The compound described by Tb8CoGa3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to one Co(1) and four equivalent Ga(1) atoms to form distorted TbGa4Co trigonal pyramids that share corners with two equivalent Tb(4)Ga6 octahedra, corners with three equivalent Tb(2)Ga3Co tetrahedra, corners with six equivalent Tb(1)Ga4Co trigonal pyramids,  an edgeedge with one Tb(2)Ga3Co tetrahedra, edges with four equivalent Tb(1)Ga4Co trigonal pyramids, and faces with two equivalent Tb(4)Ga6 octahedra. The corner-sharing octahedral tilt angles range from 54-58°. In the second Tb site, Tb(2) is bonded to one Co(1) and three equivalent Ga(1) atoms to form distorted TbGa3Co tetrahedra that share corners with six equivalent Tb(4)Ga6 octahedra, corners with nine equivalent Tb(1)Ga4Co trigonal pyramids, and edges with three equivalent Tb(1)Ga4Co trigonal pyramids. The corner-sharing octahedral tilt angles range from 16-47°. In the third Tb site, Tb(3) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent Ga(1) atoms. In the fourth Tb site, Tb(4) is bonded to six equivalent Ga(1) atoms to form distorted TbGa6 octahedra that share corners with six equivalent Tb(2)Ga3Co tetrahedra, corners with six equivalent Tb(1)Ga4Co trigonal pyramids, faces with two equivalent Tb(4)Ga6 octahedra, and faces with six equivalent Tb(1)Ga4Co trigonal pyramids. Co(1) is bonded in a 7-coordinate geometry to one Tb(2), three equivalent Tb(1), and three equivalent Tb(3) atoms. Ga(1) is bonded in a 11-coordinate geometry to one Tb(2), two equivalent Tb(4), four equivalent Tb(1), and four equivalent Tb(3) atoms. is represented by the CIF file [CIF]
data_Tb8Ga3Co
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.082
_cell_length_b   10.082
_cell_length_c   6.942
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   611.154
_cell_formula_units_Z   2
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
  Tb  Tb0  1  0.828  0.655  0.490  1.0
  Tb  Tb1  1  0.345  0.172  0.490  1.0
  Tb  Tb2  1  0.828  0.172  0.490  1.0
  Tb  Tb3  1  0.172  0.345  0.990  1.0
  Tb  Tb4  1  0.655  0.828  0.990  1.0
  Tb  Tb5  1  0.172  0.828  0.990  1.0
  Tb  Tb6  1  0.667  0.333  0.172  1.0
  Tb  Tb7  1  0.333  0.667  0.672  1.0
  Tb  Tb8  1  0.537  0.073  0.792  1.0
  Tb  Tb9  1  0.927  0.463  0.792  1.0
  Tb  Tb10  1  0.537  0.463  0.792  1.0
  Tb  Tb11  1  0.463  0.927  0.292  1.0
  Tb  Tb12  1  0.073  0.537  0.292  1.0
  Tb  Tb13  1  0.463  0.537  0.292  1.0
  Tb  Tb14  1  0.000  0.000  0.770  1.0
  Tb  Tb15  1  0.000  0.000  0.270  1.0
  Ga  Ga16  1  0.836  0.673  0.040  1.0
  Ga  Ga17  1  0.327  0.164  0.040  1.0
  Ga  Ga18  1  0.836  0.164  0.040  1.0
  Ga  Ga19  1  0.164  0.327  0.540  1.0
  Ga  Ga20  1  0.673  0.836  0.540  1.0
  Ga  Ga21  1  0.164  0.836  0.540  1.0
  Co  Co22  1  0.667  0.333  0.555  1.0
  Co  Co23  1  0.333  0.667  0.055  1.0
[/CIF]
.
The compound described by Tb8CoGa3 crystallizes in the hexagonal P6_3mc space group. There are four inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to one Co(1) and four equivalent Ga(1) atoms to form distorted TbGa4Co trigonal pyramids that share corners with two equivalent Tb(4)Ga6 octahedra, corners with three equivalent Tb(2)Ga3Co tetrahedra, corners with six equivalent Tb(1)Ga4Co trigonal pyramids,  an edgeedge with one Tb(2)Ga3Co tetrahedra, edges with four equivalent Tb(1)Ga4Co trigonal pyramids, and faces with two equivalent Tb(4)Ga6 octahedra. The corner-sharing octahedral tilt angles range from 54-58°. In the second Tb site, Tb(2) is bonded to one Co(1) and three equivalent Ga(1) atoms to form distorted TbGa3Co tetrahedra that share corners with six equivalent Tb(4)Ga6 octahedra, corners with nine equivalent Tb(1)Ga4Co trigonal pyramids, and edges with three equivalent Tb(1)Ga4Co trigonal pyramids. The corner-sharing octahedral tilt angles range from 16-47°. In the third Tb site, Tb(3) is bonded in a 3-coordinate geometry to one Co(1) and four equivalent Ga(1) atoms. In the fourth Tb site, Tb(4) is bonded to six equivalent Ga(1) atoms to form distorted TbGa6 octahedra that share corners with six equivalent Tb(2)Ga3Co tetrahedra, corners with six equivalent Tb(1)Ga4Co trigonal pyramids, faces with two equivalent Tb(4)Ga6 octahedra, and faces with six equivalent Tb(1)Ga4Co trigonal pyramids. Co(1) is bonded in a 7-coordinate geometry to one Tb(2), three equivalent Tb(1), and three equivalent Tb(3) atoms. Ga(1) is bonded in a 11-coordinate geometry to one Tb(2), two equivalent Tb(4), four equivalent Tb(1), and four equivalent Tb(3) atoms. is represented by the CIF file [CIF]
data_Tb8Ga3Co
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.082
_cell_length_b   10.082
_cell_length_c   6.942
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   611.154
_cell_formula_units_Z   2
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
  Tb  Tb0  1  0.828  0.655  0.490  1.0
  Tb  Tb1  1  0.345  0.172  0.490  1.0
  Tb  Tb2  1  0.828  0.172  0.490  1.0
  Tb  Tb3  1  0.172  0.345  0.990  1.0
  Tb  Tb4  1  0.655  0.828  0.990  1.0
  Tb  Tb5  1  0.172  0.828  0.990  1.0
  Tb  Tb6  1  0.667  0.333  0.172  1.0
  Tb  Tb7  1  0.333  0.667  0.672  1.0
  Tb  Tb8  1  0.537  0.073  0.792  1.0
  Tb  Tb9  1  0.927  0.463  0.792  1.0
  Tb  Tb10  1  0.537  0.463  0.792  1.0
  Tb  Tb11  1  0.463  0.927  0.292  1.0
  Tb  Tb12  1  0.073  0.537  0.292  1.0
  Tb  Tb13  1  0.463  0.537  0.292  1.0
  Tb  Tb14  1  0.000  0.000  0.770  1.0
  Tb  Tb15  1  0.000  0.000  0.270  1.0
  Ga  Ga16  1  0.836  0.673  0.040  1.0
  Ga  Ga17  1  0.327  0.164  0.040  1.0
  Ga  Ga18  1  0.836  0.164  0.040  1.0
  Ga  Ga19  1  0.164  0.327  0.540  1.0
  Ga  Ga20  1  0.673  0.836  0.540  1.0
  Ga  Ga21  1  0.164  0.836  0.540  1.0
  Co  Co22  1  0.667  0.333  0.555  1.0
  Co  Co23  1  0.333  0.667  0.055  1.0
[/CIF]
.