data_[K4Ce4Nb4O20]
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 [C2/c]
_cell_length_a [7.7661]
_cell_length_b [10.2635]
_cell_length_c [8.1259]
_cell_angle_alpha [90.0000]
_cell_angle_beta [113.9192]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [KCeNbO5]
_chemical_formula_sum '[K4 Ce4 Nb4 O20]'
_cell_volume [592.0639]
_cell_formula_units_Z [4]
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  4  0.0000  0.3257  0.2500  1.0
  Ce  Ce1  4  0.0000  0.0000  0.0000  1.0
  Nb  Nb2  4  0.0000  0.3170  0.7500  1.0
  O  O3  8  0.0915  0.2109  0.6131  1.0
  O  O4  8  0.1889  0.4277  0.9031  1.0
  O  O5  4  0.0000  0.0621  0.2500  1.0
]