data_[Pm6Er2N8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Er  1.2400  1.7500  1.0300
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [P2/c]
_cell_length_a [6.1815]
_cell_length_b [7.1441]
_cell_length_c [6.1800]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.4566]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [13]
_chemical_formula_structural [Pm3ErN4]
_chemical_formula_sum '[Pm6 Er2 N8]'
_cell_volume [257.3306]
_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  0.3722  0.7500  1
  Pm  Pm1  2  0.5000  0.1241  0.7500  1
  Pm  Pm2  2  0.5000  0.3718  0.2500  1
  Er  Er3  2  0.0000  0.1243  0.2500  1
  N  N4  4  0.2416  0.1231  0.0017  1
  N  N5  4  0.2470  0.3671  0.4946  1
]