data_Ta2Nb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.87
_cell_length_b   4.87
_cell_length_c   5.42
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta2Nb
_chemical_formula_sum   'Ta4 Nb2'
_cell_volume   111.29
_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  Ta2  1  0.0  0.0  0.0  1.0
  Ta  Ta3  1  0.0  0.0  0.71  1.0
  Ta  Ta4  1  0.0  0.81  0.06  1.0
  Ta  Ta5  1  0.44  0.41  0.35  1.0
  Nb  Nb0  1  0.0  0.81  0.35  1.0
  Nb  Nb1  1  0.44  0.41  0.06  1.0

data_Ta2Nb
_symmetry_space_group_name_H-M   P1
_cell_length_a   4.87
_cell_length_b   4.87
_cell_length_c   5.42
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta2Nb
_chemical_formula_sum   'Ta4 Nb2'
_cell_volume   111.29
_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  1  -0.0  0.81  0.06  1.0
  Ta  Ta1  1  0.0  0.0  0.0  1.0
  Ta  Ta2  1  0.0  0.0  0.71  1.0
  Ta  Ta3  1  0.44  0.41  0.35  1.0
  Nb  Nb4  1  -0.0  0.81  0.35  1.0
  Nb  Nb5  1  0.44  0.41  0.06  1.0

Ta Ta Ta Ta Nb Nb