data_[Rb4Tl4Bi2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Tl  1.6200  1.9000  1.3325
  Bi  2.0200  1.6000  1.0350
]
_symmetry_space_group_name_H-M [P4/mbm]
_cell_length_a [8.4241]
_cell_length_b [8.4241]
_cell_length_c [6.0744]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [127]
_chemical_formula_structural [Rb2Tl2Bi]
_chemical_formula_sum '[Rb4 Tl4 Bi2]'
_cell_volume [431.0676]
_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
[
  Rb  Rb0  4  0.1863  0.3137  0.5000  1.0
  Tl  Tl1  4  0.1287  0.6287  0.0000  1.0
  Bi  Bi2  2  0.0000  0.0000  0.0000  1.0
]