The structure described by Ta4(Ni3Cu)3 is beta Cu3Ti-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), two equivalent Ni(5), one Cu(2), and two equivalent Cu(1) atoms to form TaCu3Ni9 cuboctahedra that share corners with two equivalent Ta(1)Cu3Ni9 cuboctahedra, corners with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, corners with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, corners with four equivalent Ni(1)Ta4Ni8 cuboctahedra, corners with four equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with two equivalent Ta(3)Cu2Ni10 cuboctahedra, edges with two equivalent Ta(1)Cu3Ni9 cuboctahedra, edges with two equivalent Ta(2)Cu4Ni8 cuboctahedra, edges with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra,  a faceface with one Ni(1)Ta4Ni8 cuboctahedra,  a faceface with one Cu(2)Ta4Ni8 cuboctahedra, faces with two equivalent Ta(3)Cu2Ni10 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ta(2)Cu4Ni8 cuboctahedra, faces with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, and faces with four equivalent Cu(1)Ta4Ni8 cuboctahedra. In the second Ta site, Ta(2) is bonded to four equivalent Ni(3), four equivalent Ni(5), two equivalent Cu(1), and two equivalent Cu(2) atoms to form TaCu4Ni8 cuboctahedra that share corners with two equivalent Ta(3)Cu2Ni10 cuboctahedra, corners with eight equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, corners with eight equivalent Cu(1)Ta4Ni8 cuboctahedra, edges with two equivalent Ta(2)Cu4Ni8 cuboctahedra, edges with four equivalent Ta(1)Cu3Ni9 cuboctahedra, edges with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ta(2)Cu4Ni8 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with four equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, and faces with four equivalent Cu(2)Ta4Ni8 cuboctahedra. In the third Ta site, Ta(3) is bonded to two equivalent Ni(1), four equivalent Ni(2), four equivalent Ni(4), and two equivalent Cu(1) atoms to form TaCu2Ni10 cuboctahedra that share corners with two equivalent Ta(2)Cu4Ni8 cuboctahedra, corners with eight equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, corners with eight equivalent Cu(1)Ta4Ni8 cuboctahedra, edges with two equivalent Ta(3)Cu2Ni10 cuboctahedra, edges with four equivalent Ta(1)Cu3Ni9 cuboctahedra, edges with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ta(3)Cu2Ni10 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with four equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, and faces with four equivalent Ni(1)Ta4Ni8 cuboctahedra. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Ta(1), two equivalent Ta(3), four equivalent Ni(2), and four equivalent Ni(4) atoms to form distorted NiTa4Ni8 cuboctahedra that share corners with two equivalent Cu(2)Ta4Ni8 cuboctahedra, corners with eight equivalent Ta(1)Cu3Ni9 cuboctahedra, corners with eight equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(1)Ta4Ni8 cuboctahedra, edges with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with four equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ni(1)Ta4Ni8 cuboctahedra, faces with four equivalent Ta(3)Cu2Ni10 cuboctahedra, faces with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, and faces with four equivalent Cu(1)Ta4Ni8 cuboctahedra. In the second Ni site, Ni(2) is bonded to two equivalent Ta(1), two equivalent Ta(3), one Ni(2), one Ni(3), two equivalent Ni(1), two equivalent Ni(4), and two equivalent Cu(1) atoms to form distorted NiTa4Cu2Ni6 cuboctahedra that share corners with four equivalent Ta(1)Cu3Ni9 cuboctahedra, corners with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, corners with four equivalent Ni(1)Ta4Ni8 cuboctahedra, corners with six equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ta(3)Cu2Ni10 cuboctahedra, edges with two equivalent Ta(1)Cu3Ni9 cuboctahedra, edges with two equivalent Ta(2)Cu4Ni8 cuboctahedra, edges with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with four equivalent Cu(1)Ta4Ni8 cuboctahedra,  a faceface with one Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ta(3)Cu2Ni10 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ni(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with three equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, and faces with six equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra. In the third Ni site, Ni(3) is bonded to two equivalent Ta(1), two equivalent Ta(2), one Ni(2), one Ni(3), two equivalent Ni(5), two equivalent Cu(1), and two equivalent Cu(2) atoms to form distorted NiTa4Cu4Ni4 cuboctahedra that share corners with four equivalent Ta(1)Cu3Ni9 cuboctahedra, corners with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, corners with four equivalent Cu(2)Ta4Ni8 cuboctahedra, corners with six equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ta(3)Cu2Ni10 