The crystal structure described by TaNi 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 Ni(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 Ni(3), and nine equivalent Ni(1) atoms. In the third Ta site, Ta(3) is bonded in a 14-coordinate geometry to one Ta(1), one Ta(4), three equivalent Ta(5), three equivalent Ta(6), and six equivalent Ni(2) atoms. In the fourth Ta site, Ta(4) is bonded in a 14-coordinate geometry to one Ta(2), one Ta(3), three equivalent Ta(5), three equivalent Ta(6), and six equivalent Ni(1) atoms. In the fifth Ta site, Ta(5) is bonded in a 6-coordinate geometry to three equivalent Ta(3), three equivalent Ta(4), three equivalent Ni(1), and three equivalent Ni(2) atoms. In the sixth Ta site, Ta(6) is bonded in a 6-coordinate geometry to three equivalent Ta(3), three equivalent Ta(4), three equivalent Ni(1), and three equivalent Ni(2) atoms. In the seventh Ta site, Ta(7) is bonded in a 6-coordinate geometry to six equivalent Ta(1) and six equivalent Ni(2) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Ta(5), one Ta(6), two equivalent Ta(4), three equivalent Ta(2), one Ni(3), and four equivalent Ni(1) atoms to form NiTa7Ni5 cuboctahedra that share corners with two equivalent Ni(3)Ta6Ni6 cuboctahedra, corners with four equivalent Ni(2)Ta8Ni4 cuboctahedra, corners with nine equivalent Ni(1)Ta7Ni5 cuboctahedra,  an edgeedge with one Ni(2)Ta8Ni4 cuboctahedra, edges with four equivalent Ni(1)Ta7Ni5 cuboctahedra, faces with three equivalent Ni(3)Ta6Ni6 cuboctahedra, and faces with ten equivalent Ni(1)Ta7Ni5 cuboctahedra. In the second Ni site, Ni(2) is bonded to one Ta(5), one Ta(6), one Ta(7), two equivalent Ta(3), three equivalent Ta(1), and four equivalent Ni(2) atoms to form distorted NiTa8Ni4 cuboctahedra that share corners with four equivalent Ni(1)Ta7Ni5 cuboctahedra, corners with nine equivalent Ni(2)Ta8Ni4 cuboctahedra,  an edgeedge with one Ni(1)Ta7Ni5 cuboctahedra, edges with four equivalent Ni(2)Ta8Ni4 cuboctahedra, and faces with ten equivalent Ni(2)Ta8Ni4 cuboctahedra. In the third Ni site, Ni(3) is bonded to six equivalent Ta(2) and six equivalent Ni(1) atoms to form NiTa6Ni6 cuboctahedra that share corners with twelve equivalent Ni(1)Ta7Ni5 cuboctahedra, edges with six equivalent Ni(3)Ta6Ni6 cuboctahedra, and faces with eighteen equivalent Ni(1)Ta7Ni5 cuboctahedra. is represented by the CIF file [CIF]
data_TaNi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.966
_cell_length_b   17.966
_cell_length_c   17.966
_cell_angle_alpha   15.641
_cell_angle_beta   15.641
_cell_angle_gamma   15.641
_symmetry_Int_Tables_number   1
_cell_volume   367.313
_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  0.827  0.827  0.827  1.0
  Ta  Ta1  1  0.327  0.327  0.327  1.0
  Ta  Ta2  1  0.673  0.673  0.673  1.0
  Ta  Ta3  1  0.173  0.173  0.173  1.0
  Ta  Ta4  1  0.774  0.774  0.774  1.0
  Ta  Ta5  1  0.275  0.275  0.275  1.0
  Ta  Ta6  1  0.725  0.725  0.725  1.0
  Ta  Ta7  1  0.226  0.226  0.226  1.0
  Ta  Ta8  1  0.416  0.416  0.416  1.0
  Ta  Ta9  1  0.917  0.917  0.917  1.0
  Ta  Ta10  1  0.083  0.083  0.083  1.0
  Ta  Ta11  1  0.584  0.584  0.584  1.0
  Ta  Ta12  1  0.500  0.500  0.500  1.0
  Ni  Ni13  1  0.704  0.205  0.205  1.0
  Ni  Ni14  1  0.200  0.709  0.709  1.0
  Ni  Ni15  1  0.205  0.704  0.205  1.0
  Ni  Ni16  1  0.709  0.200  0.709  1.0
  Ni  Ni17  1  0.205  0.205  0.704  1.0
  Ni  Ni18  1  0.709  0.709  0.200  1.0
  Ni  Ni19  1  0.800  0.291  0.291  1.0
  Ni  Ni20  1  0.296  0.795  0.795  1.0
  Ni  Ni21  1  0.291  0.800  0.291  1.0
  Ni  Ni22  1  0.795  0.296  0.795  1.0
  Ni  Ni23  1  0.291  0.291  0.800  1.0
  Ni  Ni24  1  0.795  0.795  0.296  1.0
  Ni  Ni25  1  0.000  0.000  0.000  1.0
[/CIF]
