data_[Na3Dy6Nb3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Dy  1.2200  1.7500  1.1310
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.6907]
_cell_length_b [5.6907]
_cell_length_c [15.0975]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaDy2NbO6]
_chemical_formula_sum '[Na3 Dy6 Nb3 O18]'
_cell_volume [423.4121]
_cell_formula_units_Z [3]
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
[
  Na  Na0  3  0.0000  0.0000  0.2019  1.0
  Dy  Dy1  3  0.0000  0.0000  0.4772  1.0
  Dy  Dy2  3  0.0000  0.0000  0.9787  1.0
  Nb  Nb3  3  0.0000  0.0000  0.6832  1.0
  O  O4  9  0.0124  0.3719  0.4104  1.0
  O  O5  9  0.0201  0.7390  0.5888  1.0
]