The structure described by TaCrNi crystallizes in the orthorhombic Amm2 space group. There are six inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 16-coordinate geometry to one Ta(1); three Ta(2,2); three equivalent Cr(1); four equivalent Cr(2); one Ni(3); two equivalent Ni(1); and two equivalent Ni(2) atoms. In the second Ta site, Ta(2) is bonded in a 16-coordinate geometry to one Ta(2), three equivalent Ta(1), two equivalent Cr(2), three equivalent Cr(1), one Ni(1), two equivalent Ni(3), and four equivalent Ni(2) atoms. In the third Ta site, Ta(2) is bonded in a 16-coordinate geometry to one Ta(2); three Ta(1,1); two equivalent Cr(2); three equivalent Cr(1); one Ni(1); two equivalent Ni(3); and four equivalent Ni(2) atoms. In the fourth Ta site, Ta(1) is bonded in a 16-coordinate geometry to one Ta(1); three Ta(2,2); three equivalent Cr(1); four equivalent Cr(2); one Ni(3); two equivalent Ni(1); and two equivalent Ni(2) atoms. In the fifth Ta site, Ta(2) is bonded in a 16-coordinate geometry to one Ta(2), three equivalent Ta(1), two equivalent Cr(2), three equivalent Cr(1), one Ni(1), two equivalent Ni(3), and four equivalent Ni(2) atoms. In the sixth Ta site, Ta(1) is bonded in a 16-coordinate geometry to one Ta(1); three Ta(2,2); three equivalent Cr(1); four equivalent Cr(2); one Ni(3); two equivalent Ni(1); and two equivalent Ni(2) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to three equivalent Ta(1); three Ta(2,2); two equivalent Cr(2); one Ni(1); one Ni(3); and two equivalent Ni(2) atoms to form distorted CrTa6Cr2Ni4 cuboctahedra that share corners with two equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, corners with two equivalent Ni(1)Ta6Cr6 cuboctahedra, corners with four equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, corners with four equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, edges with six equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, faces with two equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, faces with three equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, faces with three equivalent Ni(1)Ta6Cr6 cuboctahedra, faces with six equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, and faces with six equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra. In the second Cr site, Cr(2) is bonded to two Ta(2,2); four Ta(1,1,1); two equivalent Cr(1); two equivalent Cr(2); and two equivalent Ni(1) atoms to form distorted CrTa6Cr4Ni2 cuboctahedra that share corners with four equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, corners with four equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, corners with six equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, edges with two equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, edges with four equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, faces with two equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, faces with two equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, faces with four equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, faces with four equivalent Ni(1)Ta6Cr6 cuboctahedra, and faces with six equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two Ta(2,2); four Ta(1,1); two equivalent Cr(1); and four equivalent Cr(2) atoms to form NiTa6Cr6 cuboctahedra that share corners with two equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Ni(1)Ta6Cr6 cuboctahedra, corners with eight equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, edges with two equivalent Ni(1)Ta6Cr6 cuboctahedra, edges with four equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, faces with four equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, faces with six equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, and faces with eight equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra. In the second Ni site, Ni(2) is bonded to two Ta(1,1); four Ta(2,2,2); two equivalent Cr(1); two equivalent Ni(2); and two equivalent Ni(3) atoms to form distorted NiTa6Cr2Ni4 cuboctahedra that share corners with four equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Ni(1)Ta6Cr6 cuboctahedra, corners with six equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, edges with two equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, edges with four equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, faces with two equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, faces with two equivalent Ni(1)Ta6Cr6 cuboctahedra, faces with four equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, faces with four equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, and faces with six equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra. In the third Ni site, Ni(3) is bonded to two Ta(1,1); four Ta(2,2); two equivalent Cr(1); and four equivalent Ni(2) atoms to form distorted NiTa6Cr2Ni4 cuboctahedra that share corners with two equivalent Ni(1)Ta6Cr6 cuboctahedra, corners with four equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, corners with eight equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, edges with two equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, edges with four equivalent Ni(1)Ta6Cr6 cuboctahedra, faces with four equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, faces with six equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, and faces with eight equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra. is represented by the CIF card [CIF]
data_TaCrNi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.912
_cell_length_b   4.912
_cell_length_c   7.878
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   121.552
_symmetry_Int_Tables_number   1
_cell_volume   161.943
_cell_formula_units_Z   4
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  0.336  0.664  0.188  1.0
  Ta  Ta1  1  0.664  0.336  0.312  1.0
  Ta  Ta2  1  0.664  0.336  0.688  1.0
  Ta  Ta3  1  0.336  0.664  0.812  1.0
  Cr  Cr4  1  0.002  0.998  0.249  1.0
  Cr  Cr5  1  0.002  0.998  0.751  1.0
  Cr  Cr6  1  0.832  0.666  0.000  1.0
  Cr  Cr7  1  0.334  0.168  0.000  1.0
  Ni  Ni8  1  0.827  0.173  0.000  1.0
  Ni  Ni9  1  0.170  0.336  0.500  1.0
  Ni  Ni10  1  0.664  0.830  0.500  1.0
  Ni  Ni11  1  0.169  0.831  0.500  1.0
[/CIF]
.
