data_[Ba2Na4Ni2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ba  0.8900  2.1500  1.4900
  Na  0.9300  1.8000  1.1600
  Ni  1.9100  1.3500  0.7400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [I-4m2]
_cell_length_a [5.8574]
_cell_length_b [5.8574]
_cell_length_c [7.1873]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [119]
_chemical_formula_structural [BaNa2NiO4]
_chemical_formula_sum '[Ba2 Na4 Ni2 O8]'
_cell_volume [246.5887]
_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
[
  Ba  Ba0  2  0.0000  0.5000  0.2500  1
  Na  Na1  2  0.0000  0.0000  0.0000  1
  Na  Na2  2  0.0000  0.5000  0.7500  1
  Ni  Ni3  2  0.0000  0.0000  0.5000  1
  O  O4  8  0.2199  0.2199  0.5000  1
]