data_[Pm4Sn2Pb2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Sn  1.9600  1.4500  0.8300
  Pb  2.3300  1.8000  1.1225
]
_symmetry_space_group_name_H-M [Pmma]
_cell_length_a [5.0478]
_cell_length_b [4.5406]
_cell_length_c [10.0819]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [51]
_chemical_formula_structural [Pm2SnPb]
_chemical_formula_sum '[Pm4 Sn2 Pb2]'
_cell_volume [231.0750]
_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
[
  Pm  Pm0  2  0.2500  0.0000  0.3696  1
  Pm  Pm1  2  0.2500  0.0000  0.8802  1
  Sn  Sn2  2  0.2500  0.5000  0.1238  1
  Pb  Pb3  2  0.2500  0.5000  0.6263  1
]