data_[Na8Sr2Tl16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sr  0.9500  2.0000  1.3200
  Tl  1.6200  1.9000  1.3325
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [11.0090]
_cell_length_b [11.0090]
_cell_length_c [6.3686]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Na4SrTl8]
_chemical_formula_sum '[Na8 Sr2 Tl16]'
_cell_volume [771.8610]
_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  8  0.2500  0.2500  0.2500  1
  Sr  Sr1  2  0.0000  0.0000  0.0000  1
  Tl  Tl2  8  0.0000  0.2114  0.5000  1
  Tl  Tl3  8  0.0000  0.3537  0.0000  1
]