The structure described by TaCrNi crystallizes in the orthorhombic Amm2 space group. There are six inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 16-coordinate geometry to one Ta(1); three Ta(2,2); three equivalent Cr(1); four equivalent Cr(2); one Ni(3); two equivalent Ni(1); and two equivalent Ni(2) atoms. In the second Ta site, Ta(2) is bonded in a 16-coordinate geometry to one Ta(2), three equivalent Ta(1), two equivalent Cr(2), three equivalent Cr(1), one Ni(1), two equivalent Ni(3), and four equivalent Ni(2) atoms. In the third Ta site, Ta(2) is bonded in a 16-coordinate geometry to one Ta(2); three Ta(1,1); two equivalent Cr(2); three equivalent Cr(1); one Ni(1); two equivalent Ni(3); and four equivalent Ni(2) atoms. In the fourth Ta site, Ta(1) is bonded in a 16-coordinate geometry to one Ta(1); three Ta(2,2); three equivalent Cr(1); four equivalent Cr(2); one Ni(3); two equivalent Ni(1); and two equivalent Ni(2) atoms. In the fifth Ta site, Ta(2) is bonded in a 16-coordinate geometry to one Ta(2), three equivalent Ta(1), two equivalent Cr(2), three equivalent Cr(1), one Ni(1), two equivalent Ni(3), and four equivalent Ni(2) atoms. In the sixth Ta site, Ta(1) is bonded in a 16-coordinate geometry to one Ta(1); three Ta(2,2); three equivalent Cr(1); four equivalent Cr(2); one Ni(3); two equivalent Ni(1); and two equivalent Ni(2) atoms. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to three equivalent Ta(1); three Ta(2,2); two equivalent Cr(2); one Ni(1); one Ni(3); and two equivalent Ni(2) atoms to form distorted CrTa6Cr2Ni4 cuboctahedra that share corners with two equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, corners with two equivalent Ni(1)Ta6Cr6 cuboctahedra, corners with four equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, corners with four equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, edges with six equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, faces with two equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, faces with three equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, faces with three equivalent Ni(1)Ta6Cr6 cuboctahedra, faces with six equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, and faces with six equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra. In the second Cr site, Cr(2) is bonded to two Ta(2,2); four Ta(1,1,1); two equivalent Cr(1); two equivalent Cr(2); and two equivalent Ni(1) atoms to form distorted CrTa6Cr4Ni2 cuboctahedra that share corners with four equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, corners with four equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, corners with six equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, edges with two equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, edges with four equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, faces with two equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, faces with two equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, faces with four equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, faces with four equivalent Ni(1)Ta6Cr6 cuboctahedra, and faces with six equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two Ta(2,2); four Ta(1,1); two equivalent Cr(1); and four equivalent Cr(2) atoms to form NiTa6Cr6 cuboctahedra that share corners with two equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Ni(1)Ta6Cr6 cuboctahedra, corners with eight equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, edges with two equivalent Ni(1)Ta6Cr6 cuboctahedra, edges with four equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, faces with four equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, faces with six equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, and faces with eight equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra. In the second Ni site, Ni(2) is bonded to two Ta(1,1); four Ta(2,2,2); two equivalent Cr(1); two equivalent Ni(2); and two equivalent Ni(3) atoms to form distorted NiTa6Cr2Ni4 cuboctahedra that share corners with four equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Ni(1)Ta6Cr6 cuboctahedra, corners with six equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, edges with two equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, edges with four equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, faces with two equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, faces with two equivalent Ni(1)Ta6Cr6 cuboctahedra, faces with four equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra, faces with four equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, and faces with six equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra. In the third Ni site, Ni(3) is bonded to two Ta(1,1); four Ta(2,2); two equivalent Cr(1); and four equivalent Ni(2) atoms to form distorted NiTa6Cr2Ni4 cuboctahedra that share corners with two equivalent Ni(1)Ta6Cr6 cuboctahedra, corners with four equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, corners with four equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, corners with eight equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, edges with two equivalent Ni(3)Ta6Cr2Ni4 cuboctahedra, edges with four equivalent Ni(1)Ta6Cr6 cuboctahedra, faces with four equivalent Cr(2)Ta6Cr4Ni2 cuboctahedra, faces with six equivalent Cr(1)Ta6Cr2Ni4 cuboctahedra, and faces with eight equivalent Ni(2)Ta6Cr2Ni4 cuboctahedra. is represented by the CIF card [CIF]
data_TaCrNi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.912
_cell_length_b   4.912
_cell_length_c   7.878
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   121.552
_symmetry_Int_Tables_number   1
_cell_volume   161.943
_cell_formula_units_Z   4
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  0.336  0.664  0.188  1.0
  Ta  Ta1  1  0.664  0.336  0.312  1.0
  Ta  Ta2  1  0.664  0.336  0.688  1.0
  Ta  Ta3  1  0.336  0.664  0.812  1.0
  Cr  Cr4  1  0.002  0.998  0.249  1.0
  Cr  Cr5  1  0.002  0.998  0.751  1.0
  Cr  Cr6  1  0.832  0.666  0.000  1.0
  Cr  Cr7  1  0.334  0.168  0.000  1.0
  Ni  Ni8  1  0.827  0.173  0.000  1.0
  Ni  Ni9  1  0.170  0.336  0.500  1.0
  Ni  Ni10  1  0.664  0.830  0.500  1.0
  Ni  Ni11  1  0.169  0.831  0.500  1.0
[/CIF]
.