data_[K6Ce3Nb9O36]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Ce  1.1200  1.8500  1.0800
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [7.7053]
_cell_length_b [7.7053]
_cell_length_c [18.5779]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [K2CeNb3O12]
_chemical_formula_sum '[K6 Ce3 Nb9 O36]'
_cell_volume [955.2315]
_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
[
  K  K0  6  0.0000  0.0000  0.3536  1
  Ce  Ce1  3  0.0000  0.0000  0.0000  1
  Nb  Nb2  9  0.0000  0.5000  0.5000  1
  O  O3  18  0.0419  0.5210  0.6063  1
  O  O4  18  0.0900  0.5450  0.8438  1
]