The crystal structure described by U2(PbSn)3 crystallizes in the orthorhombic Pmmm space group. U(1) is bonded to two equivalent Pb(2), four equivalent Pb(1), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms to form USn6Pb6 cuboctahedra that share corners with twelve equivalent U(1)Sn6Pb6 cuboctahedra, edges with four equivalent Pb(2)U4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(2)U4Pb8 cuboctahedra, edges with four equivalent Sn(1)U4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(3)U4Sn4Pb4 cuboctahedra, edges with eight equivalent Pb(1)U4Sn6Pb2 cuboctahedra, faces with two equivalent Pb(2)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(2)U4Pb8 cuboctahedra, faces with two equivalent Sn(1)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(3)U4Sn4Pb4 cuboctahedra, faces with four equivalent Pb(1)U4Sn6Pb2 cuboctahedra, and faces with six equivalent U(1)Sn6Pb6 cuboctahedra. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to four equivalent U(1), two equivalent Pb(2), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms to form distorted PbU4Sn6Pb2 cuboctahedra that share corners with twelve equivalent Pb(1)U4Sn6Pb2 cuboctahedra, edges with four equivalent Pb(2)U4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(2)U4Pb8 cuboctahedra, edges with four equivalent Sn(1)U4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(3)U4Sn4Pb4 cuboctahedra, edges with eight equivalent U(1)Sn6Pb6 cuboctahedra, faces with two equivalent Pb(2)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(2)U4Pb8 cuboctahedra, faces with two equivalent Sn(1)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(3)U4Sn4Pb4 cuboctahedra, faces with four equivalent U(1)Sn6Pb6 cuboctahedra, and faces with six equivalent Pb(1)U4Sn6Pb2 cuboctahedra. In the second Pb site, Pb(2) is bonded to four equivalent U(1), four equivalent Pb(1), and four equivalent Sn(2) atoms to form distorted PbU4Sn4Pb4 cuboctahedra that share corners with four equivalent Pb(2)U4Sn4Pb4 cuboctahedra, corners with eight equivalent Sn(1)U4Sn4Pb4 cuboctahedra, edges with eight equivalent U(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(1)U4Sn6Pb2 cuboctahedra, edges with eight equivalent Sn(3)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(1)U4Sn4Pb4 cuboctahedra, faces with four equivalent U(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(2)U4Sn4Pb4 cuboctahedra, faces with four equivalent Pb(1)U4Sn6Pb2 cuboctahedra, and faces with four equivalent Sn(2)U4Pb8 cuboctahedra. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to four equivalent U(1), four equivalent Pb(1), and four equivalent Sn(3) atoms to form distorted SnU4Sn4Pb4 cuboctahedra that share corners with four equivalent Sn(1)U4Sn4Pb4 cuboctahedra, corners with eight equivalent Pb(2)U4Sn4Pb4 cuboctahedra, edges with eight equivalent U(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(1)U4Sn6Pb2 cuboctahedra, edges with eight equivalent Sn(2)U4Pb8 cuboctahedra, faces with two equivalent Pb(2)U4Sn4Pb4 cuboctahedra, faces with four equivalent U(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(1)U4Sn6Pb2 cuboctahedra, faces with four equivalent Sn(1)U4Sn4Pb4 cuboctahedra, and faces with four equivalent Sn(3)U4Sn4Pb4 cuboctahedra. In the second Sn site, Sn(2) is bonded to four equivalent U(1), four equivalent Pb(1), and four equivalent Pb(2) atoms to form SnU4Pb8 cuboctahedra that share corners with four equivalent Sn(2)U4Pb8 cuboctahedra, corners with eight equivalent Sn(3)U4Sn4Pb4 