data_[Pm2Y2Se4O2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Y  1.2200  1.8000  1.0400
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P4/nmm]
_cell_length_a [4.0382]
_cell_length_b [4.0382]
_cell_length_c [14.5942]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [129]
_chemical_formula_structural [PmYSe2O]
_chemical_formula_sum '[Pm2 Y2 Se4 O2]'
_cell_volume [237.9828]
_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
[
  Pm  Pm0  2  0.0000  0.5000  0.4200  1
  Y  Y1  2  0.0000  0.5000  0.8749  1
  Se  Se2  2  0.0000  0.5000  0.0886  1
  Se  Se3  2  0.0000  0.5000  0.6946  1
  O  O4  2  0.0000  0.0000  0.5000  1
]