data_[Na4Tl2Pb2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Tl  1.6200  1.9000  1.3325
  Pb  2.3300  1.8000  1.1225
]
_symmetry_space_group_name_H-M [Imm2]
_cell_length_a [5.4829]
_cell_length_b [5.5047]
_cell_length_c [7.6772]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [44]
_chemical_formula_structural [Na2TlPb]
_chemical_formula_sum '[Na4 Tl2 Pb2]'
_cell_volume [231.7106]
_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  0.8105  1.0
  Na  Na1  2  0.0000  0.5000  0.0635  1.0
  Tl  Tl2  2  0.0000  0.0000  0.3163  1.0
  Pb  Pb3  2  0.0000  0.5000  0.5597  1.0
]