data_[Ce4Pm2Se4N4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ce  1.1200  1.8500  1.0800
  Pm  1.1300  1.8500  1.1100
  Se  2.5500  1.1500  1.0133
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [13.2749]
_cell_length_b [3.9914]
_cell_length_c [7.0309]
_cell_angle_alpha [90.0000]
_cell_angle_beta [121.4815]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Ce2Pm(SeN)2]
_chemical_formula_sum '[Ce4 Pm2 Se4 N4]'
_cell_volume [317.7015]
_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
[
  Ce  Ce0  4  0.2115  0.0000  0.7610  1
  Pm  Pm1  2  0.0000  0.0000  0.0000  1
  Se  Se2  4  0.0856  0.5000  0.3561  1
  N  N3  4  0.1971  0.0000  0.0669  1
]