The structure described by Cs4Pb9 is Magnesium tetraboride-like structured and crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 8-coordinate geometry to one Pb(1), one Pb(2), one Pb(3), one Pb(4), one Pb(5), one Pb(6), one Pb(7), one Pb(8), and one Pb(9) atom. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to one Pb(1), one Pb(3), one Pb(6), one Pb(8), one Pb(9), two equivalent Pb(5), and two equivalent Pb(7) atoms. In the third Cs site, Cs(3) is bonded in a 10-coordinate geometry to one Pb(1), one Pb(3), one Pb(4), one Pb(6), one Pb(7), one Pb(9), two equivalent Pb(2), and two equivalent Pb(8) atoms. In the fourth Cs site, Cs(4) is bonded in a 8-coordinate geometry to one Pb(1), one Pb(2), one Pb(3), one Pb(4), one Pb(5), one Pb(6), one Pb(7), one Pb(8), and one Pb(9) atom. There are nine inequivalent Pb sites. In the first Pb site, Pb(8) is bonded in a 9-coordinate geometry to one Cs(1), one Cs(2), one Cs(4), two equivalent Cs(3), one Pb(1), one Pb(4), one Pb(5), and one Pb(7) atom. In the second Pb site, Pb(9) is bonded in a 9-coordinate geometry to one Cs(1), one Cs(2), one Cs(3), one Cs(4), one Pb(1), one Pb(2), one Pb(3), one Pb(4), and one Pb(6) atom. In the third Pb site, Pb(1) is bonded in a 8-coordinate geometry to one Cs(1), one Cs(2), one Cs(3), one Cs(4), one Pb(4), one Pb(6), one Pb(8), and one Pb(9) atom. In the fourth Pb site, Pb(2) is bonded in a 8-coordinate geometry to one Cs(1), one Cs(4), two equivalent Cs(3), one Pb(3), one Pb(4), one Pb(5), and one Pb(9) atom. In the fifth Pb site, Pb(3) is bonded in a 9-coordinate geometry to one Cs(1), one Cs(2), one Cs(3), one Cs(4), one Pb(2), one Pb(5), one Pb(6), one Pb(7), and one Pb(9) atom. In the sixth Pb site, Pb(4) is bonded in a 8-coordinate geometry to one Cs(1), one Cs(3), one Cs(4), one Pb(1), one Pb(2), one Pb(5), one Pb(8), and one Pb(9) atom. In the seventh Pb site, Pb(5) is bonded in a 9-coordinate geometry to one Cs(1), one Cs(4), two equivalent Cs(2), one Pb(2), one Pb(3), one Pb(4), one Pb(7), and one Pb(8) atom. In the eighth Pb site, Pb(6) is bonded in a 8-coordinate geometry to one Cs(1), one Cs(2), one Cs(3), one Cs(4), one Pb(1), one Pb(3), one Pb(7), and one Pb(9) atom. In the ninth Pb site, Pb(7) is bonded in a 9-coordinate geometry to one Cs(1), one Cs(3), one Cs(4), two equivalent Cs(2), one Pb(3), one Pb(5), one Pb(6), and one Pb(8) atom. is represented by the CIF file [CIF]
data_Cs4Pb9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.124
_cell_length_b   14.925
_cell_length_c   15.994
_cell_angle_alpha   90.000
_cell_angle_beta   99.959
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   2380.258
_cell_formula_units_Z   4
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
  Cs  Cs0  1  0.514  0.730  0.879  1.0
  Cs  Cs1  1  0.257  0.458  0.485  1.0
  Cs  Cs2  1  0.609  0.931  0.340  1.0
  Cs  Cs3  1  0.743  0.542  0.515  1.0
  Cs  Cs4  1  0.103  0.271  0.908  1.0
  Cs  Cs5  1  0.014  0.770  0.379  1.0
  Cs  Cs6  1  0.243  0.958  0.015  1.0
  Cs  Cs7  1  0.397  0.771  0.592  1.0
  Cs  Cs8  1  0.891  0.431  0.160  1.0
  Cs  Cs9  1  0.897  0.729  0.092  1.0
  Cs  Cs10  1  0.603  0.229  0.408  1.0
  Cs  Cs11  1  0.109  0.569  0.840  1.0
