data_[Er4Nb4N8O4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Er  1.2400  1.7500  1.0300
  Nb  1.6000  1.4500  0.8200
  N  3.0400  0.6500  0.6300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pmc2_1]
_cell_length_a [7.7869]
_cell_length_b [5.4807]
_cell_length_c [5.7525]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [26]
_chemical_formula_structural [ErNbN2O]
_chemical_formula_sum '[Er4 Nb4 N8 O4]'
_cell_volume [245.5012]
_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
[
  Er  Er0  2  0.0000  0.2512  0.0672  1
  Er  Er1  2  0.5000  0.2565  0.9416  1
  Nb  Nb2  4  0.2430  0.2329  0.5183  1
  N  N3  4  0.1949  0.0630  0.8115  1
  N  N4  2  0.0000  0.3644  0.4495  1
  N  N5  2  0.5000  0.1498  0.5301  1
  O  O6  4  0.3062  0.4356  0.1762  1
]