data_[Tb8Hg2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tb  1.1000  1.7500  0.9815
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [3.5912]
_cell_length_b [3.5912]
_cell_length_c [23.0364]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Tb4Hg]
_chemical_formula_sum '[Tb8 Hg2]'
_cell_volume [297.0929]
_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  4  0.0000  0.0000  0.1960  1
  Tb  Tb1  4  0.0000  0.0000  0.4125  1
  Hg  Hg2  2  0.0000  0.0000  0.0000  1
]