data_[Pr6Sm3Y3Se18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pr  1.1300  1.8500  1.0600
  Sm  1.1700  1.8500  1.2290
  Y  1.2200  1.8000  1.0400
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [7.4300]
_cell_length_b [7.4300]
_cell_length_c [19.7273]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [Pr2SmYSe6]
_chemical_formula_sum '[Pr6 Sm3 Y3 Se18]'
_cell_volume [943.1452]
_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
[
  Pr  Pr0  3  0.0000  0.0000  0.4797  1
  Pr  Pr1  3  0.0000  0.0000  0.9811  1
  Sm  Sm2  3  0.0000  0.0000  0.1832  1
  Y  Y3  3  0.0000  0.0000  0.6814  1
  Se  Se4  9  0.0410  0.3546  0.7518  1
  Se  Se5  9  0.0426  0.6799  0.2524  1
]