data_[Tb12Si4N4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tb  1.1000  1.7500  0.9815
  Si  1.9000  1.1000  0.5400
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.6675]
_cell_length_b [12.3030]
_cell_length_c [9.4240]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Tb3SiN]
_chemical_formula_sum '[Tb12 Si4 N4]'
_cell_volume [425.2214]
_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  0.3734  0.5528  1.0
  Tb  Tb1  4  0.0000  0.0575  0.7500  1.0
  Si  Si2  4  0.0000  0.2564  0.2500  1.0
  N  N3  4  0.0000  0.0000  0.0000  1.0
]