  Cs  Cs12  1  0.486  0.270  0.121  1.0
  Cs  Cs13  1  0.391  0.069  0.660  1.0
  Cs  Cs14  1  0.986  0.230  0.621  1.0
  Cs  Cs15  1  0.757  0.042  0.985  1.0
  Pb  Pb16  1  0.035  0.713  0.634  1.0
  Pb  Pb17  1  0.221  0.990  0.398  1.0
  Pb  Pb18  1  0.465  0.213  0.866  1.0
  Pb  Pb19  1  0.193  0.603  0.245  1.0
  Pb  Pb20  1  0.965  0.287  0.366  1.0
  Pb  Pb21  1  0.055  0.921  0.594  1.0
  Pb  Pb22  1  0.779  0.010  0.602  1.0
  Pb  Pb23  1  0.978  0.007  0.776  1.0
  Pb  Pb24  1  0.285  0.802  0.226  1.0
  Pb  Pb25  1  0.061  0.177  0.130  1.0
  Pb  Pb26  1  0.561  0.323  0.630  1.0
  Pb  Pb27  1  0.807  0.397  0.755  1.0
  Pb  Pb28  1  0.215  0.302  0.274  1.0
  Pb  Pb29  1  0.445  0.421  0.906  1.0
  Pb  Pb30  1  0.439  0.677  0.370  1.0
  Pb  Pb31  1  0.022  0.993  0.224  1.0
  Pb  Pb32  1  0.945  0.079  0.406  1.0
  Pb  Pb33  1  0.535  0.787  0.134  1.0
  Pb  Pb34  1  0.939  0.823  0.870  1.0
  Pb  Pb35  1  0.178  0.845  0.773  1.0
  Pb  Pb36  1  0.555  0.579  0.094  1.0
  Pb  Pb37  1  0.693  0.897  0.745  1.0
  Pb  Pb38  1  0.785  0.698  0.726  1.0
  Pb  Pb39  1  0.721  0.510  0.898  1.0
  Pb  Pb40  1  0.478  0.493  0.276  1.0
  Pb  Pb41  1  0.715  0.198  0.774  1.0
  Pb  Pb42  1  0.268  0.691  0.059  1.0
  Pb  Pb43  1  0.732  0.309  0.941  1.0
  Pb  Pb44  1  0.678  0.655  0.273  1.0
  Pb  Pb45  1  0.768  0.809  0.559  1.0
  Pb  Pb46  1  0.522  0.507  0.724  1.0
  Pb  Pb47  1  0.322  0.345  0.727  1.0
  Pb  Pb48  1  0.307  0.103  0.255  1.0
  Pb  Pb49  1  0.822  0.155  0.227  1.0
  Pb  Pb50  1  0.279  0.490  0.102  1.0
  Pb  Pb51  1  0.232  0.191  0.441  1.0
[/CIF]
.
The structure described by Cs4Pb9 is Magnesium tetraboride-like structured and crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 8-coordinate geometry to one Pb(1), one Pb(2), one Pb(3), one Pb(4), one Pb(5), one Pb(6), one Pb(7), one Pb(8), and one Pb(9) atom. In the second Cs site, Cs(2) is bonded in a 9-coordinate geometry to one Pb(1), one Pb(3), one Pb(6), one Pb(8), one Pb(9), two equivalent Pb(5), and two equivalent Pb(7) atoms. In the third Cs site, Cs(3) is bonded in a 10-coordinate geometry to one Pb(1), one Pb(3), one Pb(4), one Pb(6), one Pb(7), one Pb(9), two equivalent Pb(2), and two equivalent Pb(8) atoms. In the fourth Cs site, Cs(4) is bonded in a 8-coordinate geometry to one Pb(1), one Pb(2), one Pb(3), one Pb(4), one Pb(5), one Pb(6), one Pb(7), one Pb(8), and one Pb(9) atom. There are nine inequivalent Pb sites. In the first Pb site, Pb(8) is bonded in a 9-coordinate geometry to one Cs(1), one Cs(2), one Cs(4), two equivalent Cs(3), one Pb(1), one Pb(4), one Pb(5), and one Pb(7) atom. In the second Pb site, Pb(9) is bonded in a 9-coordinate geometry to one Cs(1), one Cs(2), one Cs(3), one Cs(4), one Pb(1), one Pb(2), one Pb(3), one Pb(4), and one Pb(6) atom. In the third Pb site, Pb(1) is bonded in a 8-coordinate geometry to one Cs(1), one Cs(2), one Cs(3), one Cs(4), one Pb(4), one Pb(6), one Pb(8), and one Pb(9) atom. In the fourth Pb site, Pb(2) is bonded in a 8-coordinate geometry to one Cs(1), one Cs(4), two equivalent Cs(3), one Pb(3), one Pb(4), one Pb(5), and one Pb(9) atom. In the fifth Pb site, Pb(3) is bonded in a 9-coordinate geometry to one Cs(1), one