data_[Na4Pb2O4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Pb  2.3300  1.8000  1.1225
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [19.8051]
_cell_length_b [4.1509]
_cell_length_c [5.9159]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [Na2PbO2]
_chemical_formula_sum '[Na4 Pb2 O4]'
_cell_volume [486.3415]
_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  0.3787  0.0000  0.0223  1
  Pb  Pb1  2  0.5000  0.0000  0.4041  1
  O  O2  4  0.4140  0.0000  0.6566  1
]