data_Ba2TaCo
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.08
_cell_length_b   6.08
_cell_length_c   6.08
_cell_angle_alpha   135.8
_cell_angle_beta   135.8
_cell_angle_gamma   64.29
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ba2TaCo
_chemical_formula_sum   'Ba2 Ta1 Co1'
_cell_volume   107.73
_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  Ba0  1  0.0  0.29  0.57  1.0
  Ba  Ba1  1  0.29  0.0  0.57  1.0
  Ta  Ta3  1  0.0  0.0  0.15  1.0
  Co  Co2  1  0.0  0.0  0.0  1.0

data_Ba2TaCo
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.47
_cell_length_b   6.47
_cell_length_c   6.08
_cell_angle_alpha   90.0
_cell_angle_beta   122.15
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ba2TaCo
_chemical_formula_sum   'Ba4 Ta2 Co2'
_cell_volume   215.46
_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  4  0.36  0.36  0.29  1.0
  Ta  Ta1  2  0.0  0.0  0.15  1.0
  Co  Co2  2  0.0  0.0  0.0  1.0

Ba Ba Ta Co
Ba2TaCo crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Ba2TaCo clusters. Ba(1) is bonded in a distorted single-bond geometry to one Ta(1) atom. The Ba(1)-Ta(1) bond length is 1.81 Å. Ta(1) is bonded in a 3-coordinate geometry to two equivalent Ba(1) and one Co(1) atom. The Ta(1)-Co(1) bond length is 0.90 Å. Co(1) is bonded in a single-bond geometry to one Ta(1) atom.