data_[Pm2Zn16Fe8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Zn  1.6500  1.3500  0.8800
  Fe  1.8300  1.4000  0.8525
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [8.8323]
_cell_length_b [8.8323]
_cell_length_c [4.9767]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Pm(Zn2Fe)4]
_chemical_formula_sum '[Pm2 Zn16 Fe8]'
_cell_volume [388.2306]
_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  0.0000  0.0000  0.0000  1
  Zn  Zn1  8  0.0000  0.2296  0.5000  1
  Zn  Zn2  8  0.0000  0.3416  0.0000  1
  Fe  Fe3  8  0.2500  0.2500  0.2500  1
]