data_[Ta4Cu2As2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ta  1.5000  1.4500  0.8200
  Cu  1.9000  1.3500  0.8200
  As  2.1800  1.1500  0.6600
]
_symmetry_space_group_name_H-M [Imm2]
_cell_length_a [3.2510]
_cell_length_b [4.4851]
_cell_length_c [8.7577]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [44]
_chemical_formula_structural [Ta2CuAs]
_chemical_formula_sum '[Ta4 Cu2 As2]'
_cell_volume [127.6957]
_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
[
  Ta  Ta0  2  0.0000  0.0000  0.9885  1
  Ta  Ta1  2  0.0000  0.5000  0.7683  1
  Cu  Cu2  2  0.0000  0.5000  0.2303  1
  As  As3  2  0.0000  0.0000  0.5128  1
]