The crystal structure described by La2(TlPb)3 crystallizes in the orthorhombic Pmmm space group. La(1) is bonded to two equivalent Tl(1), two equivalent Tl(2), two equivalent Tl(3), two equivalent Pb(2), and four equivalent Pb(1) atoms to form LaTl6Pb6 cuboctahedra that share corners with four equivalent Pb(2)La4Tl4 cuboctahedra, corners with four equivalent Pb(1)La4Tl6 cuboctahedra, corners with twelve equivalent La(1)Tl6Pb6 cuboctahedra, edges with two equivalent Pb(2)La4Tl4 cuboctahedra, edges with four equivalent Tl(2)La4Pb8 cuboctahedra, edges with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, edges with four equivalent Tl(3)La4Tl4Pb4 cuboctahedra, edges with four equivalent Pb(1)La4Tl6 cuboctahedra, faces with two equivalent Tl(2)La4Pb8 cuboctahedra, faces with two equivalent Tl(1)La4Tl4Pb4 cuboctahedra, faces with two equivalent Tl(3)La4Tl4Pb4 cuboctahedra, faces with four equivalent Pb(1)La4Tl6 cuboctahedra, and faces with six equivalent La(1)Tl6Pb6 cuboctahedra. There are three inequivalent Tl sites. In the first Tl site, Tl(1) is bonded to four equivalent La(1), four equivalent Tl(3), and four equivalent Pb(1) atoms to form distorted TlLa4Tl4Pb4 cuboctahedra that share corners with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, corners with four equivalent Pb(2)La4Tl4 cuboctahedra, edges with two equivalent Pb(2)La4Tl4 cuboctahedra, edges with eight equivalent La(1)Tl6Pb6 cuboctahedra, edges with eight equivalent Tl(2)La4Pb8 cuboctahedra, edges with eight equivalent Pb(1)La4Tl6 cuboctahedra, faces with four equivalent La(1)Tl6Pb6 cuboctahedra, faces with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, faces with four equivalent Tl(3)La4Tl4Pb4 cuboctahedra, and faces with four equivalent Pb(1)La4Tl6 cuboctahedra. In the second Tl site, Tl(2) is bonded to four equivalent La(1), four equivalent Pb(1), and four equivalent Pb(2) atoms to form TlLa4Pb8 cuboctahedra that share corners with four equivalent Tl(2)La4Pb8 cuboctahedra, corners with eight equivalent Tl(3)La4Tl4Pb4 cuboctahedra, corners with eight equivalent Pb(1)La4Tl6 cuboctahedra, edges with four equivalent Pb(2)La4Tl4 cuboctahedra, edges with four equivalent Pb(1)La4Tl6 cuboctahedra, edges with eight equivalent La(1)Tl6Pb6 cuboctahedra, edges with eight equivalent Tl(1)La4Tl4Pb4 cuboctahedra, faces with two equivalent Tl(3)La4Tl4Pb4 cuboctahedra, faces with four equivalent La(1)Tl6Pb6 cuboctahedra, and faces with four equivalent Tl(2)La4Pb8 cuboctahedra. In the third Tl site, Tl(3) is bonded to four equivalent La(1), four equivalent Tl(1), and four equivalent Pb(1) atoms to form distorted TlLa4Tl4Pb4 cuboctahedra that share corners with four equivalent Tl(3)La4Tl4Pb4 cuboctahedra, corners with eight equivalent Tl(2)La4Pb8 cuboctahedra, corners with eight equivalent Pb(2)La4Tl4 cuboctahedra, edges with eight equivalent La(1)Tl6Pb6 cuboctahedra, edges with eight equivalent Pb(1)La4Tl6 cuboctahedra, faces with two equivalent Tl(2)La4Pb8 cuboctahedra, faces with four equivalent La(1)Tl6Pb6 cuboctahedra, faces with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, faces with four equivalent Tl(3)La4Tl4Pb4 cuboctahedra, and faces with four equivalent Pb(1)La4Tl6 cuboctahedra. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to four equivalent La(1), two equivalent Tl(1), two equivalent Tl(2), and two equivalent Tl(3) atoms to form distorted PbLa4Tl6 cuboctahedra that share corners with four equivalent La(1)Tl6Pb6 cuboctahedra, corners with four equivalent Tl(2)La4Pb8 cuboctahedra, corners with ten equivalent Pb(1)La4Tl6 cuboctahedra,  an edgeedge with one Pb(1)La4Tl6 cuboctahedra, edges with two equivalent Tl(2)La4Pb8 cuboctahedra, edges with four equivalent La(1)Tl6Pb6 cuboctahedra, edges with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, edges with four equivalent Tl(3)La4Tl4Pb4 cuboctahedra, edges with four equivalent Pb(2)La4Tl4 cuboctahedra, faces with two equivalent Tl(1)La4Tl4Pb4 cuboctahedra, faces with two equivalent Tl(3)La4Tl4Pb4 cuboctahedra, faces with two equivalent Pb(2)La4Tl4 cuboctahedra, faces with four equivalent La(1)Tl6Pb6 cuboctahedra, and faces with five equivalent Pb(1)La4Tl6 cuboctahedra. In the second Pb site, Pb(2) is bonded to four equivalent La(1) and four equivalent Tl(2) atoms to form distorted PbLa4Tl4 cuboctahedra that share corners with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, corners with four equivalent Pb(2)La4Tl4 cuboctahedra, corners with eight equivalent La(1)Tl6Pb6 cuboctahedra, corners with eight equivalent Tl(3)La4Tl4Pb4 cuboctahedra, edges with two equivalent Tl(1)La4Tl4Pb4 cuboctahedra, edges with two equivalent Pb(2)La4Tl4 cuboctahedra, edges with four equivalent La(1)Tl6Pb6 cuboctahedra, edges with four equivalent Tl(2)La4Pb8 cuboctahedra, edges with eight equivalent Pb(1)La4Tl6 cuboctahedra, faces with two equivalent Pb(2)La4Tl4 cuboctahedra, and faces with four equivalent Pb(1)La4Tl6 cuboctahedra. is represented by the CIF file [CIF]
data_La2(TlPb)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.873
_cell_length_b   4.852
_cell_length_c   9.972
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   235.770
_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
  La  La0  1  0.000  0.000  0.754  1.0
  La  La1  1  0.000  0.000  0.246  1.0
  Tl  Tl2  1  0.500  0.000  0.500  1.0
  Tl  Tl3  1  0.000  0.500  0.000  1.0
  Tl  Tl4  1  0.000  0.500  0.500  1.0
  Pb  Pb5  1  0.500  0.500  0.751  1.0
  Pb  Pb6  1  0.500  0.500  0.249  1.0
  Pb  Pb7  1  0.500  0.000  0.000  1.0
[/CIF]
.
The crystal structure described by La2(TlPb)3 crystallizes in the orthorhombic Pmmm space group. La(1) is bonded to two equivalent Tl(1), two equivalent Tl(2), two equivalent Tl(3), two equivalent Pb(2), and four equivalent Pb(1) atoms to form LaTl6Pb6 cuboctahedra that share corners with four equivalent Pb(2)La4Tl4 cuboctahedra, corners with four equivalent Pb(1)La4Tl6 cuboctahedra, corners with twelve equivalent La(1)Tl6Pb6 cuboctahedra, edges with two equivalent Pb(2)La4Tl4 cuboctahedra, edges with four equivalent Tl(2)La4Pb8 cuboctahedra, edges with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, edges with four equivalent Tl(3)La4Tl4Pb4 cuboctahedra, edges with four equivalent Pb(1)La4Tl6 cuboctahedra, faces with two equivalent Tl(2)La4Pb8 cuboctahedra, faces with two equivalent Tl(1)La4Tl4Pb4 cuboctahedra, faces with two equivalent Tl(3)La4Tl4Pb4 cuboctahedra, faces with four equivalent Pb(1)La4Tl6 cuboctahedra, and faces with six equivalent La(1)Tl6Pb6 cuboctahedra. There are three inequivalent Tl sites. In the first Tl site, Tl(1) is bonded to four equivalent La(1), four equivalent Tl(3), and four equivalent Pb(1) atoms to form distorted TlLa4Tl4Pb4 cuboctahedra that share corners with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, corners with four equivalent Pb(2)La4Tl4 cuboctahedra, edges with two equivalent Pb(2)La4Tl4 cuboctahedra, edges with eight equivalent La(1)Tl6Pb6 cuboctahedra, edges with eight equivalent Tl(2)La4Pb8 cuboctahedra, edges with eight equivalent Pb(1)La4Tl6 cuboctahedra, faces with four equivalent La(1)Tl6Pb6 cuboctahedra, faces with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, faces with four equivalent Tl(3)La4Tl4Pb4 cuboctahedra, and faces with four equivalent Pb(1)La4Tl6 cuboctahedra. In the second Tl site, Tl(2) is bonded to four equivalent La(1), four