data_[Pb3Se3]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pb  2.3300  1.8000  1.1225
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P3_1]
_cell_length_a [17.4543]
_cell_length_b [17.4543]
_cell_length_c [4.0670]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [144]
_chemical_formula_structural [PbSe]
_chemical_formula_sum '[Pb3 Se3]'
_cell_volume [1073.0133]
_cell_formula_units_Z [3]
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
[
  Pb  Pb0  3  0.5111  0.2956  0.1071  1
  Se  Se1  3  0.5811  0.1819  0.9543  1
]