.278  1.0
  O  O34  1  0.790  0.512  0.790  1.0
  O  O35  1  0.790  0.790  0.512  1.0
  O  O36  1  0.210  0.722  0.000  1.0
  O  O37  1  0.210  0.000  0.722  1.0
  O  O38  1  0.278  0.488  0.278  1.0
  O  O39  1  0.278  0.278  0.488  1.0
  O  O40  1  0.000  0.722  0.210  1.0
  O  O41  1  0.000  0.210  0.722  1.0
  O  O42  1  0.000  0.500  0.500  1.0
  O  O43  1  0.512  0.790  0.790  1.0
[/CIF]
.
The structure described by Na6CoO4 crystallizes in the cubic I-43m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(3) and three equivalent O(1) atoms to form NaO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra, corners with nine equivalent Na(1)O4 tetrahedra, and  an edgeedge with one Co(1)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(3) and three equivalent O(1) atoms. Co(1) is bonded to one O(2) and three equivalent O(1) atoms to form CoO4 tetrahedra that share corners with three equivalent Na(1)O4 tetrahedra, corners with three equivalent Co(1)O4 tetrahedra, and edges with three equivalent Na(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), three equivalent Na(2), and one Co(1) atom. In the second O site, O(2) is bonded in a tetrahedral geometry to four equivalent Co(1) atoms. In the third O site, O(3) is bonded in a 8-coordinate geometry to four equivalent Na(1) and four equivalent Na(2) atoms. is represented by the CIF file [CIF]
data_Na6CoO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.324
_cell_length_b   9.324
_cell_length_c   9.324
_cell_angle_alpha   109.471
_cell_angle_beta   109.471
_cell_angle_gamma   109.471
_symmetry_Int_Tables_number   1
_cell_volume   624.101
_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  0.733  0.462  0.000  1.0
  Na  Na1  1  0.733  0.000  0.462  1.0
  Na  Na2  1  0.431  0.216  0.000  1.0
  Na  Na3  1  0.431  0.000  0.216  1.0
  Na  Na4  1  0.729  0.267  0.267  1.0
  Na  Na5  1  0.784  0.784  0.215  1.0
  Na  Na6  1  0.784  0.215  0.784  1.0
  Na  Na7  1  0.216  0.431  0.000  1.0
  Na  Na8  1  0.216  0.000  0.431  1.0
  Na  Na9  1  0.538  0.271  0.538  1.0
  Na  Na10  1  0.538  0.538  0.271  1.0
  Na  Na11  1  0.462  0.733  0.000  1.0
  Na  Na12  1  0.462  0.000  0.733  1.0
  Na  Na13  1  0.785  0.569  0.569  1.0
  Na  Na14  1  0.000  0.431  0.216  1.0
  Na  Na15  1  0.000  0.216  0.431  1.0
  Na  Na16  1  0.267  0.729  0.267  1.0
  Na  Na17  1  0.267  0.267  0.729  1.0
  Na  Na18  1  0.569  0.785  0.569  1.0
  Na  Na19  1  0.569  0.569  0.785  1.0
  Na  Na20  1  0.271  0.538  0.538  1.0
  Na  Na21  1  0.000  0.733  0.462  1.0
  Na  Na22  1  0.000  0.462  0.733  1.0
  Na  Na23  1  0.215  0.784  0.784  1.0
  Co  Co24  1  0.747  0.000  0.000  1.0
  Co  Co25  1  0.253  0.253  0.253  1.0
  Co  Co26  1  0.000  0.747  0.000  1.0
  Co  Co27  1  0.000  0.000  0.747  1.0
  O  O28  1  0.722  0.210  0.000  1.0
  O  O29  1  0.722  0.000  0.210  1.0
  O  O30  1  0.000  0.000  0.000  1.0
  O  O31  1  0.500  0.500  0.000  1.0
  O  O32  1  0.500  0.000  0.500  1.0
  O  O33  1  0.488  0.278  0.278  1.0
  O  O34  1  0.790  0.512  0.790  1.0
  O  O35  1  0.790  0.790  0.512  1.0
  O  O36  1  0.210  0.722  0.000  1.0
  O  O37  1  0.210  0.000  0.722  1.0
  O  O38  1  0.278  0.488  0.278  1.0
  O  O39  1  0.278  0.278  0.488  1.0
  O  O40  1  0.000  0.722  0.210  1.0
  O  O41  1  0.000  0.210  0.722  1.0
  O  O42  1  0.000  0.500  0.500  1.0
  O  O43  1  0.512  0.790  0.790  1.0
[/CIF]
.