equivalent Pb(1), and four equivalent Pb(2) atoms to form TlLa4Pb8 cuboctahedra that share corners with four equivalent Tl(2)La4Pb8 cuboctahedra, corners with eight equivalent Tl(3)La4Tl4Pb4 cuboctahedra, corners with eight equivalent Pb(1)La4Tl6 cuboctahedra, edges with four equivalent Pb(2)La4Tl4 cuboctahedra, edges with four equivalent Pb(1)La4Tl6 cuboctahedra, edges with eight equivalent La(1)Tl6Pb6 cuboctahedra, edges with eight equivalent Tl(1)La4Tl4Pb4 cuboctahedra, faces with two equivalent Tl(3)La4Tl4Pb4 cuboctahedra, faces with four equivalent La(1)Tl6Pb6 cuboctahedra, and faces with four equivalent Tl(2)La4Pb8 cuboctahedra. In the third Tl site, Tl(3) is bonded to four equivalent La(1), four equivalent Tl(1), and four equivalent Pb(1) atoms to form distorted TlLa4Tl4Pb4 cuboctahedra that share corners with four equivalent Tl(3)La4Tl4Pb4 cuboctahedra, corners with eight equivalent Tl(2)La4Pb8 cuboctahedra, corners with eight equivalent Pb(2)La4Tl4 cuboctahedra, edges with eight equivalent La(1)Tl6Pb6 cuboctahedra, edges with eight equivalent Pb(1)La4Tl6 cuboctahedra, faces with two equivalent Tl(2)La4Pb8 cuboctahedra, faces with four equivalent La(1)Tl6Pb6 cuboctahedra, faces with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, faces with four equivalent Tl(3)La4Tl4Pb4 cuboctahedra, and faces with four equivalent Pb(1)La4Tl6 cuboctahedra. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to four equivalent La(1), two equivalent Tl(1), two equivalent Tl(2), and two equivalent Tl(3) atoms to form distorted PbLa4Tl6 cuboctahedra that share corners with four equivalent La(1)Tl6Pb6 cuboctahedra, corners with four equivalent Tl(2)La4Pb8 cuboctahedra, corners with ten equivalent Pb(1)La4Tl6 cuboctahedra,  an edgeedge with one Pb(1)La4Tl6 cuboctahedra, edges with two equivalent Tl(2)La4Pb8 cuboctahedra, edges with four equivalent La(1)Tl6Pb6 cuboctahedra, edges with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, edges with four equivalent Tl(3)La4Tl4Pb4 cuboctahedra, edges with four equivalent Pb(2)La4Tl4 cuboctahedra, faces with two equivalent Tl(1)La4Tl4Pb4 cuboctahedra, faces with two equivalent Tl(3)La4Tl4Pb4 cuboctahedra, faces with two equivalent Pb(2)La4Tl4 cuboctahedra, faces with four equivalent La(1)Tl6Pb6 cuboctahedra, and faces with five equivalent Pb(1)La4Tl6 cuboctahedra. In the second Pb site, Pb(2) is bonded to four equivalent La(1) and four equivalent Tl(2) atoms to form distorted PbLa4Tl4 cuboctahedra that share corners with four equivalent Tl(1)La4Tl4Pb4 cuboctahedra, corners with four equivalent Pb(2)La4Tl4 cuboctahedra, corners with eight equivalent La(1)Tl6Pb6 cuboctahedra, corners with eight equivalent Tl(3)La4Tl4Pb4 cuboctahedra, edges with two equivalent Tl(1)La4Tl4Pb4 cuboctahedra, edges with two equivalent Pb(2)La4Tl4 cuboctahedra, edges with four equivalent La(1)Tl6Pb6 cuboctahedra, edges with four equivalent Tl(2)La4Pb8 cuboctahedra, edges with eight equivalent Pb(1)La4Tl6 cuboctahedra, faces with two equivalent Pb(2)La4Tl4 cuboctahedra, and faces with four equivalent Pb(1)La4Tl6 cuboctahedra. is represented by the CIF file [CIF]
data_La2(TlPb)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.873
_cell_length_b   4.852
_cell_length_c   9.972
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   235.770
_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
  La  La0  1  0.000  0.000  0.754  1.0
  La  La1  1  0.000  0.000  0.246  1.0
  Tl  Tl2  1  0.500  0.000  0.500  1.0
  Tl  Tl3  1  0.000  0.500  0.000  1.0
  Tl  Tl4  1  0.000  0.500  0.500  1.0
  Pb  Pb5  1  0.500  0.500  0.751  1.0
  Pb  Pb6  1  0.500  0.500  0.249  1.0
  Pb  Pb7  1  0.500  0.000  0.000  1.0
[/CIF]
.