data_KNbO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.74
_cell_length_b   6.74
_cell_length_c   6.74
_cell_angle_alpha   48.61
_cell_angle_beta   48.61
_cell_angle_gamma   48.61
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KNbO3
_chemical_formula_sum   'K2 Nb2 O6'
_cell_volume   157.94
_cell_formula_units_Z   2
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  1  0.0  0.0  0.46  1.0
  K  K1  1  0.0  0.0  0.32  1.0
  Nb  Nb2  1  0.0  0.0  0.16  1.0
  Nb  Nb3  1  0.0  0.0  0.62  1.0
  O  O4  1  0.8  0.81  0.1  1.0
  O  O5  1  0.63  0.56  0.1  1.0
  O  O6  1  0.57  0.63  0.1  1.0
  O  O7  1  0.43  0.37  0.68  1.0
  O  O8  1  0.37  0.44  0.68  1.0
  O  O9  1  0.2  0.19  0.68  1.0

data_KNbO3
_symmetry_space_group_name_H-M   P-1
_cell_length_a   5.55
_cell_length_b   5.55
_cell_length_c   6.74
_cell_angle_alpha   65.7
_cell_angle_beta   65.7
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   KNbO3
_chemical_formula_sum   'K2 Nb2 O6'
_cell_volume   157.94
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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  2  0.0  0.43  0.07  1.0
  Nb  Nb1  2  0.0  0.27  0.23  1.0
  O  O2  2  0.19  0.79  0.32  1.0
  O  O3  2  0.37  0.79  0.91  1.0
  O  O4  2  0.44  0.79  0.89  1.0

K K Nb Nb O O O O O O