data_[Pm20Tl4Sn8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Tl  1.6200  1.9000  1.3325
  Sn  1.9600  1.4500  0.8300
]
_symmetry_space_group_name_H-M [I4/mcm]
_cell_length_a [8.2897]
_cell_length_b [8.2897]
_cell_length_c [14.5033]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [140]
_chemical_formula_structural [Pm5TlSn2]
_chemical_formula_sum '[Pm20 Tl4 Sn8]'
_cell_volume [996.6604]
_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
[
  Pm  Pm0  16  0.1659  0.3341  0.8519  1
  Pm  Pm1  4  0.0000  0.0000  0.0000  1
  Tl  Tl2  4  0.0000  0.0000  0.2500  1
  Sn  Sn3  8  0.1340  0.6340  0.0000  1
]