cuboctahedra, edges with two equivalent Ta(1)Cu3Ni9 cuboctahedra, edges with two equivalent Ta(2)Cu4Ni8 cuboctahedra, edges with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(1)Ta4Ni8 cuboctahedra, edges with four equivalent Cu(1)Ta4Ni8 cuboctahedra,  a faceface with one Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ta(2)Cu4Ni8 cuboctahedra, faces with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(2)Ta4Ni8 cuboctahedra, faces with three equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, and faces with six equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra. In the fourth Ni site, Ni(4) is bonded to two equivalent Ta(1), two equivalent Ta(3), one Ni(4), one Ni(5), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Cu(1) atoms to form distorted NiTa4Cu2Ni6 cuboctahedra that share corners with four equivalent Ta(3)Cu2Ni10 cuboctahedra, corners with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, corners with four equivalent Cu(1)Ta4Ni8 cuboctahedra, corners with six equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ta(2)Cu4Ni8 cuboctahedra, edges with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with four equivalent Ta(1)Cu3Ni9 cuboctahedra,  a faceface with one Ni(5)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ta(3)Cu2Ni10 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ni(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with three equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, and faces with six equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra. In the fifth Ni site, Ni(5) is bonded to two equivalent Ta(1), two equivalent Ta(2), one Ni(4), one Ni(5), two equivalent Ni(3), two equivalent Cu(1), and two equivalent Cu(2) atoms to form distorted NiTa4Cu4Ni4 cuboctahedra that share corners with four equivalent Ta(2)Cu4Ni8 cuboctahedra, corners with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, corners with four equivalent Cu(1)Ta4Ni8 cuboctahedra, corners with six equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ta(3)Cu2Ni10 cuboctahedra, edges with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with four equivalent Ta(1)Cu3Ni9 cuboctahedra,  a faceface with one Ni(4)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ta(2)Cu4Ni8 cuboctahedra, faces with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(2)Ta4Ni8 cuboctahedra, faces with three equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, and faces with six equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one Ta(2), one Ta(3), two equivalent Ta(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), and two equivalent Ni(5) atoms to form distorted CuTa4Ni8 cuboctahedra that share corners with two equivalent Cu(1)Ta4Ni8 cuboctahedra, corners with four equivalent Ta(3)Cu2Ni10 cuboctahedra, corners with four equivalent Ta(2)Cu4Ni8 cuboctahedra, corners with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, corners with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra,  a faceface with one Ta(3)Cu2Ni10 cuboctahedra,  a faceface with one Ta(2)Cu4Ni8 cuboctahedra, faces with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ni(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(2)Ta4Ni8 cuboctahedra, and faces with four equivalent Ta(1)Cu3Ni9 cuboctahedra. In the second Cu site, Cu(2) is bonded to two equivalent Ta(1), two equivalent Ta(2), four equivalent Ni(3), and four equivalent Ni(5) atoms to form CuTa4Ni8 cuboctahedra that share corners with two equivalent Ni(1)Ta4Ni8 cuboctahedra, corners with eight equivalent Ta(1)Cu3Ni9 cuboctahedra, corners with eight equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with four equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Cu(2)Ta4Ni8 cuboctahedra, faces with four equivalent Ta(2)Cu4Ni8 cuboctahedra, faces with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, and faces with four equivalent Cu(1)Ta4Ni8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ta4(CuNi3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.318
_cell_length_b   4.483
_cell_length_c   10.363
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   200.607
_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  0.500  0.662  0.255  1.0
  Ta  Ta1  1  0.500  0.662  0.745  1.0
  Ta  Ta2  1  0.000  0.336  0.000  1.0
  Ta  Ta3  1  0.000  0.350  0.500  1.0
  Cu  Cu4  1  0.000  0.313  0.250  1.0
  Cu  Cu5  1  0.000  0.313  0.750  1.0
  Cu  Cu6  1  0.500  0.687  0.000  1.0
  Ni  Ni7  1  0.500  0.676  0.500  1.0
  Ni  Ni8  1  0.500  0.165  0.377  1.0
  Ni  Ni9  1  0.500  0.168  0.875  1.0
  Ni  Ni10  1  0.500  0.168  0.125  1.0
  Ni  Ni11  1  0.500  0.165  0.623  1.0
  Ni  Ni12  1  0.000  0.837  0.375  1.0
  Ni  Ni13  1  0.000  0.830  0.873  1.0
  Ni  Ni14  1  0.000  0.830  0.127  1.0
  Ni  Ni15  1  0.000  0.837  0.625  1.0
[/CIF]
.