cuboctahedra, edges with eight equivalent U(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(1)U4Sn6Pb2 cuboctahedra, edges with eight equivalent Sn(1)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(3)U4Sn4Pb4 cuboctahedra, faces with four equivalent U(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(2)U4Sn4Pb4 cuboctahedra, faces with four equivalent Pb(1)U4Sn6Pb2 cuboctahedra, and faces with four equivalent Sn(2)U4Pb8 cuboctahedra. In the third Sn site, Sn(3) is bonded to four equivalent U(1), four equivalent Pb(1), and four equivalent Sn(1) atoms to form distorted SnU4Sn4Pb4 cuboctahedra that share corners with four equivalent Sn(3)U4Sn4Pb4 cuboctahedra, corners with eight equivalent Sn(2)U4Pb8 cuboctahedra, edges with eight equivalent U(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(2)U4Sn4Pb4 cuboctahedra, edges with eight equivalent Pb(1)U4Sn6Pb2 cuboctahedra, faces with two equivalent Sn(2)U4Pb8 cuboctahedra, faces with four equivalent U(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(1)U4Sn6Pb2 cuboctahedra, faces with four equivalent Sn(1)U4Sn4Pb4 cuboctahedra, and faces with four equivalent Sn(3)U4Sn4Pb4 cuboctahedra. is represented by the CIF file [CIF]
data_U2(SnPb)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.675
_cell_length_b   4.709
_cell_length_c   9.484
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   208.787
_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
  U  U0  1  0.000  0.000  0.245  1.0
  U  U1  1  0.000  0.000  0.755  1.0
  Sn  Sn2  1  0.000  0.500  0.000  1.0
  Sn  Sn3  1  0.500  0.000  0.500  1.0
  Sn  Sn4  1  0.500  0.000  0.000  1.0
  Pb  Pb5  1  0.500  0.500  0.248  1.0
  Pb  Pb6  1  0.500  0.500  0.752  1.0
  Pb  Pb7  1  0.000  0.500  0.500  1.0
[/CIF]
.
The crystal structure described by U2(PbSn)3 crystallizes in the orthorhombic Pmmm space group. U(1) is bonded to two equivalent Pb(2), four equivalent Pb(1), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms to form USn6Pb6 cuboctahedra that share corners with twelve equivalent U(1)Sn6Pb6 cuboctahedra, edges with four equivalent Pb(2)U4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(2)U4Pb8 cuboctahedra, edges with four equivalent Sn(1)U4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(3)U4Sn4Pb4 cuboctahedra, edges with eight equivalent Pb(1)U4Sn6Pb2 cuboctahedra, faces with two equivalent Pb(2)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(2)U4Pb8 cuboctahedra, faces with two equivalent Sn(1)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(3)U4Sn4Pb4 cuboctahedra, faces with four equivalent Pb(1)U4Sn6Pb2 cuboctahedra, and faces with six equivalent U(1)Sn6Pb6 cuboctahedra. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to four equivalent U(1), two equivalent Pb(2), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms to form distorted PbU4Sn6Pb2 cuboctahedra that share corners with twelve equivalent Pb(1)U4Sn6Pb2 cuboctahedra, edges with four equivalent Pb(2)U4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(2)U4Pb8 cuboctahedra, edges with four equivalent Sn(1)U4Sn4Pb4 cuboctahedra, edges with four equivalent Sn(3)U4Sn4Pb4 cuboctahedra, edges with eight equivalent U(1)Sn6Pb6 cuboctahedra, faces with two equivalent Pb(2)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(2)U4Pb8 cuboctahedra, faces with two equivalent Sn(1)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(3)U4Sn4Pb4 cuboctahedra, faces with four equivalent U(1)Sn6Pb6 cuboctahedra, and faces with six equivalent