data_[Pm2Nb2O2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P-6m2]
_cell_length_a [3.1882]
_cell_length_b [3.1882]
_cell_length_c [11.7828]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [187]
_chemical_formula_structural [PmNbO]
_chemical_formula_sum '[Pm2 Nb2 O2]'
_cell_volume [103.7208]
_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  0.3333  0.6667  0.8578  1
  Nb  Nb1  2  0.0000  0.0000  0.3780  1
  O  O2  1  0.0000  0.0000  0.0000  1
  O  O3  1  0.3333  0.6667  0.5000  1
]