data_[Pm21Sn3Br36]
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
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [R-3]
_cell_length_a [15.4246]
_cell_length_b [15.4246]
_cell_length_c [10.0740]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [Pm7SnBr12]
_chemical_formula_sum '[Pm21 Sn3 Br36]'
_cell_volume [2075.6648]
_cell_formula_units_Z [3]
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  18  0.0496  0.8750  0.8326  1
  Pm  Pm1  3  0.0000  0.0000  0.5000  1
  Sn  Sn2  3  0.0000  0.0000  0.0000  1
  Br  Br3  18  0.0273  0.4382  0.6665  1
  Br  Br4  18  0.0507  0.8695  0.3430  1
]