data_[Y4Cu2As2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Y  1.2200  1.8000  1.0400
  Cu  1.9000  1.3500  0.8200
  As  2.1800  1.1500  0.6600
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [4.0823]
_cell_length_b [4.0520]
_cell_length_c [10.7804]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [Y2CuAs]
_chemical_formula_sum '[Y4 Cu2 As2]'
_cell_volume [178.3261]
_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
[
  Y  Y0  2  0.0000  0.0000  0.2662  1.0
  Y  Y1  2  0.5000  0.0000  0.9819  1.0
  Cu  Cu2  2  0.5000  0.0000  0.7034  1.0
  As  As3  2  0.0000  0.0000  0.5484  1.0
]