data_[Na6Yb2As4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Yb  1.1000  1.7500  1.0840
  As  2.1800  1.1500  0.6600
]
_symmetry_space_group_name_H-M [Pmma]
_cell_length_a [4.7232]
_cell_length_b [21.7469]
_cell_length_c [10.2672]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [51]
_chemical_formula_structural [Na3YbAs2]
_chemical_formula_sum '[Na6 Yb2 As4]'
_cell_volume [1054.5928]
_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  4  0.2500  0.3449  0.3703  1
  Na  Na1  2  0.2500  0.5000  0.8686  1
  Yb  Yb2  2  0.2500  0.5000  0.3854  1
  As  As3  4  0.2500  0.4168  0.6476  1
]