data_[Na6Ta4O10F4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ta  1.5000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [3.9915]
_cell_length_b [3.9915]
_cell_length_c [19.9436]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Na3Ta2O5F2]
_chemical_formula_sum '[Na6 Ta4 O10 F4]'
_cell_volume [317.7438]
_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
[
  Na  Na0  4  0.0000  0.0000  0.1837  1.0
  Na  Na1  2  0.0000  0.0000  0.0000  1.0
  Ta  Ta2  4  0.0000  0.0000  0.4020  1.0
  O  O3  8  0.0000  0.5000  0.1026  1.0
  O  O4  2  0.0000  0.0000  0.5000  1.0
  F  F5  4  0.0000  0.0000  0.2957  1.0
]