data_global
_amcsd_formula_title 'Cr Na2 O4'
loop_
_publ_author_name
'Miller J'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 94 
_journal_year 1936
_journal_page_first 131
_journal_page_last 136
_publ_section_title
;
 The crystal structure of anhydrous sodium chromate, Na2 Cr O4
 _cod_database_code 1010023
;
_database_code_amcsd 0016962
_chemical_formula_sum 'Na2 Cr O4'
_cell_length_a 5.91
_cell_length_b 9.23
_cell_length_c 7.2
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 392.755
_exptl_crystal_density_diffrn      2.739
_symmetry_space_group_name_H-M 'P b n n'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2-z'
  '1/2-x,1/2-y,1/2+z'
  '1/2+x,-y,1/2+z'
  '1/2-x,y,1/2-z'
  '-x,1/2+y,z'
  'x,1/2-y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Na1   0.25000   0.45000   0.25000
Na2  -0.25000   0.25000   0.00000
Cr1   0.25000   0.09720   0.25000
O1   0.02780   0.20000   0.25000
O2   0.25000   0.00000   0.06940