data_BaTa2As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.36
_cell_length_b   4.36
_cell_length_c   4.69
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BaTa2As
_chemical_formula_sum   'Ba1 Ta2 As1'
_cell_volume   88.99
_cell_formula_units_Z   1
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
  Ba  Ba1  1  0.18  0.18  0.0  1.0
  Ta  Ta2  1  0.18  0.0  0.34  1.0
  Ta  Ta3  1  0.0  0.18  0.34  1.0
  As  As0  1  0.0  0.0  0.0  1.0

data_BaTa2As
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.16
_cell_length_b   6.16
_cell_length_c   4.69
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   BaTa2As
_chemical_formula_sum   'Ba2 Ta4 As2'
_cell_volume   177.98
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Ba  Ba0  2  0.18  0.0  0.0  1.0
  Ta  Ta1  4  0.09  0.09  0.34  1.0
  As  As2  2  0.0  0.0  0.0  1.0

Ba Ta Ta As
BaTa2As is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two BaTa2As clusters. Ba(1) is bonded in a single-bond geometry to two equivalent Ta(1) and one As(1) atom. Both Ba(1)-Ta(1) bond lengths are 1.79 Å. The Ba(1)-As(1) bond length is 1.10 Å. Ta(1) is bonded in a 3-coordinate geometry to one Ba(1), one Ta(1), and one As(1) atom. The Ta(1)-Ta(1) bond length is 1.10 Å. The Ta(1)-As(1) bond length is 1.79 Å. As(1) is bonded in a single-bond geometry to one Ba(1) and two equivalent Ta(1) atoms.