data_[Na4Nb4O12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  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/c]
_cell_length_a [6.8219]
_cell_length_b [5.3841]
_cell_length_c [7.2238]
_cell_angle_alpha [90.0000]
_cell_angle_beta [95.0040]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [NaNbO3]
_chemical_formula_sum '[Na4 Nb4 O12]'
_cell_volume [264.3168]
_cell_formula_units_Z [4]
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  0.3923  0.2473  0.3251  1.0
  Nb  Nb1  4  0.1178  0.7322  0.4253  1.0
  O  O2  4  0.0574  0.5777  0.1652  1.0
  O  O3  4  0.1847  0.0699  0.0447  1.0
  O  O4  4  0.3684  0.6717  0.8894  1.0
]