data_TbGa2Bi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   5.17
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TbGa2Bi
_chemical_formula_sum   'Tb1 Ga2 Bi1'
_cell_volume   97.77
_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
  Tb  Tb3  1  0.0  0.0  0.0  1.0
  Ga  Ga1  1  0.83  0.83  0.83  1.0
  Ga  Ga2  1  0.48  0.48  0.48  1.0
  Bi  Bi0  1  0.66  0.66  0.66  1.0

data_TbGa2Bi
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   12.67
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   TbGa2Bi
_chemical_formula_sum   'Tb3 Ga6 Bi3'
_cell_volume   293.31
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  3  0.0  0.0  0.0  1.0
  Ga  Ga1  3  0.0  0.0  0.17  1.0
  Ga  Ga2  3  0.0  0.0  0.52  1.0
  Bi  Bi3  3  0.0  0.0  0.34  1.0

Tb Ga Ga Bi
Tb Ga Ga Bi 0 1 - - - 1 3 o o o 2 3 o o o 
TbGa2Bi crystallizes in the trigonal R3m space group. Tb(1) is bonded in a 1-coordinate geometry to one Ga(1) and three equivalent Bi(1) atoms. The Tb(1)-Ga(1) bond length is 2.18 Å. All Tb(1)-Bi(1) bond lengths are 2.99 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a linear geometry to one Tb(1) and one Bi(1) atom. The Ga(1)-Bi(1) bond length is 2.18 Å. In the second Ga site, Ga(2) is bonded in a distorted single-bond geometry to one Bi(1) atom. The Ga(2)-Bi(1) bond length is 2.18 Å. Bi(1) is bonded to three equivalent Tb(1), one Ga(1), and one Ga(2) atom to form corner-sharing BiTb3Ga2 trigonal bipyramids.