The structure described by Ta4(Ni3Cu)3 is beta Cu3Ti-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), two equivalent Ni(5), one Cu(2), and two equivalent Cu(1) atoms to form TaCu3Ni9 cuboctahedra that share corners with two equivalent Ta(1)Cu3Ni9 cuboctahedra, corners with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, corners with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, corners with four equivalent Ni(1)Ta4Ni8 cuboctahedra, corners with four equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with two equivalent Ta(3)Cu2Ni10 cuboctahedra, edges with two equivalent Ta(1)Cu3Ni9 cuboctahedra, edges with two equivalent Ta(2)Cu4Ni8 cuboctahedra, edges with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra,  a faceface with one Ni(1)Ta4Ni8 cuboctahedra,  a faceface with one Cu(2)Ta4Ni8 cuboctahedra, faces with two equivalent Ta(3)Cu2Ni10 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ta(2)Cu4Ni8 cuboctahedra, faces with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, and faces with four equivalent Cu(1)Ta4Ni8 cuboctahedra. In the second Ta site, Ta(2) is bonded to four equivalent Ni(3), four equivalent Ni(5), two equivalent Cu(1), and two equivalent Cu(2) atoms to form TaCu4Ni8 cuboctahedra that share corners with two equivalent Ta(3)Cu2Ni10 cuboctahedra, corners with eight equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, corners with eight equivalent Cu(1)Ta4Ni8 cuboctahedra, edges with two equivalent Ta(2)Cu4Ni8 cuboctahedra, edges with four equivalent Ta(1)Cu3Ni9 cuboctahedra, edges with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ta(2)Cu4Ni8 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with four equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, and faces with four equivalent Cu(2)Ta4Ni8 cuboctahedra. In the third Ta site, Ta(3) is bonded to two equivalent Ni(1), four equivalent Ni(2), four equivalent Ni(4), and two equivalent Cu(1) atoms to form TaCu2Ni10 cuboctahedra that share corners with two equivalent Ta(2)Cu4Ni8 cuboctahedra, corners with eight equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, corners with eight equivalent Cu(1)Ta4Ni8 cuboctahedra, edges with two equivalent Ta(3)Cu2Ni10 cuboctahedra, edges with four equivalent Ta(1)Cu3Ni9 cuboctahedra, edges with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ta(3)Cu2Ni10 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with four equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, and faces with four equivalent Ni(1)Ta4Ni8 cuboctahedra. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Ta(1), two equivalent Ta(3), four equivalent Ni(2), and four equivalent Ni(4) atoms to form distorted NiTa4Ni8 cuboctahedra that share corners with two equivalent Cu(2)Ta4Ni8 cuboctahedra, corners with eight equivalent Ta(1)Cu3Ni9 cuboctahedra, corners with eight equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(1)Ta4Ni8 cuboctahedra, edges with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with four equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ni(1)Ta4Ni8 cuboctahedra, faces with four equivalent Ta(3)Cu2Ni10 cuboctahedra, faces with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, and faces with four equivalent Cu(1)Ta4Ni8 cuboctahedra. In the second Ni site, Ni(2) is bonded to two equivalent Ta(1), two equivalent Ta(3), one Ni(2), one Ni(3), two equivalent Ni(1), two equivalent Ni(4), and two equivalent Cu(1) atoms to form distorted NiTa4Cu2Ni6 cuboctahedra that share corners with four equivalent Ta(1)Cu3Ni9 cuboctahedra, corners with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, corners with four equivalent Ni(1)Ta4Ni8 cuboctahedra, corners with six equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ta(3)Cu2Ni10 cuboctahedra, edges with two equivalent Ta(1)Cu3Ni9 cuboctahedra, edges with two equivalent Ta(2)Cu4Ni8 cuboctahedra, edges with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with four equivalent Cu(1)Ta4Ni8 cuboctahedra,  a faceface with one Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ta(3)Cu2Ni10 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ni(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with three equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, and faces with six equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra. In the third Ni site, Ni(3) is bonded to two equivalent Ta(1), two equivalent Ta(2), one Ni(2), one Ni(3), two equivalent Ni(5), two equivalent Cu(1), and two equivalent Cu(2) atoms to form distorted NiTa4Cu4Ni4 cuboctahedra that share corners with four equivalent Ta(1)Cu3Ni9 cuboctahedra, corners with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, corners with four equivalent Cu(2)Ta4Ni8 cuboctahedra, corners with six equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ta(3)Cu2Ni10 cuboctahedra, edges with two equivalent Ta(1)Cu3Ni9 cuboctahedra, edges with two equivalent Ta(2)Cu4Ni8 cuboctahedra, edges with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(1)Ta4Ni8 cuboctahedra, edges with four equivalent Cu(1)Ta4Ni8 cuboctahedra,  a faceface with one Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ta(2)Cu4Ni8 