Cs(2), one Cs(3), one Cs(4), one Pb(2), one Pb(5), one Pb(6), one Pb(7), and one Pb(9) atom. In the sixth Pb site, Pb(4) is bonded in a 8-coordinate geometry to one Cs(1), one Cs(3), one Cs(4), one Pb(1), one Pb(2), one Pb(5), one Pb(8), and one Pb(9) atom. In the seventh Pb site, Pb(5) is bonded in a 9-coordinate geometry to one Cs(1), one Cs(4), two equivalent Cs(2), one Pb(2), one Pb(3), one Pb(4), one Pb(7), and one Pb(8) atom. In the eighth Pb site, Pb(6) is bonded in a 8-coordinate geometry to one Cs(1), one Cs(2), one Cs(3), one Cs(4), one Pb(1), one Pb(3), one Pb(7), and one Pb(9) atom. In the ninth Pb site, Pb(7) is bonded in a 9-coordinate geometry to one Cs(1), one Cs(3), one Cs(4), two equivalent Cs(2), one Pb(3), one Pb(5), one Pb(6), and one Pb(8) atom. is represented by the CIF file [CIF]
data_Cs4Pb9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.124
_cell_length_b   14.925
_cell_length_c   15.994
_cell_angle_alpha   90.000
_cell_angle_beta   99.959
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   2380.258
_cell_formula_units_Z   4
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
  Cs  Cs0  1  0.514  0.730  0.879  1.0
  Cs  Cs1  1  0.257  0.458  0.485  1.0
  Cs  Cs2  1  0.609  0.931  0.340  1.0
  Cs  Cs3  1  0.743  0.542  0.515  1.0
  Cs  Cs4  1  0.103  0.271  0.908  1.0
  Cs  Cs5  1  0.014  0.770  0.379  1.0
  Cs  Cs6  1  0.243  0.958  0.015  1.0
  Cs  Cs7  1  0.397  0.771  0.592  1.0
  Cs  Cs8  1  0.891  0.431  0.160  1.0
  Cs  Cs9  1  0.897  0.729  0.092  1.0
  Cs  Cs10  1  0.603  0.229  0.408  1.0
  Cs  Cs11  1  0.109  0.569  0.840  1.0
  Cs  Cs12  1  0.486  0.270  0.121  1.0
  Cs  Cs13  1  0.391  0.069  0.660  1.0
  Cs  Cs14  1  0.986  0.230  0.621  1.0
  Cs  Cs15  1  0.757  0.042  0.985  1.0
  Pb  Pb16  1  0.035  0.713  0.634  1.0
  Pb  Pb17  1  0.221  0.990  0.398  1.0
  Pb  Pb18  1  0.465  0.213  0.866  1.0
  Pb  Pb19  1  0.193  0.603  0.245  1.0
  Pb  Pb20  1  0.965  0.287  0.366  1.0
  Pb  Pb21  1  0.055  0.921  0.594  1.0
  Pb  Pb22  1  0.779  0.010  0.602  1.0
  Pb  Pb23  1  0.978  0.007  0.776  1.0
  Pb  Pb24  1  0.285  0.802  0.226  1.0
  Pb  Pb25  1  0.061  0.177  0.130  1.0
  Pb  Pb26  1  0.561  0.323  0.630  1.0
  Pb  Pb27  1  0.807  0.397  0.755  1.0
  Pb  Pb28  1  0.215  0.302  0.274  1.0
  Pb  Pb29  1  0.445  0.421  0.906  1.0
  Pb  Pb30  1  0.439  0.677  0.370  1.0
  Pb  Pb31  1  0.022  0.993  0.224  1.0
  Pb  Pb32  1  0.945  0.079  0.406  1.0
  Pb  Pb33  1  0.535  0.787  0.134  1.0
  Pb  Pb34  1  0.939  0.823  0.870  1.0
  Pb  Pb35  1  0.178  0.845  0.773  1.0
  Pb  Pb36  1  0.555  0.579  0.094  1.0
  Pb  Pb37  1  0.693  0.897  0.745  1.0
  Pb  Pb38  1  0.785  0.698  0.726  1.0
  Pb  Pb39  1  0.721  0.510  0.898  1.0
  Pb  Pb40  1  0.478  0.493  0.276  1.0
  Pb  Pb41  1  0.715  0.198  0.774  1.0
  Pb  Pb42  1  0.268  0.691  0.059  1.0
  Pb  Pb43  1  0.732  0.309  0.941  1.0
  Pb  Pb44  1  0.678  0.655  0.273  1.0
  Pb  Pb45  1  0.768  0.809  0.559  1.0
  Pb  Pb46  1  0.522  0.507  0.724  1.0
  Pb  Pb47  1  0.322  0.345  0.727  1.0
  Pb  Pb48  1  0.307  0.103  0.255  1.0
  Pb  Pb49  1  0.822  0.155  0.227  1.0
  Pb  Pb50  1  0.279  0.490  0.102  1.0
  Pb  Pb51  1  0.232  0.191  0.441  1.0
[/CIF]
.