data_[Pm4Ta4N8O4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Ta  1.5000  1.4500  0.8200
  N  3.0400  0.6500  0.6300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [5.6945]
_cell_length_b [7.8573]
_cell_length_c [5.7016]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [PmTaN2O]
_chemical_formula_sum '[Pm4 Ta4 N8 O4]'
_cell_volume [255.1082]
_cell_formula_units_Z [4]
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  4  0.0000  0.2500  0.9789  1
  Ta  Ta1  4  0.0000  0.0000  0.5000  1
  N  N2  8  0.2500  0.0552  0.7500  1
  O  O3  4  0.0000  0.2500  0.3986  1
]