data_[Tb20Si8Ag4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tb  1.1000  1.7500  0.9815
  Si  1.9000  1.1000  0.5400
  Ag  1.9300  1.6000  1.0867
]
_symmetry_space_group_name_H-M [I4/mcm]
_cell_length_a [7.5020]
_cell_length_b [7.5020]
_cell_length_c [14.5036]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [140]
_chemical_formula_structural [Tb5Si2Ag]
_chemical_formula_sum '[Tb20 Si8 Ag4]'
_cell_volume [816.2599]
_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
[
  Tb  Tb0  16  0.1720  0.3280  0.6402  1
  Tb  Tb1  4  0.0000  0.0000  0.0000  1
  Si  Si2  8  0.1212  0.6212  0.5000  1
  Ag  Ag3  4  0.0000  0.0000  0.2500  1
]