data_[Pm6Sm9Y18]
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
  Y  1.2200  1.8000  1.0400
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [3.6042]
_cell_length_b [3.6042]
_cell_length_c [96.5092]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [Pm2(SmY2)3]
_chemical_formula_sum '[Pm6 Sm9 Y18]'
_cell_volume [1085.7406]
_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  0.4545  1
  Sm  Sm1  6  0.0000  0.0000  0.2728  1
  Sm  Sm2  3  0.0000  0.0000  0.0000  1
  Y  Y3  6  0.0000  0.0000  0.0908  1
  Y  Y4  6  0.0000  0.0000  0.1817  1
  Y  Y5  6  0.0000  0.0000  0.3636  1
]