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The crystal structure described by TaNi 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 Ni(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 Ni(3), and nine equivalent Ni(1) atoms. In the third Ta site, Ta(3) is bonded in a 14-coordinate geometry to one Ta(1), one Ta(4), three equivalent Ta(5), three equivalent Ta(6), and six equivalent Ni(2) atoms. In the fourth Ta site, Ta(4) is bonded in a 14-coordinate geometry to one Ta(2), one Ta(3), three equivalent Ta(5), three equivalent Ta(6), and six equivalent Ni(1) atoms. In the fifth Ta site, Ta(5) is bonded in a 6-coordinate geometry to three equivalent Ta(3), three equivalent Ta(4), three equivalent Ni(1), and three equivalent Ni(2) atoms. In the sixth Ta site, Ta(6) is bonded in a 6-coordinate geometry to three equivalent Ta(3), three equivalent Ta(4), three equivalent Ni(1), and three equivalent Ni(2) atoms. In the seventh Ta site, Ta(7) is bonded in a 6-coordinate geometry to six equivalent Ta(1) and six equivalent Ni(2) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Ta(5), one Ta(6), two equivalent Ta(4), three equivalent Ta(2), one Ni(3), and four equivalent Ni(1) atoms to form NiTa7Ni5 cuboctahedra that share corners with two equivalent Ni(3)Ta6Ni6 cuboctahedra, corners with four equivalent Ni(2)Ta8Ni4 cuboctahedra, corners with nine equivalent Ni(1)Ta7Ni5 cuboctahedra,  an edgeedge with one Ni(2)Ta8Ni4 cuboctahedra, edges with four equivalent Ni(1)Ta7Ni5 cuboctahedra, faces with three equivalent Ni(3)Ta6Ni6 cuboctahedra, and faces with ten equivalent Ni(1)Ta7Ni5 cuboctahedra. In the second Ni site, Ni(2) is bonded to one Ta(5), one Ta(6), one Ta(7), two equivalent Ta(3), three equivalent Ta(1), and four equivalent Ni(2) atoms to form distorted NiTa8Ni4 cuboctahedra that share corners with four equivalent Ni(1)Ta7Ni5 cuboctahedra, corners with nine equivalent Ni(2)Ta8Ni4 cuboctahedra,  an edgeedge with one Ni(1)Ta7Ni5 cuboctahedra, edges with four equivalent Ni(2)Ta8Ni4 cuboctahedra, and faces with ten equivalent Ni(2)Ta8Ni4 cuboctahedra. In the third Ni site, Ni(3) is bonded to six equivalent Ta(2) and six equivalent Ni(1) atoms to form NiTa6Ni6 cuboctahedra that share corners with twelve equivalent Ni(1)Ta7Ni5 cuboctahedra, edges with six equivalent Ni(3)Ta6Ni6 cuboctahedra, and faces with eighteen equivalent Ni(1)Ta7Ni5 cuboctahedra. is represented by the CIF file [CIF]
data_TaNi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.966
_cell_length_b   17.966
_cell_length_c   17.966
_cell_angle_alpha   15.641
_cell_angle_beta   15.641
_cell_angle_gamma   15.641
_symmetry_Int_Tables_number   1
_cell_volume   367.313
_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  0.827  0.827  0.827  1.0
  Ta  Ta1  1  0.327  0.327  0.327  1.0
  Ta  Ta2  1  0.673  0.673  0.673  1.0
  Ta  Ta3  1  0.173  0.173  0.173  1.0
  Ta  Ta4  1  0.774  0.774  0.774  1.0
  Ta  Ta5  1  0.275  0.275  0.275  1.0
  Ta  Ta6  1  0.725  0.725  0.725  1.0
  Ta  Ta7  1  0.226  0.226  0.226  1.0
  Ta  Ta8  1  0.416  0.416  0.416  1.0
  Ta  Ta9  1  0.917  0.917  0.917  1.0
  Ta  Ta10  1  0.083  0.083  0.083  1.0
  Ta  Ta11  1  0.584  0.584  0.584  1.0
  Ta  Ta12  1  0.500  0.500  0.500  1.0
  Ni  Ni13  1  0.704  0.205  0.205  1.0
  Ni  Ni14  1  0.200  0.709  0.709  1.0
  Ni  Ni15  1  0.205  0.704  0.205  1.0
  Ni  Ni16  1  0.709  0.200  0.709  1.0
  Ni  Ni17  1  0.205  0.205  0.704  1.0
  Ni  Ni18  1  0.709  0.709  0.200  1.0
  Ni  Ni19  1  0.800  0.291  0.291  1.0
  Ni  Ni20  1  0.296  0.795  0.795  1.0
  Ni  Ni21  1  0.291  0.800  0.291  1.0
  Ni  Ni22  1  0.795  0.296  0.795  1.0
  Ni  Ni23  1  0.291  0.291  0.800  1.0
  Ni  Ni24  1  0.795  0.795  0.296  1.0
  Ni  Ni25  1  0.000  0.000  0.000  1.0
[/CIF]
.