data_[Na3Ti6Sb3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ti  1.5400  1.4000  0.8517
  Sb  2.0500  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.5086]
_cell_length_b [5.5086]
_cell_length_c [13.9318]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaTi2SbO6]
_chemical_formula_sum '[Na3 Ti6 Sb3 O18]'
_cell_volume [366.1151]
_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  0.2765  1.0
  Ti  Ti1  3  0.0000  0.0000  0.0209  1.0
  Ti  Ti2  3  0.0000  0.0000  0.5073  1.0
  Sb  Sb3  3  0.0000  0.0000  0.8005  1.0
  O  O4  9  0.1091  0.3352  0.0820  1.0
  O  O5  9  0.1164  0.7658  0.5716  1.0
]