data_[Pm4Er16Al8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Er  1.2400  1.7500  1.0300
  Al  1.6100  1.2500  0.6750
]
_symmetry_space_group_name_H-M [Fmmm]
_cell_length_a [6.6915]
_cell_length_b [10.3594]
_cell_length_c [11.5062]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [69]
_chemical_formula_structural [Pm(Er2Al)2]
_chemical_formula_sum '[Pm4 Er16 Al8]'
_cell_volume [797.6036]
_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  4  0.0000  0.0000  0.0000  1
  Er  Er1  8  0.0000  0.1616  0.5000  1
  Er  Er2  8  0.2500  0.2500  0.2500  1
  Al  Al3  8  0.0000  0.0000  0.2755  1
]