The structure described by Ta2Al is beta Uranium-derived structured and crystallizes in the tetragonal P4_2/mnm space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 15-coordinate geometry to one Ta(1), two equivalent Ta(2), six equivalent Ta(3), two equivalent Al(1), and four equivalent Al(2) atoms. In the second Ta site, Ta(2) is bonded in a 6-coordinate geometry to one Ta(1), one Ta(2), and four equivalent Al(2) atoms. In the third Ta site, Ta(3) is bonded in a 7-coordinate geometry to two equivalent Ta(3), three equivalent Ta(1), one Al(1), and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Ta(1), four equivalent Ta(3), and four equivalent Al(2) atoms to form AlTa8Al4 cuboctahedra that share corners with sixteen equivalent Al(2)Ta10Al2 cuboctahedra, edges with two equivalent Al(1)Ta8Al4 cuboctahedra, and faces with four equivalent Al(2)Ta10Al2 cuboctahedra. In the second Al site, Al(2) is bonded to two equivalent Ta(1), four equivalent Ta(2), four equivalent Ta(3), one Al(1), and one Al(2) atom to form AlTa10Al2 cuboctahedra that share corners with four equivalent Al(1)Ta8Al4 cuboctahedra, corners with seven equivalent Al(2)Ta10Al2 cuboctahedra, edges with three equivalent Al(2)Ta10Al2 cuboctahedra,  a faceface with one Al(1)Ta8Al4 cuboctahedra, and faces with six equivalent Al(2)Ta10Al2 cuboctahedra. is represented by the CIF card [CIF]
data_Ta2Al
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.195
_cell_length_b   9.905
_cell_length_c   9.905
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   509.679
_cell_formula_units_Z   10
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  0.500  0.102  0.898  1.0
  Ta  Ta1  1  0.500  0.898  0.102  1.0
  Ta  Ta2  1  0.000  0.398  0.398  1.0
  Ta  Ta3  1  0.000  0.602  0.602  1.0
  Ta  Ta4  1  0.500  0.371  0.964  1.0
  Ta  Ta5  1  0.500  0.629  0.036  1.0
  Ta  Ta6  1  0.000  0.129  0.464  1.0
  Ta  Ta7  1  0.000  0.871  0.536  1.0
  Ta  Ta8  1  0.500  0.964  0.371  1.0
  Ta  Ta9  1  0.500  0.036  0.629  1.0
  Ta  Ta10  1  0.000  0.464  0.129  1.0
  Ta  Ta11  1  0.000  0.536  0.871  1.0
  Ta  Ta12  1  0.248  0.319  0.681  1.0
  Ta  Ta13  1  0.248  0.681  0.319  1.0
  Ta  Ta14  1  0.748  0.181  0.181  1.0
  Ta  Ta15  1  0.748  0.819  0.819  1.0
  Ta  Ta16  1  0.752  0.681  0.319  1.0
  Ta  Ta17  1  0.752  0.319  0.681  1.0
  Ta  Ta18  1  0.252  0.819  0.819  1.0
  Ta  Ta19  1  0.252  0.181  0.181  1.0
  Al  Al20  1  0.500  0.500  0.500  1.0
  Al  Al21  1  0.000  0.000  0.000  1.0
  Al  Al22  1  0.500  0.434  0.238  1.0
  Al  Al23  1  0.500  0.566  0.762  1.0
  Al  Al24  1  0.000  0.066  0.738  1.0
  Al  Al25  1  0.000  0.934  0.262  1.0
  Al  Al26  1  0.500  0.238  0.434  1.0
  Al  Al27  1  0.500  0.762  0.566  1.0
  Al  Al28  1  0.000  0.738  0.066  1.0
  Al  Al29  1  0.000  0.262  0.934  1.0
[/CIF]
.
The structure described by Ta2Al is beta Uranium-derived structured and crystallizes in the tetragonal P4_2/mnm space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 15-coordinate geometry to one Ta(1), two equivalent Ta(2), six equivalent Ta(3), two equivalent Al(1), and four equivalent Al(2) atoms. In the second Ta site, Ta(2) is bonded in a 6-coordinate geometry to one Ta(1), one Ta(2), and four equivalent Al(2) atoms. In the third Ta site, Ta(3) is bonded in a 7-coordinate geometry to two equivalent Ta(3), three equivalent Ta(1), one Al(1), and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Ta(1), four equivalent Ta(3), and four equivalent Al(2) atoms to form AlTa8Al4 cuboctahedra that share corners with sixteen equivalent Al(2)Ta10Al2 cuboctahedra, edges with two equivalent Al(1)Ta8Al4 cuboctahedra, and faces with four equivalent Al(2)Ta10Al2 cuboctahedra. In the second Al site, Al(2) is bonded to two equivalent Ta(1), four equivalent Ta(2), four equivalent Ta(3), one Al(1), and one Al(2) atom to form AlTa10Al2 cuboctahedra that share corners with four equivalent Al(1)Ta8Al4 cuboctahedra, corners with seven equivalent Al(2)Ta10Al2 cuboctahedra, edges with three equivalent Al(2)Ta10Al2 cuboctahedra,  a faceface with one Al(1)Ta8Al4 cuboctahedra, and faces with six equivalent Al(2)Ta10Al2 cuboctahedra. is represented by the CIF card [CIF]
data_Ta2Al
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.195
_cell_length_b   9.905
_cell_length_c   9.905
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   509.679
_cell_formula_units_Z   10
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  0.500  0.102  0.898  1.0
  Ta  Ta1  1  0.500  0.898  0.102  1.0
  Ta  Ta2  1  0.000  0.398  0.398  1.0
  Ta  Ta3  1  0.000  0.602  0.602  1.0
  Ta  Ta4  1  0.500  0.371  0.964  1.0
  Ta  Ta5  1  0.500  0.629  0.036  1.0
  Ta  Ta6  1  0.000  0.129  0.464  1.0
  Ta  Ta7  1  0.000  0.871  0.536  1.0
  Ta  Ta8  1  0.500  0.964  0.371  1.0
  Ta  Ta9  1  0.500  0.036  0.629  1.0
  Ta  Ta10  1  0.000  0.464  0.129  1.0
  Ta  Ta11  1  0.000  0.536  0.871  1.0
  Ta  Ta12  1  0.248  0.319  0.681  1.0
  Ta  Ta13  1  0.248  0.681  0.319  1.0
  Ta  Ta14  1  0.748  0.181  0.181  1.0
  Ta  Ta15  1  0.748  0.819  0.819  1.0
  Ta  Ta16  1  0.752  0.681  0.319  1.0
  Ta  Ta17  1  0.752  0.319  0.681  1.0
  Ta  Ta18  1  0.252  0.819  0.819  1.0
  Ta  Ta19  1  0.252  0.181  0.181  1.0
  Al  Al20  1  0.500  0.500  0.500  1.0
  Al  Al21  1  0.000  0.000  0.000  1.0
  Al  Al22  1  0.500  0.434  0.238  1.0
  Al  Al23  1  0.500  0.566  0.762  1.0
  Al  Al24  1  0.000  0.066  0.738  1.0
  Al  Al25  1  0.000  0.934  0.262  1.0
  Al  Al26  1  0.500  0.238  0.434  1.0
  Al  Al27  1  0.500  0.762  0.566  1.0
  Al  Al28  1  0.000  0.738  0.066  1.0
  Al  Al29  1  0.000  0.262  0.934  1.0
[/CIF]
.