data_[Pm20Si8Pb4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Si  1.9000  1.1000  0.5400
  Pb  2.3300  1.8000  1.1225
]
_symmetry_space_group_name_H-M [I4/mcm]
_cell_length_a [7.8880]
_cell_length_b [7.8880]
_cell_length_c [14.5023]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [140]
_chemical_formula_structural [Pm5Si2Pb]
_chemical_formula_sum '[Pm20 Si8 Pb4]'
_cell_volume [902.3423]
_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  0.1711  0.3289  0.3623  1
  Pm  Pm1  4  0.0000  0.0000  0.0000  1
  Si  Si2  8  0.1228  0.6228  0.5000  1
  Pb  Pb3  4  0.0000  0.0000  0.2500  1
]