data_TbEr3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.96
_cell_length_b   4.96
_cell_length_c   4.96
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TbEr3
_chemical_formula_sum   'Tb1 Er3'
_cell_volume   122.03
_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
  Er  Er0  1  0.48  0.48  0.0  1.0
  Er  Er1  1  0.48  0.0  0.48  1.0
  Er  Er2  1  0.0  0.48  0.48  1.0

data_TbEr3
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.01
_cell_length_b   7.01
_cell_length_c   8.59
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   TbEr3
_chemical_formula_sum   'Tb3 Er9'
_cell_volume   366.09
_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
  Er  Er1  9  0.01  0.51  0.99  1.0

Tb Er Er Er
Er3Tb is Uranium Silicide structured and crystallizes in the trigonal R3m space group. Er(1) is bonded to eight equivalent Er(1) and four equivalent Tb(1) atoms to form distorted ErTb4Er8 cuboctahedra that share corners with twelve equivalent Er(1)Tb4Er8 cuboctahedra, edges with eight equivalent Tb(1)Er12 cuboctahedra, edges with sixteen equivalent Er(1)Tb4Er8 cuboctahedra, faces with four equivalent Tb(1)Er12 cuboctahedra, and faces with fourteen equivalent Er(1)Tb4Er8 cuboctahedra. There are a spread of Er(1)-Er(1) bond distances ranging from 3.37-3.65 Å. There are a spread of Er(1)-Tb(1) bond distances ranging from 3.37-3.65 Å. Tb(1) is bonded to twelve equivalent Er(1) atoms to form TbEr12 cuboctahedra that share corners with twelve equivalent Tb(1)Er12 cuboctahedra, edges with twenty-four equivalent Er(1)Tb4Er8 cuboctahedra, faces with six equivalent Tb(1)Er12 cuboctahedra, and faces with twelve equivalent Er(1)Tb4Er8 cuboctahedra.