The crystal structure described by Na3CrO4 crystallizes in the cubic P2_13 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted T-shaped geometry to three equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a distorted rectangular see-saw-like geometry to one O(1) and three equivalent O(2) atoms. In the third Na site, Na(3) is bonded in a trigonal planar geometry to three equivalent O(2) atoms. Cr(1) is bonded in a tetrahedral geometry to one O(1) and three equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Na(2) and one Cr(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), and one Cr(1) atom. is represented by the CIF file [CIF]
data_Na3CrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.909
_cell_length_b   7.909
_cell_length_c   7.909
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   494.736
_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  0.005  0.005  0.005  1.0
  Na  Na1  1  0.495  0.995  0.505  1.0
  Na  Na2  1  0.995  0.505  0.495  1.0
  Na  Na3  1  0.505  0.495  0.995  1.0
  Na  Na4  1  0.215  0.215  0.215  1.0
  Na  Na5  1  0.285  0.785  0.715  1.0
  Na  Na6  1  0.785  0.715  0.285  1.0
  Na  Na7  1  0.715  0.285  0.785  1.0
  Na  Na8  1  0.742  0.742  0.742  1.0
  Na  Na9  1  0.758  0.258  0.242  1.0
  Na  Na10  1  0.258  0.242  0.758  1.0
  Na  Na11  1  0.242  0.758  0.258  1.0
  Cr  Cr12  1  0.498  0.498  0.498  1.0
  Cr  Cr13  1  0.002  0.502  0.998  1.0
  Cr  Cr14  1  0.502  0.998  0.002  1.0
  Cr  Cr15  1  0.998  0.002  0.502  1.0
  O  O16  1  0.373  0.373  0.373  1.0
  O  O17  1  0.127  0.627  0.873  1.0
  O  O18  1  0.627  0.873  0.127  1.0
  O  O19  1  0.873  0.127  0.627  1.0
  O  O20  1  0.971  0.058  0.291  1.0
  O  O21  1  0.529  0.942  0.791  1.0
  O  O22  1  0.029  0.558  0.209  1.0
  O  O23  1  0.291  0.971  0.058  1.0
  O  O24  1  0.471  0.442  0.709  1.0
  O  O25  1  0.791  0.529  0.942  1.0
  O  O26  1  0.209  0.029  0.558  1.0
  O  O27  1  0.709  0.471  0.442  1.0
  O  O28  1  0.058  0.291  0.971  1.0
  O  O29  1  0.558  0.209  0.029  1.0
  O  O30  1  0.442  0.709  0.471  1.0
  O  O31  1  0.942  0.791  0.529  1.0
[/CIF]
.
The crystal structure described by Na3CrO4 crystallizes in the cubic P2_13 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted T-shaped geometry to three equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a distorted rectangular see-saw-like geometry to one O(1) and three equivalent O(2) atoms. In the third Na site, Na(3) is bonded in a trigonal planar geometry to three equivalent O(2) atoms. Cr(1) is bonded in a tetrahedral geometry to one O(1) and three equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Na(2) and one Cr(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), and one Cr(1) atom. is represented by the CIF file [CIF]
data_Na3CrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.909
_cell_length_b   7.909
_cell_length_c   7.909
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   494.736
_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  0.005  0.005  0.005  1.0
  Na  Na1  1  0.495  0.995  0.505  1.0
  Na  Na2  1  0.995  0.505  0.495  1.0
  Na  Na3  1  0.505  0.495  0.995  1.0
  Na  Na4  1  0.215  0.215  0.215  1.0
  Na  Na5  1  0.285  0.785  0.715  1.0
  Na  Na6  1  0.785  0.715  0.285  1.0
  Na  Na7  1  0.715  0.285  0.785  1.0
  Na  Na8  1  0.742  0.742  0.742  1.0
  Na  Na9  1  0.758  0.258  0.242  1.0
  Na  Na10  1  0.258  0.242  0.758  1.0
  Na  Na11  1  0.242  0.758  0.258  1.0
  Cr  Cr12  1  0.498  0.498  0.498  1.0
  Cr  Cr13  1  0.002  0.502  0.998  1.0
  Cr  Cr14  1  0.502  0.998  0.002  1.0
  Cr  Cr15  1  0.998  0.002  0.502  1.0
  O  O16  1  0.373  0.373  0.373  1.0
  O  O17  1  0.127  0.627  0.873  1.0
  O  O18  1  0.627  0.873  0.127  1.0
  O  O19  1  0.873  0.127  0.627  1.0
  O  O20  1  0.971  0.058  0.291  1.0
  O  O21  1  0.529  0.942  0.791  1.0
  O  O22  1  0.029  0.558  0.209  1.0
  O  O23  1  0.291  0.971  0.058  1.0
  O  O24  1  0.471  0.442  0.709  1.0
  O  O25  1  0.791  0.529  0.942  1.0
  O  O26  1  0.209  0.029  0.558  1.0
  O  O27  1  0.709  0.471  0.442  1.0
  O  O28  1  0.058  0.291  0.971  1.0
  O  O29  1  0.558  0.209  0.029  1.0
  O  O30  1  0.442  0.709  0.471  1.0
  O  O31  1  0.942  0.791  0.529  1.0
[/CIF]
.