data_[Na2Nb4Sb2O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Nb  1.6000  1.4500  0.8200
  Sb  2.0500  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [7.0266]
_cell_length_b [6.6340]
_cell_length_c [6.4679]
_cell_angle_alpha [90.0000]
_cell_angle_beta [91.3516]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [NaNb2SbO8]
_chemical_formula_sum '[Na2 Nb4 Sb2 O16]'
_cell_volume [301.4140]
_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  0.5000  1.0
  Nb  Nb1  4  0.0306  0.5000  0.7418  1.0
  Sb  Sb2  2  0.0000  0.0000  0.0000  1.0
  O  O3  8  0.0041  0.2085  0.2203  1.0
  O  O4  4  0.1783  0.5000  0.5044  1.0
  O  O5  4  0.2054  0.5000  0.9913  1.0
]