Pb(1)U4Sn6Pb2 cuboctahedra. In the second Pb site, Pb(2) is bonded to four equivalent U(1), four equivalent Pb(1), and four equivalent Sn(2) atoms to form distorted PbU4Sn4Pb4 cuboctahedra that share corners with four equivalent Pb(2)U4Sn4Pb4 cuboctahedra, corners with eight equivalent Sn(1)U4Sn4Pb4 cuboctahedra, edges with eight equivalent U(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(1)U4Sn6Pb2 cuboctahedra, edges with eight equivalent Sn(3)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(1)U4Sn4Pb4 cuboctahedra, faces with four equivalent U(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(2)U4Sn4Pb4 cuboctahedra, faces with four equivalent Pb(1)U4Sn6Pb2 cuboctahedra, and faces with four equivalent Sn(2)U4Pb8 cuboctahedra. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to four equivalent U(1), four equivalent Pb(1), and four equivalent Sn(3) atoms to form distorted SnU4Sn4Pb4 cuboctahedra that share corners with four equivalent Sn(1)U4Sn4Pb4 cuboctahedra, corners with eight equivalent Pb(2)U4Sn4Pb4 cuboctahedra, edges with eight equivalent U(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(1)U4Sn6Pb2 cuboctahedra, edges with eight equivalent Sn(2)U4Pb8 cuboctahedra, faces with two equivalent Pb(2)U4Sn4Pb4 cuboctahedra, faces with four equivalent U(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(1)U4Sn6Pb2 cuboctahedra, faces with four equivalent Sn(1)U4Sn4Pb4 cuboctahedra, and faces with four equivalent Sn(3)U4Sn4Pb4 cuboctahedra. In the second Sn site, Sn(2) is bonded to four equivalent U(1), four equivalent Pb(1), and four equivalent Pb(2) atoms to form SnU4Pb8 cuboctahedra that share corners with four equivalent Sn(2)U4Pb8 cuboctahedra, corners with eight equivalent Sn(3)U4Sn4Pb4 cuboctahedra, edges with eight equivalent U(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(1)U4Sn6Pb2 cuboctahedra, edges with eight equivalent Sn(1)U4Sn4Pb4 cuboctahedra, faces with two equivalent Sn(3)U4Sn4Pb4 cuboctahedra, faces with four equivalent U(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(2)U4Sn4Pb4 cuboctahedra, faces with four equivalent Pb(1)U4Sn6Pb2 cuboctahedra, and faces with four equivalent Sn(2)U4Pb8 cuboctahedra. In the third Sn site, Sn(3) is bonded to four equivalent U(1), four equivalent Pb(1), and four equivalent Sn(1) atoms to form distorted SnU4Sn4Pb4 cuboctahedra that share corners with four equivalent Sn(3)U4Sn4Pb4 cuboctahedra, corners with eight equivalent Sn(2)U4Pb8 cuboctahedra, edges with eight equivalent U(1)Sn6Pb6 cuboctahedra, edges with eight equivalent Pb(2)U4Sn4Pb4 cuboctahedra, edges with eight equivalent Pb(1)U4Sn6Pb2 cuboctahedra, faces with two equivalent Sn(2)U4Pb8 cuboctahedra, faces with four equivalent U(1)Sn6Pb6 cuboctahedra, faces with four equivalent Pb(1)U4Sn6Pb2 cuboctahedra, faces with four equivalent Sn(1)U4Sn4Pb4 cuboctahedra, and faces with four equivalent Sn(3)U4Sn4Pb4 cuboctahedra. is represented by the CIF file [CIF]
data_U2(SnPb)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.675
_cell_length_b   4.709
_cell_length_c   9.484
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   208.787
_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
  U  U0  1  0.000  0.000  0.245  1.0
  U  U1  1  0.000  0.000  0.755  1.0
  Sn  Sn2  1  0.000  0.500  0.000  1.0
  Sn  Sn3  1  0.500  0.000  0.500  1.0
  Sn  Sn4  1  0.500  0.000  0.000  1.0
  Pb  Pb5  1  0.500  0.500  0.248  1.0
  Pb  Pb6  1  0.500  0.500  0.752  1.0
  Pb  Pb7  1  0.000  0.500  0.500  1.0
[/CIF]
.