The material structure described by Ta3Co8Al is Hexagonal Laves-derived structured and crystallizes in the trigonal R3m space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 16-coordinate geometry to one Ta(3), three equivalent Ta(2), three equivalent Co(1), three equivalent Co(4), and six equivalent Co(2) atoms. In the second Ta site, Ta(2) is bonded in a 16-coordinate geometry to three equivalent Ta(1), three equivalent Co(2), three equivalent Co(4), six equivalent Co(1), and one Al(1) atom. In the third Ta site, Ta(3) is bonded in a 16-coordinate geometry to one Ta(1), three equivalent Co(1), three equivalent Co(3), six equivalent Co(2), and three equivalent Al(1) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one Ta(1), one Ta(3), two equivalent Ta(2), one Co(3), one Co(4), four equivalent Co(1), and two equivalent Al(1) atoms to form CoTa4Al2Co6 cuboctahedra that share corners with two equivalent Co(3)Ta3Al3Co6 cuboctahedra, corners with two equivalent Co(4)Ta6Co6 cuboctahedra, corners with four equivalent Co(1)Ta4Al2Co6 cuboctahedra, corners with ten equivalent Co(2)Ta5AlCo6 cuboctahedra, edges with two equivalent Co(1)Ta4Al2Co6 cuboctahedra, edges with four equivalent Co(2)Ta5AlCo6 cuboctahedra, faces with three equivalent Co(3)Ta3Al3Co6 cuboctahedra, faces with three equivalent Co(4)Ta6Co6 cuboctahedra, faces with four equivalent Co(2)Ta5AlCo6 cuboctahedra, and faces with eight equivalent Co(1)Ta4Al2Co6 cuboctahedra. In the second Co site, Co(2) is bonded to one Ta(2), two equivalent Ta(1), two equivalent Ta(3), one Co(3), one Co(4), four equivalent Co(2), and one Al(1) atom to form CoTa5AlCo6 cuboctahedra that share corners with two equivalent Co(3)Ta3Al3Co6 cuboctahedra, corners with two equivalent Co(4)Ta6Co6 cuboctahedra, corners with four equivalent Co(2)Ta5AlCo6 cuboctahedra, corners with ten equivalent Co(1)Ta4Al2Co6 cuboctahedra, edges with two equivalent Co(2)Ta5AlCo6 cuboctahedra, edges with four equivalent Co(1)Ta4Al2Co6 cuboctahedra, faces with three equivalent Co(3)Ta3Al3Co6 cuboctahedra, faces with three equivalent Co(4)Ta6Co6 cuboctahedra, faces with four equivalent Co(1)Ta4Al2Co6 cuboctahedra, and faces with eight equivalent Co(2)Ta5AlCo6 cuboctahedra. In the third Co site, Co(3) is bonded to three equivalent Ta(3), three equivalent Co(1), three equivalent Co(2), and three equivalent Al(1) atoms to form CoTa3Al3Co6 cuboctahedra that share corners with six equivalent Co(1)Ta4Al2Co6 cuboctahedra, corners with six equivalent Co(2)Ta5AlCo6 cuboctahedra, corners with six equivalent Co(4)Ta6Co6 cuboctahedra, edges with six equivalent Co(3)Ta3Al3Co6 cuboctahedra, faces with nine equivalent Co(1)Ta4Al2Co6 cuboctahedra, and faces with nine equivalent Co(2)Ta5AlCo6 cuboctahedra. In the fourth Co site, Co(4) is bonded to three equivalent Ta(1), three equivalent Ta(2), three equivalent Co(1), and three equivalent Co(2) atoms to form CoTa6Co6 cuboctahedra that share corners with six equivalent Co(3)Ta3Al3Co6 cuboctahedra, corners with six equivalent Co(1)Ta4Al2Co6 cuboctahedra, corners with six equivalent Co(2)Ta5AlCo6 cuboctahedra, edges with six equivalent Co(4)Ta6Co6 cuboctahedra, faces with nine equivalent Co(1)Ta4Al2Co6 cuboctahedra, and faces with nine equivalent Co(2)Ta5AlCo6 cuboctahedra. Al(1) is bonded in a 16-coordinate geometry to one Ta(2), three equivalent Ta(3), three equivalent Co(2), three equivalent Co(3), and six equivalent Co(1) atoms. is represented by the CIF card [CIF]
data_Ta3AlCo8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.203
_cell_length_b   8.203
_cell_length_c   8.203
_cell_angle_alpha   33.672
_cell_angle_beta   33.672
_cell_angle_gamma   33.672
_symmetry_Int_Tables_number   1
_cell_volume   151.149
_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  0.623  0.623  0.623  1.0
  Ta  Ta1  1  0.003  0.003  0.003  1.0
  Ta  Ta2  1  0.498  0.498  0.498  1.0
  Al  Al3  1  0.126  0.126  0.126  1.0
  Co  Co4  1  0.563  0.563  0.060  1.0
  Co  Co5  1  0.064  0.064  0.561  1.0
  Co  Co6  1  0.563  0.060  0.563  1.0
  Co  Co7  1  0.064  0.561  0.064  1.0
  Co  Co8  1  0.812  0.812  0.812  1.0
  Co  Co9  1  0.312  0.312  0.312  1.0
  Co  Co10  1  0.060  0.563  0.563  1.0
  Co  Co11  1  0.561  0.064  0.064  1.0
[/CIF]
.