cuboctahedra, faces with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(2)Ta4Ni8 cuboctahedra, faces with three equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, and faces with six equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra. In the fourth Ni site, Ni(4) is bonded to two equivalent Ta(1), two equivalent Ta(3), one Ni(4), one Ni(5), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Cu(1) atoms to form distorted NiTa4Cu2Ni6 cuboctahedra that share corners with four equivalent Ta(3)Cu2Ni10 cuboctahedra, corners with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, corners with four equivalent Cu(1)Ta4Ni8 cuboctahedra, corners with six equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ta(2)Cu4Ni8 cuboctahedra, edges with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with four equivalent Ta(1)Cu3Ni9 cuboctahedra,  a faceface with one Ni(5)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ta(3)Cu2Ni10 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ni(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with three equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, and faces with six equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra. In the fifth Ni site, Ni(5) is bonded to two equivalent Ta(1), two equivalent Ta(2), one Ni(4), one Ni(5), two equivalent Ni(3), two equivalent Cu(1), and two equivalent Cu(2) atoms to form distorted NiTa4Cu4Ni4 cuboctahedra that share corners with four equivalent Ta(2)Cu4Ni8 cuboctahedra, corners with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, corners with four equivalent Cu(1)Ta4Ni8 cuboctahedra, corners with six equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ta(3)Cu2Ni10 cuboctahedra, edges with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with four equivalent Ta(1)Cu3Ni9 cuboctahedra,  a faceface with one Ni(4)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Ta(2)Cu4Ni8 cuboctahedra, faces with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(2)Ta4Ni8 cuboctahedra, faces with three equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, and faces with six equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one Ta(2), one Ta(3), two equivalent Ta(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), and two equivalent Ni(5) atoms to form distorted CuTa4Ni8 cuboctahedra that share corners with two equivalent Cu(1)Ta4Ni8 cuboctahedra, corners with four equivalent Ta(3)Cu2Ni10 cuboctahedra, corners with four equivalent Ta(2)Cu4Ni8 cuboctahedra, corners with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, corners with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Ni(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(1)Ta4Ni8 cuboctahedra, edges with two equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra,  a faceface with one Ta(3)Cu2Ni10 cuboctahedra,  a faceface with one Ta(2)Cu4Ni8 cuboctahedra, faces with two equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, faces with two equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, faces with two equivalent Ni(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with two equivalent Cu(2)Ta4Ni8 cuboctahedra, and faces with four equivalent Ta(1)Cu3Ni9 cuboctahedra. In the second Cu site, Cu(2) is bonded to two equivalent Ta(1), two equivalent Ta(2), four equivalent Ni(3), and four equivalent Ni(5) atoms to form CuTa4Ni8 cuboctahedra that share corners with two equivalent Ni(1)Ta4Ni8 cuboctahedra, corners with eight equivalent Ta(1)Cu3Ni9 cuboctahedra, corners with eight equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, edges with two equivalent Cu(2)Ta4Ni8 cuboctahedra, edges with four equivalent Ni(2)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(4)Ta4Cu2Ni6 cuboctahedra, edges with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, edges with four equivalent Cu(1)Ta4Ni8 cuboctahedra, faces with two equivalent Ta(1)Cu3Ni9 cuboctahedra, faces with two equivalent Cu(2)Ta4Ni8 cuboctahedra, faces with four equivalent Ta(2)Cu4Ni8 cuboctahedra, faces with four equivalent Ni(3)Ta4Cu4Ni4 cuboctahedra, faces with four equivalent Ni(5)Ta4Cu4Ni4 cuboctahedra, and faces with four equivalent Cu(1)Ta4Ni8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ta4(CuNi3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.318
_cell_length_b   4.483
_cell_length_c   10.363
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   200.607
_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  0.500  0.662  0.255  1.0
  Ta  Ta1  1  0.500  0.662  0.745  1.0
  Ta  Ta2  1  0.000  0.336  0.000  1.0
  Ta  Ta3  1  0.000  0.350  0.500  1.0
  Cu  Cu4  1  0.000  0.313  0.250  1.0
  Cu  Cu5  1  0.000  0.313  0.750  1.0
  Cu  Cu6  1  0.500  0.687  0.000  1.0
  Ni  Ni7  1  0.500  0.676  0.500  1.0
  Ni  Ni8  1  0.500  0.165  0.377  1.0
  Ni  Ni9  1  0.500  0.168  0.875  1.0
  Ni  Ni10  1  0.500  0.168  0.125  1.0
  Ni  Ni11  1  0.500  0.165  0.623  1.0
  Ni  Ni12  1  0.000  0.837  0.375  1.0
  Ni  Ni13  1  0.000  0.830  0.873  1.0
  Ni  Ni14  1  0.000  0.830  0.127  1.0
  Ni  Ni15  1  0.000  0.837  0.625  1.0
[/CIF]
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