The structure described by U8Pb3 crystallizes in the orthorhombic Pmn2_1 space group. There are six inequivalent U sites. In the first U site, U(1) is bonded in a 5-coordinate geometry to two equivalent U(4), four equivalent U(3), one Pb(1), one Pb(2), and one Pb(3) atom. In the second U site, U(2) is bonded in a 6-coordinate geometry to two equivalent U(3), two equivalent U(4), one Pb(2), one Pb(3), and two equivalent Pb(1) atoms. In the third U site, U(3) is bonded in a 11-coordinate geometry to one U(2), two equivalent U(1), two equivalent U(3), two equivalent U(5), one Pb(1), one Pb(2), and two equivalent Pb(3) atoms. In the fourth U site, U(4) is bonded in a 6-coordinate geometry to one U(1), one U(2), one U(6), one Pb(1), and two equivalent Pb(2) atoms. In the fifth U site, U(5) is bonded in a 3-coordinate geometry to four equivalent U(3) and one Pb(1) atom. In the sixth U site, U(6) is bonded in a 6-coordinate geometry to two equivalent U(4), one Pb(1), one Pb(3), and two equivalent Pb(2) atoms. There are three inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 12-coordinate geometry to one U(1), one U(5), one U(6), two equivalent U(2), two equivalent U(3), two equivalent U(4), one Pb(2), and two equivalent Pb(3) atoms. In the second Pb site, Pb(2) is bonded in a 11-coordinate geometry to one U(1), one U(2), two equivalent U(3), two equivalent U(6), four equivalent U(4), and one Pb(1) atom. In the third Pb site, Pb(3) is bonded in a 7-coordinate geometry to one U(1), one U(2), one U(6), four equivalent U(3), and two equivalent Pb(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_U8Pb3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.162
_cell_length_b   9.147
_cell_length_c   9.641
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   543.459
_cell_formula_units_Z   2
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  0.750  0.560  0.425  1.0
  U  U1  1  0.750  0.078  0.097  1.0
  U  U2  1  0.250  0.422  0.597  1.0
  U  U3  1  0.250  0.940  0.925  1.0
  U  U4  1  0.985  0.734  0.150  1.0
  U  U5  1  0.498  0.332  0.404  1.0
  U  U6  1  0.502  0.168  0.904  1.0
  U  U7  1  0.015  0.766  0.650  1.0
  U  U8  1  0.998  0.168  0.904  1.0
  U  U9  1  0.485  0.766  0.650  1.0
  U  U10  1  0.515  0.734  0.150  1.0
  U  U11  1  0.002  0.332  0.404  1.0
  U  U12  1  0.250  0.654  0.351  1.0
  U  U13  1  0.250  0.302  0.082  1.0
  U  U14  1  0.750  0.198  0.582  1.0
  U  U15  1  0.750  0.846  0.851  1.0
  Pb  Pb16  1  0.250  0.018  0.265  1.0
  Pb  Pb17  1  0.750  0.482  0.765  1.0
  Pb  Pb18  1  0.750  0.423  0.110  1.0
  Pb  Pb19  1  0.750  0.920  0.394  1.0
  Pb  Pb20  1  0.250  0.580  0.894  1.0
  Pb  Pb21  1  0.250  0.077  0.610  1.0
[/CIF]
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The structure described by U8Pb3 crystallizes in the orthorhombic Pmn2_1 space group. There are six inequivalent U sites. In the first U site, U(1) is bonded in a 5-coordinate geometry to two equivalent U(4), four equivalent U(3), one Pb(1), one Pb(2), and one Pb(3) atom. In the second U site, U(2) is bonded in a 6-coordinate geometry to two equivalent U(3), two equivalent U(4), one Pb(2), one Pb(3), and two equivalent Pb(1) atoms. In the third U site, U(3) is bonded in a 11-coordinate geometry to one U(2), two equivalent U(1), two equivalent U(3), two equivalent U(5), one Pb(1), one Pb(2), and two equivalent Pb(3) atoms. In the fourth U site, U(4) is bonded in a 6-coordinate geometry to one U(1), one U(2), one U(6), one Pb(1), and two equivalent Pb(2) atoms. In the fifth U site, U(5) is bonded in a 3-coordinate geometry to four equivalent U(3) and one Pb(1) atom. In the sixth U site, U(6) is bonded in a 6-coordinate geometry to two equivalent U(4), one Pb(1), one Pb(3), and two equivalent Pb(2) atoms. There are three inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 12-coordinate geometry to one U(1), one U(5), one U(6), two equivalent U(2), two equivalent U(3), two equivalent U(4), one Pb(2), and two equivalent Pb(3) atoms. In the second Pb site, Pb(2) is bonded in a 11-coordinate geometry to one U(1), one U(2), two equivalent U(3), two equivalent U(6), four equivalent U(4), and one Pb(1) atom. In the third Pb site, Pb(3) is bonded in a 7-coordinate geometry to one U(1), one U(2), one U(6), four equivalent U(3), and two equivalent Pb(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_U8Pb3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.162
_cell_length_b   9.147
_cell_length_c   9.641
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   543.459
_cell_formula_units_Z   2
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  0.750  0.560  0.425  1.0
  U  U1  1  0.750  0.078  0.097  1.0
  U  U2  1  0.250  0.422  0.597  1.0
  U  U3  1  0.250  0.940  0.925  1.0
  U  U4  1  0.985  0.734  0.150  1.0
  U  U5  1  0.498  0.332  0.404  1.0
  U  U6  1  0.502  0.168  0.904  1.0
  U  U7  1  0.015  0.766  0.650  1.0
  U  U8  1  0.998  0.168  0.904  1.0
  U  U9  1  0.485  0.766  0.650  1.0
  U  U10  1  0.515  0.734  0.150  1.0
  U  U11  1  0.002  0.332  0.404  1.0
  U  U12  1  0.250  0.654  0.351  1.0
  U  U13  1  0.250  0.302  0.082  1.0
  U  U14  1  0.750  0.198  0.582  1.0
  U  U15  1  0.750  0.846  0.851  1.0
  Pb  Pb16  1  0.250  0.018  0.265  1.0
  Pb  Pb17  1  0.750  0.482  0.765  1.0
  Pb  Pb18  1  0.750  0.423  0.110  1.0
  Pb  Pb19  1  0.750  0.920  0.394  1.0
  Pb  Pb20  1  0.250  0.580  0.894  1.0
  Pb  Pb21  1  0.250  0.077  0.610  1.0
[/CIF]
.