data_global
_amcsd_formula_title 'Cr F7 Na2 Ni'
loop_
_publ_author_name
'Laligant Y'
'Ferey G'
'Heger G'
'Pannetier J'
_journal_name_full 'Zeitschrift fur Anorganische und Allgemeine Chemie'
_journal_volume 553 
_journal_year 1987
_journal_page_first 163
_journal_page_last 171
_publ_section_title
;
 Refinement of the crystal and frustrated magnetic structures of the
 direct weberite Na2 Ni Cr F7 by neutron powder diffraction
 _cod_database_code 1000237
;
_database_code_amcsd 0015791
_chemical_formula_sum 'Na2 F7 Ni Cr'
_cell_length_a 7.183
_cell_length_b 10.224
_cell_length_c 7.414
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 544.477
_exptl_crystal_density_diffrn      3.534
_symmetry_space_group_name_H-M 'I m m a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  'x,1/2-y,z'
  '1/2+x,-y,1/2+z'
  '-x,1/2+y,-z'
  '1/2-x,+y,1/2-z'
  '-x,y,z'
  '1/2-x,1/2+y,1/2+z'
  'x,-y,-z'
  '1/2+x,1/2-y,1/2-z'
  'x,1/2+y,-z'
  '1/2+x,+y,1/2-z'
  '-x,1/2-y,z'
  '1/2-x,-y,1/2+z'
  '-x,-y,-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
Na1   0.00000   0.00000   0.00000
Na2   0.25000   0.25000   0.75000
F1   0.00000   0.25000   0.14400
F2   0.00000   0.41200   0.72650
F3   0.19570   0.38500   0.43610
Ni1   0.25000   0.25000   0.25000
Cr1   0.00000   0.00000   0.50000