data_[Tb8Pm4Se16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tb  1.1000  1.7500  0.9815
  Pm  1.1300  1.8500  1.1100
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [4.0257]
_cell_length_b [13.5556]
_cell_length_c [13.9066]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Tb2PmSe4]
_chemical_formula_sum '[Tb8 Pm4 Se16]'
_cell_volume [758.8998]
_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
[
  Tb  Tb0  8  0.0000  0.1302  0.0688  1
  Pm  Pm1  4  0.0000  0.3746  0.2500  1
  Se  Se2  8  0.0000  0.2248  0.6209  1
  Se  Se3  4  0.0000  0.0345  0.2500  1
  Se  Se4  4  0.0000  0.5000  0.0000  1
]