data_[Ba2Na2Nb2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ba  0.8900  2.1500  1.4900
  Na  0.9300  1.8000  1.1600
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.3223]
_cell_length_b [6.3227]
_cell_length_c [7.2234]
_cell_angle_alpha [90.0000]
_cell_angle_beta [110.0175]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [BaNaNbO4]
_chemical_formula_sum '[Ba2 Na2 Nb2 O8]'
_cell_volume [271.3028]
_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
[
  Ba  Ba0  2  0.2633  0.2500  0.0393  1.0
  Na  Na1  2  0.1682  0.2500  0.4922  1.0
  Nb  Nb2  2  0.2883  0.7500  0.3307  1.0
  O  O3  4  0.0862  0.5194  0.2531  1.0
  O  O4  2  0.4498  0.7500  0.5988  1.0
  O  O5  2  0.4875  0.7500  0.1874  1.0
]