The structure described by Na5CrO4 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form NaO4 tetrahedra that share corners with four equivalent Cr(1)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. Cr(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form CrO4 tetrahedra that share corners with four equivalent Na(1)O4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), four equivalent Na(2), and one Cr(1) atom to form a mixture of corner and edge-sharing ONa5Cr octahedra. The corner-sharing octahedral tilt angles range from 58-59°. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Na(1), four equivalent Na(2), and one Cr(1) atom. is represented by the CIF file [CIF]
data_Na5CrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.379
_cell_length_b   7.275
_cell_length_c   7.634
_cell_angle_alpha   89.952
_cell_angle_beta   90.001
_cell_angle_gamma   89.999
_symmetry_Int_Tables_number   1
_cell_volume   298.708
_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
  Cr  Cr0  1  0.783  0.750  0.750  1.0
  Cr  Cr1  1  0.216  0.250  0.250  1.0
  Na  Na2  1  0.819  0.250  0.750  1.0
  Na  Na3  1  0.181  0.750  0.250  1.0
  Na  Na4  1  0.257  0.989  0.943  1.0
  Na  Na5  1  0.257  0.511  0.943  1.0
  Na  Na6  1  0.257  0.511  0.557  1.0
  Na  Na7  1  0.257  0.989  0.557  1.0
  Na  Na8  1  0.743  0.489  0.443  1.0
  Na  Na9  1  0.743  0.011  0.443  1.0
  Na  Na10  1  0.743  0.489  0.057  1.0
  Na  Na11  1  0.743  0.011  0.057  1.0
  O  O12  1  0.963  0.750  0.977  1.0
  O  O13  1  0.963  0.750  0.523  1.0
  O  O14  1  0.037  0.250  0.477  1.0
  O  O15  1  0.037  0.250  0.023  1.0
  O  O16  1  0.599  0.526  0.750  1.0
  O  O17  1  0.599  0.974  0.750  1.0
  O  O18  1  0.401  0.474  0.250  1.0
  O  O19  1  0.401  0.026  0.250  1.0
[/CIF]
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The structure described by Na5CrO4 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form NaO4 tetrahedra that share corners with four equivalent Cr(1)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. Cr(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form CrO4 tetrahedra that share corners with four equivalent Na(1)O4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), four equivalent Na(2), and one Cr(1) atom to form a mixture of corner and edge-sharing ONa5Cr octahedra. The corner-sharing octahedral tilt angles range from 58-59°. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Na(1), four equivalent Na(2), and one Cr(1) atom. is represented by the CIF file [CIF]
data_Na5CrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.379
_cell_length_b   7.275
_cell_length_c   7.634
_cell_angle_alpha   89.952
_cell_angle_beta   90.001
_cell_angle_gamma   89.999
_symmetry_Int_Tables_number   1
_cell_volume   298.708
_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
  Cr  Cr0  1  0.783  0.750  0.750  1.0
  Cr  Cr1  1  0.216  0.250  0.250  1.0
  Na  Na2  1  0.819  0.250  0.750  1.0
  Na  Na3  1  0.181  0.750  0.250  1.0
  Na  Na4  1  0.257  0.989  0.943  1.0
  Na  Na5  1  0.257  0.511  0.943  1.0
  Na  Na6  1  0.257  0.511  0.557  1.0
  Na  Na7  1  0.257  0.989  0.557  1.0
  Na  Na8  1  0.743  0.489  0.443  1.0
  Na  Na9  1  0.743  0.011  0.443  1.0
  Na  Na10  1  0.743  0.489  0.057  1.0
  Na  Na11  1  0.743  0.011  0.057  1.0
  O  O12  1  0.963  0.750  0.977  1.0
  O  O13  1  0.963  0.750  0.523  1.0
  O  O14  1  0.037  0.250  0.477  1.0
  O  O15  1  0.037  0.250  0.023  1.0
  O  O16  1  0.599  0.526  0.750  1.0
  O  O17  1  0.599  0.974  0.750  1.0
  O  O18  1  0.401  0.474  0.250  1.0
  O  O19  1  0.401  0.026  0.250  1.0
[/CIF]
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