data_[Na2Nb2Bi4O12]
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
  Bi  2.0200  1.6000  1.0350
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [5.6637]
_cell_length_b [6.1043]
_cell_length_c [9.8548]
_cell_angle_alpha [90.0000]
_cell_angle_beta [123.1440]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [NaNb(BiO3)2]
_chemical_formula_sum '[Na2 Nb2 Bi4 O12]'
_cell_volume [285.2757]
_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  2  0.0000  0.0000  0.5000  1
  Nb  Nb1  2  0.5000  0.0000  0.0000  1
  Bi  Bi2  4  0.2292  0.0424  0.2420  1
  O  O3  4  0.1435  0.1584  0.9468  1
  O  O4  4  0.2795  0.7167  0.9205  1
  O  O5  4  0.4158  0.0673  0.7746  1
]