data_[Na4Ac8Sb4]
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
  Sb  2.0500  1.4500  0.8300
]
_symmetry_space_group_name_H-M [Fm-3m]
_cell_length_a [8.2400]
_cell_length_b [8.2400]
_cell_length_c [8.2400]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [225]
_chemical_formula_structural [NaAc2Sb]
_chemical_formula_sum '[Na4 Ac8 Sb4]'
_cell_volume [559.4670]
_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
[
  Na  Na0  4  0.0000  0.0000  0.5000  1
  Ac  Ac1  8  0.2500  0.2500  0.2500  1
  Sb  Sb2  4  0.0000  0.0000  0.0000  1
]