data_[Na2Nb2Pb2O8]
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
  Pb  2.3300  1.8000  1.1225
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.5701]
_cell_length_b [6.2763]
_cell_length_c [6.8437]
_cell_angle_alpha [90.0000]
_cell_angle_beta [99.2551]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaNbPbO4]
_chemical_formula_sum '[Na2 Nb2 Pb2 O8]'
_cell_volume [278.5315]
_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  0.1545  0.7500  0.5905  1.0
  Nb  Nb1  2  0.3237  0.2500  0.3696  1.0
  Pb  Pb2  2  0.2732  0.7500  0.1231  1.0
  O  O3  4  0.1451  0.0101  0.3212  1.0
  O  O4  2  0.4553  0.2500  0.6341  1.0
  O  O5  2  0.4856  0.7500  0.7999  1.0
]