data_[Er4Nb4O16]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [I4_1/a]
_cell_length_a [5.2220]
_cell_length_b [5.2220]
_cell_length_c [11.0345]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [88]
_chemical_formula_structural [ErNbO4]
_chemical_formula_sum '[Er4 Nb4 O16]'
_cell_volume [300.9000]
_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  4  0.0000  0.0000  0.0000  1.0
  Nb  Nb1  4  0.0000  0.0000  0.5000  1.0
  O  O2  16  0.1795  0.2461  0.8403  1.0
]