data_[K2Ni2F6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Ni  1.9100  1.3500  0.7400
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [P6_3/mmc]
_cell_length_a [5.7976]
_cell_length_b [5.7976]
_cell_length_c [5.2127]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [194]
_chemical_formula_structural [KNiF3]
_chemical_formula_sum '[K2 Ni2 F6]'
_cell_volume [151.7359]
_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  2  0.3333  0.6667  0.2500  1.0
  Ni  Ni1  2  0.0000  0.0000  0.0000  1.0
  F  F2  6  0.1548  0.3096  0.7500  1.0
]