data_[Pm8Er20]
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
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [15.6759]
_cell_length_b [6.2635]
_cell_length_c [9.1836]
_cell_angle_alpha [90.0000]
_cell_angle_beta [95.9591]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [Pm2Er5]
_chemical_formula_sum '[Pm8 Er20]'
_cell_volume [896.8268]
_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  8  0.0726  0.3322  0.6075  1
  Er  Er1  8  0.1449  0.1647  0.9652  1
  Er  Er2  8  0.2143  0.3331  0.3215  1
  Er  Er3  4  0.0000  0.1654  0.2500  1
]