data_[K4Nb4Bi4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Nb  1.6000  1.4500  0.8200
  Bi  2.0200  1.6000  1.0350
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [6.5467]
_cell_length_b [10.2673]
_cell_length_c [7.8214]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [KNbBiO4]
_chemical_formula_sum '[K4 Nb4 Bi4 O16]'
_cell_volume [525.7319]
_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  0.5000  0.0000  1
  Nb  Nb1  4  0.0000  0.1279  0.7500  1
  Bi  Bi2  4  0.0000  0.1934  0.2500  1
  O  O3  8  0.0000  0.2262  0.5486  1
  O  O4  8  0.2026  0.0101  0.2500  1
]