The crystal structure described by Tb(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. Tb(1) is bonded in a 20-coordinate geometry to eight equivalent Cu(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Cu(1) is bonded to two equivalent Tb(1), two equivalent Cu(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted edge, face, and corner-sharing CuTb2Al8Cu2 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Tb(1), four equivalent Cu(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Tb(1), four equivalent Cu(1), two equivalent Al(2), and four equivalent Al(1) atoms. is represented by the CIF card [CIF]
data_Tb(Al2Cu)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.682
_cell_length_b   6.682
_cell_length_c   6.682
_cell_angle_alpha   98.339
_cell_angle_beta   98.339
_cell_angle_gamma   135.229
_symmetry_Int_Tables_number   1
_cell_volume   194.256
_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  0.000  0.000  0.000  1.0
  Al  Al1  1  0.000  0.348  0.348  1.0
  Al  Al2  1  0.000  0.652  0.652  1.0
  Al  Al3  1  0.652  0.000  0.652  1.0
  Al  Al4  1  0.348  0.000  0.348  1.0
  Al  Al5  1  0.500  0.281  0.781  1.0
  Al  Al6  1  0.500  0.719  0.219  1.0
  Al  Al7  1  0.719  0.500  0.219  1.0
  Al  Al8  1  0.281  0.500  0.781  1.0
  Cu  Cu9  1  0.000  0.000  0.500  1.0
  Cu  Cu10  1  0.500  0.500  0.500  1.0
  Cu  Cu11  1  0.500  0.000  0.000  1.0
  Cu  Cu12  1  0.000  0.500  0.000  1.0
[/CIF]
.
The crystal structure described by Tb(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. Tb(1) is bonded in a 20-coordinate geometry to eight equivalent Cu(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Cu(1) is bonded to two equivalent Tb(1), two equivalent Cu(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted edge, face, and corner-sharing CuTb2Al8Cu2 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Tb(1), four equivalent Cu(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Tb(1), four equivalent Cu(1), two equivalent Al(2), and four equivalent Al(1) atoms. is represented by the CIF card [CIF]
data_Tb(Al2Cu)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.682
_cell_length_b   6.682
_cell_length_c   6.682
_cell_angle_alpha   98.339
_cell_angle_beta   98.339
_cell_angle_gamma   135.229
_symmetry_Int_Tables_number   1
_cell_volume   194.256
_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  0.000  0.000  0.000  1.0
  Al  Al1  1  0.000  0.348  0.348  1.0
  Al  Al2  1  0.000  0.652  0.652  1.0
  Al  Al3  1  0.652  0.000  0.652  1.0
  Al  Al4  1  0.348  0.000  0.348  1.0
  Al  Al5  1  0.500  0.281  0.781  1.0
  Al  Al6  1  0.500  0.719  0.219  1.0
  Al  Al7  1  0.719  0.500  0.219  1.0
  Al  Al8  1  0.281  0.500  0.781  1.0
  Cu  Cu9  1  0.000  0.000  0.500  1.0
  Cu  Cu10  1  0.500  0.500  0.500  1.0
  Cu  Cu11  1  0.500  0.000  0.000  1.0
  Cu  Cu12  1  0.000  0.500  0.000  1.0
[/CIF]
.