data_TbY3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.05
_cell_length_b   5.05
_cell_length_c   5.05
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TbY3
_chemical_formula_sum   'Tb1 Y3'
_cell_volume   129.05
_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  Tb0  1  0.0  0.0  0.0  1.0
  Y  Y1  1  0.0  0.53  0.53  1.0
  Y  Y2  1  0.53  0.0  0.53  1.0
  Y  Y3  1  0.53  0.53  0.0  1.0

data_TbY3
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.15
_cell_length_b   7.15
_cell_length_c   8.75
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   TbY3
_chemical_formula_sum   'Tb3 Y9'
_cell_volume   387.14
_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
  Y  Y1  9  0.18  0.82  0.35  1.0

Tb Y Y Y
TbY3 is Uranium Silicide structured and crystallizes in the trigonal R3m space group. Tb(1) is bonded to twelve equivalent Y(1) atoms to form TbY12 cuboctahedra that share corners with twelve equivalent Tb(1)Y12 cuboctahedra, edges with twenty-four equivalent Y(1)Tb4Y8 cuboctahedra, faces with six equivalent Tb(1)Y12 cuboctahedra, and faces with twelve equivalent Y(1)Tb4Y8 cuboctahedra. There are a spread of Tb(1)-Y(1) bond distances ranging from 3.38-3.76 Å. Y(1) is bonded to four equivalent Tb(1) and eight equivalent Y(1) atoms to form distorted YTb4Y8 cuboctahedra that share corners with twelve equivalent Y(1)Tb4Y8 cuboctahedra, edges with eight equivalent Tb(1)Y12 cuboctahedra, edges with sixteen equivalent Y(1)Tb4Y8 cuboctahedra, faces with four equivalent Tb(1)Y12 cuboctahedra, and faces with fourteen equivalent Y(1)Tb4Y8 cuboctahedra. There are a spread of Y(1)-Y(1) bond distances ranging from 3.38-3.76 Å.