data_[Pm9Nd18Er6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Nd  1.1400  1.8500  1.2765
  Er  1.2400  1.7500  1.0300
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [3.6408]
_cell_length_b [3.6408]
_cell_length_c [97.9768]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [Pm3(Nd3Er)2]
_chemical_formula_sum '[Pm9 Nd18 Er6]'
_cell_volume [1124.7030]
_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  6  0.0000  0.0000  0.2721  1
  Pm  Pm1  3  0.0000  0.0000  0.0000  1
  Nd  Nd2  6  0.0000  0.0000  0.0920  1
  Nd  Nd3  6  0.0000  0.0000  0.1822  1
  Nd  Nd4  6  0.0000  0.0000  0.3640  1
  Er  Er5  6  0.0000  0.0000  0.4549  1
]