data_[Pm8Sm8As20]
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
  As  2.1800  1.1500  0.6600
]
_symmetry_space_group_name_H-M [Cmce]
_cell_length_a [15.4979]
_cell_length_b [7.6656]
_cell_length_c [7.7599]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [64]
_chemical_formula_structural [Pm2Sm2As5]
_chemical_formula_sum '[Pm8 Sm8 As20]'
_cell_volume [921.8869]
_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  0.1877  0.0000  0.0000  1
  Sm  Sm1  8  0.0000  0.1672  0.6692  1
  As  As2  16  0.1387  0.1233  0.3762  1
  As  As3  4  0.0000  0.0000  0.0000  1
]