data_[Na2Nd2Nb8O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Nd  1.1400  1.8500  1.2765
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [5.6206]
_cell_length_b [5.6206]
_cell_length_c [16.0430]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [NaNdNb4O12]
_chemical_formula_sum '[Na2 Nd2 Nb8 O24]'
_cell_volume [506.8203]
_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
[
  Na  Na0  2  0.0000  0.0000  0.0000  1.0
  Nd  Nd1  2  0.0000  0.0000  0.5000  1.0
  Nb  Nb2  8  0.0000  0.5000  0.1290  1.0
  O  O3  16  0.2418  0.2418  0.3860  1.0
  O  O4  4  0.0000  0.5000  0.0000  1.0
  O  O5  4  0.0000  0.5000  0.2500  1.0
]