data_TaAl2Co
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.22
_cell_length_b   5.22
_cell_length_c   5.22
_cell_angle_alpha   146.36
_cell_angle_beta   130.81
_cell_angle_gamma   60.92
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TaAl2Co
_chemical_formula_sum   'Ta1 Al2 Co1'
_cell_volume   58.96
_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
  Ta  Ta3  1  0.51  0.0  0.04  1.0
  Al  Al0  1  0.0  0.0  0.47  1.0
  Al  Al1  1  0.0  0.17  0.51  1.0
  Co  Co2  1  0.0  0.0  0.96  1.0

data_TaAl2Co
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.02
_cell_length_b   4.34
_cell_length_c   5.22
_cell_angle_alpha   114.6
_cell_angle_beta   106.82
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TaAl2Co
_chemical_formula_sum   'Ta1 Al2 Co1'
_cell_volume   58.96
_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
  Ta  Ta0  1  0.0  0.04  0.53  1.0
  Al  Al1  1  0.0  0.47  0.47  1.0
  Al  Al2  1  0.83  0.34  0.34  1.0
  Co  Co3  1  0.0  0.96  0.96  1.0

Ta Al Al Co
TaCoAl2 crystallizes in the triclinic P1 space group. Ta(1) is bonded in a 4-coordinate geometry to one Co(1), one Al(2), and two equivalent Al(1) atoms. The Ta(1)-Co(1) bond length is 2.40 Å. The Ta(1)-Al(2) bond length is 1.93 Å. There is one shorter (2.02 Å) and one longer (2.36 Å) Ta(1)-Al(1) bond length. Co(1) is bonded in a 4-coordinate geometry to one Ta(1), one Al(1), and two equivalent Al(2) atoms. The Co(1)-Al(1) bond length is 2.55 Å. There is one shorter (2.17 Å) and one longer (2.70 Å) Co(1)-Al(2) bond length. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted single-bond geometry to two equivalent Ta(1), one Co(1), and one Al(2) atom. The Al(1)-Al(2) bond length is 0.74 Å. In the second Al site, Al(2) is bonded in a 1-coordinate geometry to one Ta(1), two equivalent Co(1), and one Al(1) atom.