The material structure described by CoTa is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the trigonal R-3m space group. There are seven inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 16-coordinate geometry to one Ta(3), three equivalent Ta(1), three equivalent Ta(7), and nine equivalent Co(2) atoms. In the second Ta site, Ta(2) is bonded in a 16-coordinate geometry to one Ta(4), three equivalent Ta(2), three equivalent Co(3), and nine equivalent Co(1) atoms. In the third Ta site, Ta(3) is bonded in a 8-coordinate geometry to one Ta(1), one Ta(4), and six equivalent Co(2) atoms. In the fourth Ta site, Ta(4) is bonded in a 8-coordinate geometry to one Ta(2), one Ta(3), and six equivalent Co(1) atoms. In the fifth Ta site, Ta(5) is bonded in a 6-coordinate geometry to three equivalent Co(1) and three equivalent Co(2) atoms. In the sixth Ta site, Ta(6) is bonded in a 6-coordinate geometry to three equivalent Co(1) and three equivalent Co(2) atoms. In the seventh Ta site, Ta(7) is bonded in a distorted hexagonal planar geometry to six equivalent Ta(1) and six equivalent Co(2) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one Ta(5), one Ta(6), two equivalent Ta(4), three equivalent Ta(2), one Co(3), and four equivalent Co(1) atoms to form distorted CoTa7Co5 cuboctahedra that share corners with two equivalent Co(3)Ta6Co6 cuboctahedra, corners with four equivalent Co(2)Ta8Co4 cuboctahedra, corners with nine equivalent Co(1)Ta7Co5 cuboctahedra,  an edgeedge with one Co(2)Ta8Co4 cuboctahedra, edges with four equivalent Co(1)Ta7Co5 cuboctahedra, faces with three equivalent Co(3)Ta6Co6 cuboctahedra, and faces with ten equivalent Co(1)Ta7Co5 cuboctahedra. In the second Co site, Co(2) is bonded to one Ta(5), one Ta(6), one Ta(7), two equivalent Ta(3), three equivalent Ta(1), and four equivalent Co(2) atoms to form distorted CoTa8Co4 cuboctahedra that share corners with four equivalent Co(1)Ta7Co5 cuboctahedra, corners with nine equivalent Co(2)Ta8Co4 cuboctahedra,  an edgeedge with one Co(1)Ta7Co5 cuboctahedra, edges with four equivalent Co(2)Ta8Co4 cuboctahedra, and faces with ten equivalent Co(2)Ta8Co4 cuboctahedra. In the third Co site, Co(3) is bonded to six equivalent Ta(2) and six equivalent Co(1) atoms to form CoTa6Co6 cuboctahedra that share corners with twelve equivalent Co(1)Ta7Co5 cuboctahedra, edges with six equivalent Co(3)Ta6Co6 cuboctahedra, and faces with eighteen equivalent Co(1)Ta7Co5 cuboctahedra. is represented by the CIF card [CIF]
data_TaCo
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.895
_cell_length_b   4.895
_cell_length_c   17.509
_cell_angle_alpha   81.969
_cell_angle_beta   90.000
_cell_angle_gamma   119.998
_symmetry_Int_Tables_number   1
_cell_volume   358.543
_cell_formula_units_Z   13
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  0.173  0.347  0.480  1.0
  Ta  Ta1  1  0.671  0.342  0.986  1.0
  Ta  Ta2  1  0.329  0.658  0.014  1.0
  Ta  Ta3  1  0.827  0.653  0.520  1.0
  Ta  Ta4  1  0.226  0.452  0.323  1.0
  Ta  Ta5  1  0.724  0.448  0.828  1.0
  Ta  Ta6  1  0.276  0.552  0.172  1.0
  Ta  Ta7  1  0.774  0.548  0.677  1.0
  Ta  Ta8  1  0.584  0.167  0.249  1.0
  Ta  Ta9  1  0.082  0.165  0.753  1.0
  Ta  Ta10  1  0.918  0.835  0.247  1.0
  Ta  Ta11  1  0.416  0.833  0.751  1.0
  Ta  Ta12  1  0.500  0.000  0.500  1.0
  Co  Co13  1  0.797  0.090  0.113  1.0
  Co  Co14  1  0.289  0.092  0.619  1.0
  Co  Co15  1  0.293  0.090  0.113  1.0
  Co  Co16  1  0.802  0.092  0.619  1.0
  Co  Co17  1  0.797  0.594  0.113  1.0
  Co  Co18  1  0.289  0.579  0.619  1.0
  Co  Co19  1  0.711  0.908  0.381  1.0
  Co  Co20  1  0.203  0.910  0.887  1.0
  Co  Co21  1  0.198  0.908  0.381  1.0
  Co  Co22  1  0.707  0.910  0.887  1.0
  Co  Co23  1  0.711  0.421  0.381  1.0
  Co  Co24  1  0.203  0.406  0.887  1.0
  Co  Co25  1  0.000  0.000  0.000  1.0
[/CIF]
