data_[Tb12Ce4Pm8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tb  1.1000  1.7500  0.9815
  Ce  1.1200  1.8500  1.0800
  Pm  1.1300  1.8500  1.1100
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [5.0608]
_cell_length_b [10.1068]
_cell_length_c [15.2367]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [Tb3CePm2]
_chemical_formula_sum '[Tb12 Ce4 Pm8]'
_cell_volume [779.3282]
_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  0.0053  0.1678  1
  Tb  Tb1  4  0.0000  0.0000  0.5000  1
  Ce  Ce2  4  0.0000  0.2500  0.3308  1
  Pm  Pm3  4  0.0000  0.2500  0.0016  1
  Pm  Pm4  4  0.0000  0.2500  0.6670  1
]