data_global
_amcsd_formula_title 'Na2W2O7'
loop_
_publ_author_name
'Range K J'
'Haase H'
_journal_name_full 'Acta Crystallographica, Section C'
_journal_volume 46 
_journal_year 1990
_journal_page_first 317
_journal_page_last 318
_publ_section_title
;
 Na2W2O7(II), a high-pressure phase of disodium ditungstate(VI)
;
_database_code_amcsd 0010100
_chemical_formula_sum 'W2 Na2 O7'
_cell_length_a 3.7777
_cell_length_b 26.6067
_cell_length_c 5.4290
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 545.680
_exptl_crystal_density_diffrn      6.399
_symmetry_space_group_name_H-M 'C m c 21'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,z'
  '1/2-x,1/2+y,z'
  '-x,-y,1/2+z'
  '1/2-x,1/2-y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
W1   0.00000   0.44470   0.10218   0.00405
W2   0.00000   0.34024   0.57450   0.00545
Na1   0.50000   0.55080   0.10470   0.01646
Na2   0.50000   0.28740   0.05230   0.03166
O1   0.00000   0.39360   0.90470   0.03673
O2   0.00000   0.50760   0.34570   0.02406
O3   0.00000   0.40840   0.39420   0.01520
O4   0.50000   0.35170   0.62400   0.02406
O5   0.00000   0.29100   0.78470   0.01773
O6   0.50000   0.45250   0.14830   0.02153
O7   0.00000   0.30590   0.30620   0.02913