The material structure described by Ta3Co8Al is Hexagonal Laves-derived structured and crystallizes in the trigonal R3m space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 16-coordinate geometry to one Ta(3), three equivalent Ta(2), three equivalent Co(1), three equivalent Co(4), and six equivalent Co(2) atoms. In the second Ta site, Ta(2) is bonded in a 16-coordinate geometry to three equivalent Ta(1), three equivalent Co(2), three equivalent Co(4), six equivalent Co(1), and one Al(1) atom. In the third Ta site, Ta(3) is bonded in a 16-coordinate geometry to one Ta(1), three equivalent Co(1), three equivalent Co(3), six equivalent Co(2), and three equivalent Al(1) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one Ta(1), one Ta(3), two equivalent Ta(2), one Co(3), one Co(4), four equivalent Co(1), and two equivalent Al(1) atoms to form CoTa4Al2Co6 cuboctahedra that share corners with two equivalent Co(3)Ta3Al3Co6 cuboctahedra, corners with two equivalent Co(4)Ta6Co6 cuboctahedra, corners with four equivalent Co(1)Ta4Al2Co6 cuboctahedra, corners with ten equivalent Co(2)Ta5AlCo6 cuboctahedra, edges with two equivalent Co(1)Ta4Al2Co6 cuboctahedra, edges with four equivalent Co(2)Ta5AlCo6 cuboctahedra, faces with three equivalent Co(3)Ta3Al3Co6 cuboctahedra, faces with three equivalent Co(4)Ta6Co6 cuboctahedra, faces with four equivalent Co(2)Ta5AlCo6 cuboctahedra, and faces with eight equivalent Co(1)Ta4Al2Co6 cuboctahedra. In the second Co site, Co(2) is bonded to one Ta(2), two equivalent Ta(1), two equivalent Ta(3), one Co(3), one Co(4), four equivalent Co(2), and one Al(1) atom to form CoTa5AlCo6 cuboctahedra that share corners with two equivalent Co(3)Ta3Al3Co6 cuboctahedra, corners with two equivalent Co(4)Ta6Co6 cuboctahedra, corners with four equivalent Co(2)Ta5AlCo6 cuboctahedra, corners with ten equivalent Co(1)Ta4Al2Co6 cuboctahedra, edges with two equivalent Co(2)Ta5AlCo6 cuboctahedra, edges with four equivalent Co(1)Ta4Al2Co6 cuboctahedra, faces with three equivalent Co(3)Ta3Al3Co6 cuboctahedra, faces with three equivalent Co(4)Ta6Co6 cuboctahedra, faces with four equivalent Co(1)Ta4Al2Co6 cuboctahedra, and faces with eight equivalent Co(2)Ta5AlCo6 cuboctahedra. In the third Co site, Co(3) is bonded to three equivalent Ta(3), three equivalent Co(1), three equivalent Co(2), and three equivalent Al(1) atoms to form CoTa3Al3Co6 cuboctahedra that share corners with six equivalent Co(1)Ta4Al2Co6 cuboctahedra, corners with six equivalent Co(2)Ta5AlCo6 cuboctahedra, corners with six equivalent Co(4)Ta6Co6 cuboctahedra, edges with six equivalent Co(3)Ta3Al3Co6 cuboctahedra, faces with nine equivalent Co(1)Ta4Al2Co6 cuboctahedra, and faces with nine equivalent Co(2)Ta5AlCo6 cuboctahedra. In the fourth Co site, Co(4) is bonded to three equivalent Ta(1), three equivalent Ta(2), three equivalent Co(1), and three equivalent Co(2) atoms to form CoTa6Co6 cuboctahedra that share corners with six equivalent Co(3)Ta3Al3Co6 cuboctahedra, corners with six equivalent Co(1)Ta4Al2Co6 cuboctahedra, corners with six equivalent Co(2)Ta5AlCo6 cuboctahedra, edges with six equivalent Co(4)Ta6Co6 cuboctahedra, faces with nine equivalent Co(1)Ta4Al2Co6 cuboctahedra, and faces with nine equivalent Co(2)Ta5AlCo6 cuboctahedra. Al(1) is bonded in a 16-coordinate geometry to one Ta(2), three equivalent Ta(3), three equivalent Co(2), three equivalent Co(3), and six equivalent Co(1) atoms. is represented by the CIF card [CIF]
data_Ta3AlCo8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.203
_cell_length_b   8.203
_cell_length_c   8.203
_cell_angle_alpha   33.672
_cell_angle_beta   33.672
_cell_angle_gamma   33.672
_symmetry_Int_Tables_number   1
_cell_volume   151.149
_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  0.623  0.623  0.623  1.0
  Ta  Ta1  1  0.003  0.003  0.003  1.0
  Ta  Ta2  1  0.498  0.498  0.498  1.0
  Al  Al3  1  0.126  0.126  0.126  1.0
  Co  Co4  1  0.563  0.563  0.060  1.0
  Co  Co5  1  0.064  0.064  0.561  1.0
  Co  Co6  1  0.563  0.060  0.563  1.0
  Co  Co7  1  0.064  0.561  0.064  1.0
  Co  Co8  1  0.812  0.812  0.812  1.0
  Co  Co9  1  0.312  0.312  0.312  1.0
  Co  Co10  1  0.060  0.563  0.563  1.0
  Co  Co11  1  0.561  0.064  0.064  1.0
[/CIF]
.