data_[Na2Sn2Hg2Te6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sn  1.9600  1.4500  0.8300
  Hg  2.0000  1.5000  1.2450
  Te  2.1000  1.4000  1.2933
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [8.1620]
_cell_length_b [4.2822]
_cell_length_c [11.3982]
_cell_angle_alpha [90.0000]
_cell_angle_beta [101.5400]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaSnHgTe3]
_chemical_formula_sum '[Na2 Sn2 Hg2 Te6]'
_cell_volume [390.3266]
_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
[
  Na  Na0  2  0.2771  0.2500  0.3192  1.0
  Sn  Sn1  2  0.3128  0.7500  0.8840  1.0
  Hg  Hg2  2  0.0784  0.2500  0.6212  1.0
  Te  Te3  2  0.0358  0.2500  0.8613  1.0
  Te  Te4  2  0.2717  0.7500  0.5430  1.0
  Te  Te5  2  0.4213  0.7500  0.1468  1.0
]