data_CeAlTl2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.27
_cell_length_b   5.27
_cell_length_c   5.27
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CeAlTl2
_chemical_formula_sum   'Ce1 Al1 Tl2'
_cell_volume   103.76
_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
  Ce  Ce1  1  0.73  0.73  0.73  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0
  Tl  Tl2  1  0.86  0.86  0.86  1.0
  Tl  Tl3  1  0.59  0.59  0.59  1.0

data_CeAlTl2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.27
_cell_length_b   5.27
_cell_length_c   12.92
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   CeAlTl2
_chemical_formula_sum   'Ce3 Al3 Tl6'
_cell_volume   311.27
_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
  Ce  Ce0  3  0.0  0.0  0.27  1.0
  Al  Al1  3  0.0  0.0  -0.0  1.0
  Tl  Tl2  3  0.0  0.0  0.14  1.0
  Tl  Tl3  3  0.0  0.0  0.41  1.0

Ce Al Tl Tl
CeTl2Al crystallizes in the trigonal R3m space group. Ce(1) is bonded in a linear geometry to one Tl(1), one Tl(2), and three equivalent Al(1) atoms. The Ce(1)-Tl(1) bond length is 1.75 Å. The Ce(1)-Tl(2) bond length is 1.75 Å. All Ce(1)-Al(1) bond lengths are 3.15 Å. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a distorted linear geometry to one Ce(1) and one Al(1) atom. The Tl(1)-Al(1) bond length is 1.75 Å. In the second Tl site, Tl(2) is bonded in a single-bond geometry to one Ce(1) atom. Al(1) is bonded in a 4-coordinate geometry to three equivalent Ce(1) and one Tl(1) atom.