data_[Na2Ac4Ni2O10]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ac  1.1000  1.9500  1.2600
  Ni  1.9100  1.3500  0.7400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P4/mbm]
_cell_length_a [7.1500]
_cell_length_b [7.1500]
_cell_length_c [5.6953]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [127]
_chemical_formula_structural [NaAc2NiO5]
_chemical_formula_sum '[Na2 Ac4 Ni2 O10]'
_cell_volume [291.1538]
_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
[
  Na  Na0  2  0.0000  0.0000  0.0000  1
  Ac  Ac1  4  0.1815  0.3185  0.5000  1
  Ni  Ni2  2  0.0000  0.5000  0.0000  1
  O  O3  8  0.1262  0.6262  0.2334  1
  O  O4  2  0.0000  0.0000  0.5000  1
]