data_[Na3Sc6Nb3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sc  1.3600  1.6000  0.8850
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.4402]
_cell_length_b [5.4402]
_cell_length_c [14.6574]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaSc2NbO6]
_chemical_formula_sum '[Na3 Sc6 Nb3 O18]'
_cell_volume [375.6810]
_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  0.2040  1.0
  Sc  Sc1  3  0.0000  0.0000  0.4831  1.0
  Sc  Sc2  3  0.0000  0.0000  0.9812  1.0
  Nb  Nb3  3  0.0000  0.0000  0.6858  1.0
  O  O4  9  0.0011  0.3450  0.4093  1.0
  O  O5  9  0.0333  0.6153  0.2521  1.0
]