data_[Pm18Sm22Er8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Sm  1.1700  1.8500  1.2290
  Er  1.2400  1.7500  1.0300
]
_symmetry_space_group_name_H-M [Cmmm]
_cell_length_a [20.9406]
_cell_length_b [21.4473]
_cell_length_c [3.5875]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [65]
_chemical_formula_structural [Pm9Sm11Er4]
_chemical_formula_sum '[Pm18 Sm22 Er8]'
_cell_volume [1611.1969]
_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  8  0.1228  0.0846  0.5000  1
  Pm  Pm1  8  0.1228  0.2545  0.5000  1
  Pm  Pm2  2  0.0000  0.5000  0.5000  1
  Sm  Sm3  8  0.2479  0.1679  0.0000  1
  Sm  Sm4  4  0.0000  0.1709  0.0000  1
  Sm  Sm5  4  0.0000  0.3462  0.0000  1
  Sm  Sm6  4  0.2447  0.0000  0.0000  1
  Sm  Sm7  2  0.0000  0.0000  0.0000  1
  Er  Er8  8  0.1369  0.4162  0.5000  1
]