data_[Tb16Pm2Er4]
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
  Er  1.2400  1.7500  1.0300
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [5.5300]
_cell_length_b [8.1426]
_cell_length_c [15.8654]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [Tb8PmEr2]
_chemical_formula_sum '[Tb16 Pm2 Er4]'
_cell_volume [714.3875]
_cell_formula_units_Z [2]
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  0.2059  0.3614  1
  Tb  Tb1  4  0.0000  0.0000  0.1638  1
  Tb  Tb2  4  0.0000  0.2953  0.0000  1
  Pm  Pm3  2  0.0000  0.5000  0.5000  1
  Er  Er4  4  0.0000  0.5000  0.1997  1
]