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The material structure described by CoTa is Frank-Kasper $\mu$ Phase-like structured and crystallizes in the trigonal R-3m space group. There are seven inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 16-coordinate geometry to one Ta(3), three equivalent Ta(1), three equivalent Ta(7), and nine equivalent Co(2) atoms. In the second Ta site, Ta(2) is bonded in a 16-coordinate geometry to one Ta(4), three equivalent Ta(2), three equivalent Co(3), and nine equivalent Co(1) atoms. In the third Ta site, Ta(3) is bonded in a 8-coordinate geometry to one Ta(1), one Ta(4), and six equivalent Co(2) atoms. In the fourth Ta site, Ta(4) is bonded in a 8-coordinate geometry to one Ta(2), one Ta(3), and six equivalent Co(1) atoms. In the fifth Ta site, Ta(5) is bonded in a 6-coordinate geometry to three equivalent Co(1) and three equivalent Co(2) atoms. In the sixth Ta site, Ta(6) is bonded in a 6-coordinate geometry to three equivalent Co(1) and three equivalent Co(2) atoms. In the seventh Ta site, Ta(7) is bonded in a distorted hexagonal planar geometry to six equivalent Ta(1) and six equivalent Co(2) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one Ta(5), one Ta(6), two equivalent Ta(4), three equivalent Ta(2), one Co(3), and four equivalent Co(1) atoms to form distorted CoTa7Co5 cuboctahedra that share corners with two equivalent Co(3)Ta6Co6 cuboctahedra, corners with four equivalent Co(2)Ta8Co4 cuboctahedra, corners with nine equivalent Co(1)Ta7Co5 cuboctahedra,  an edgeedge with one Co(2)Ta8Co4 cuboctahedra, edges with four equivalent Co(1)Ta7Co5 cuboctahedra, faces with three equivalent Co(3)Ta6Co6 cuboctahedra, and faces with ten equivalent Co(1)Ta7Co5 cuboctahedra. In the second Co site, Co(2) is bonded to one Ta(5), one Ta(6), one Ta(7), two equivalent Ta(3), three equivalent Ta(1), and four equivalent Co(2) atoms to form distorted CoTa8Co4 cuboctahedra that share corners with four equivalent Co(1)Ta7Co5 cuboctahedra, corners with nine equivalent Co(2)Ta8Co4 cuboctahedra,  an edgeedge with one Co(1)Ta7Co5 cuboctahedra, edges with four equivalent Co(2)Ta8Co4 cuboctahedra, and faces with ten equivalent Co(2)Ta8Co4 cuboctahedra. In the third Co site, Co(3) is bonded to six equivalent Ta(2) and six equivalent Co(1) atoms to form CoTa6Co6 cuboctahedra that share corners with twelve equivalent Co(1)Ta7Co5 cuboctahedra, edges with six equivalent Co(3)Ta6Co6 cuboctahedra, and faces with eighteen equivalent Co(1)Ta7Co5 cuboctahedra. is represented by the CIF card [CIF]
data_TaCo
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.895
_cell_length_b   4.895
_cell_length_c   17.509
_cell_angle_alpha   81.969
_cell_angle_beta   90.000
_cell_angle_gamma   119.998
_symmetry_Int_Tables_number   1
_cell_volume   358.543
_cell_formula_units_Z   13
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  0.173  0.347  0.480  1.0
  Ta  Ta1  1  0.671  0.342  0.986  1.0
  Ta  Ta2  1  0.329  0.658  0.014  1.0
  Ta  Ta3  1  0.827  0.653  0.520  1.0
  Ta  Ta4  1  0.226  0.452  0.323  1.0
  Ta  Ta5  1  0.724  0.448  0.828  1.0
  Ta  Ta6  1  0.276  0.552  0.172  1.0
  Ta  Ta7  1  0.774  0.548  0.677  1.0
  Ta  Ta8  1  0.584  0.167  0.249  1.0
  Ta  Ta9  1  0.082  0.165  0.753  1.0
  Ta  Ta10  1  0.918  0.835  0.247  1.0
  Ta  Ta11  1  0.416  0.833  0.751  1.0
  Ta  Ta12  1  0.500  0.000  0.500  1.0
  Co  Co13  1  0.797  0.090  0.113  1.0
  Co  Co14  1  0.289  0.092  0.619  1.0
  Co  Co15  1  0.293  0.090  0.113  1.0
  Co  Co16  1  0.802  0.092  0.619  1.0
  Co  Co17  1  0.797  0.594  0.113  1.0
  Co  Co18  1  0.289  0.579  0.619  1.0
  Co  Co19  1  0.711  0.908  0.381  1.0
  Co  Co20  1  0.203  0.910  0.887  1.0
  Co  Co21  1  0.198  0.908  0.381  1.0
  Co  Co22  1  0.707  0.910  0.887  1.0
  Co  Co23  1  0.711  0.421  0.381  1.0
  Co  Co24  1  0.203  0.406  0.887  1.0
  Co  Co25  1  0.000  0.000  0.000  1.0
[/CIF]
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