The compound described by Cs4PbO3 crystallizes in the monoclinic P2_1 space group. There are eight inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a distorted see-saw-like geometry to one O(1), one O(2), one O(3), and one O(6) atom. In the second Cs site, Cs(2) is bonded in a 3-coordinate geometry to one O(2), one O(4), and one O(5) atom. In the third Cs site, Cs(3) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the fourth Cs site, Cs(4) is bonded in a 4-coordinate geometry to one O(1), one O(4), and two equivalent O(5) atoms. In the fifth Cs site, Cs(5) is bonded in a 2-coordinate geometry to one O(1), one O(5), and two equivalent O(2) atoms. In the sixth Cs site, Cs(6) is bonded in a 4-coordinate geometry to one O(2), one O(3), and two equivalent O(6) atoms. In the seventh Cs site, Cs(7) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the eighth Cs site, Cs(8) is bonded in a 3-coordinate geometry to one O(1), one O(4), and one O(5) atom. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second Pb site, Pb(2) is bonded in a distorted trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to one Cs(1), one Cs(3), one Cs(4), one Cs(5), one Cs(7), one Cs(8), and one Pb(1) atom. In the second O site, O(2) is bonded to one Cs(1), one Cs(2), one Cs(6), two equivalent Cs(5), and one Pb(1) atom to form distorted OCs5Pb octahedra that share corners with two equivalent O(2)Cs5Pb octahedra,  a cornercorner with one O(3)Cs4Pb square pyramid, and  an edgeedge with one O(3)Cs4Pb square pyramid. The corner-sharing octahedral tilt angles are 42°. In the third O site, O(3) is bonded to one Cs(1), one Cs(3), one Cs(6), one Cs(7), and one Pb(1) atom to form a mixture of distorted corner and edge-sharing OCs4Pb square pyramids. The corner-sharing octahedral tilt angles are 18°. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Cs(2), one Cs(3), one Cs(4), one Cs(7), one Cs(8), and one Pb(2) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Cs(2), one Cs(5), one Cs(8), two equivalent Cs(4), and one Pb(2) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Cs(1), one Cs(3), one Cs(7), two equivalent Cs(6), and one Pb(2) atom. is represented by the CIF card [CIF]
data_Cs4PbO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.309
_cell_length_b   11.685
_cell_length_c   11.972
_cell_angle_alpha   69.101
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   955.190
_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  0.613  0.667  0.655  1.0
  Cs  Cs1  1  0.113  0.333  0.345  1.0
  Cs  Cs2  1  0.364  0.813  0.320  1.0
  Cs  Cs3  1  0.864  0.187  0.680  1.0
  Cs  Cs4  1  0.315  0.467  0.900  1.0
  Cs  Cs5  1  0.815  0.533  0.100  1.0
  Cs  Cs6  1  0.210  0.959  0.931  1.0
  Cs  Cs7  1  0.710  0.041  0.069  1.0
  Cs  Cs8  1  0.477  0.011  0.588  1.0
  Cs  Cs9  1  0.977  0.989  0.412  1.0
  Cs  Cs10  1  0.620  0.449  0.424  1.0
  Cs  Cs11  1  0.120  0.551  0.576  1.0
  Cs  Cs12  1  0.823  0.367  0.881  1.0
  Cs  Cs13  1  0.323  0.633  0.119  1.0
  Cs  Cs14  1  0.184  0.160  0.108  1.0
  Cs  Cs15  1  0.684  0.840  0.892  1.0
  Pb  Pb16  1  0.620  0.217  0.274  1.0
  Pb  Pb17  1  0.120  0.783  0.726  1.0
  Pb  Pb18  1  0.369  0.250  0.719  1.0
  Pb  Pb19  1  0.869  0.750  0.281  1.0
  O  O20  1  0.870  0.257  0.167  1.0
  O  O21  1  0.370  0.743  0.833  1.0
  O  O22  1  0.747  0.204  0.444  1.0
  O  O23  1  0.247  0.796  0.556  1.0
  O  O24  1  0.491  0.395  0.217  1.0
  O  O25  1  0.991  0.605  0.783  1.0
  O  O26  1  0.157  0.241  0.851  1.0
  O  O27  1  0.657  0.759  0.149  1.0
  O  O28  1  0.550  0.098  0.826  1.0
  O  O29  1  0.050  0.902  0.174  1.0
  O  O30  1  0.520  0.415  0.707  1.0
  O  O31  1  0.020  0.585  0.293  1.0
[/CIF]
.
The compound described by Cs4PbO3 crystallizes in the monoclinic P2_1 space group. There are eight inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a distorted see-saw-like geometry to one O(1), one O(2), one O(3), and one O(6) atom. In the second Cs site, Cs(2) is bonded in a 3-coordinate geometry to one O(2), one O(4), and one O(5) atom. In the third Cs site, Cs(3) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the fourth Cs site, Cs(4) is bonded in a 4-coordinate geometry to one O(1), one O(4), and two equivalent O(5) atoms. In the fifth Cs site, Cs(5) is bonded in a 2-coordinate geometry to one O(1), one O(5), and two equivalent O(2) atoms. In the sixth Cs site, Cs(6) is bonded in a 4-coordinate geometry to one O(2), one O(3), and two equivalent O(6) atoms. In the seventh Cs site, Cs(7) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the eighth Cs site, Cs(8) is bonded in a 3-coordinate geometry to one O(1), one O(4), and one O(5) atom. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second Pb site, Pb(2) is bonded in a distorted trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to one Cs(1), one Cs(3), one Cs(4), one Cs(5), one Cs(7), one Cs(8), and one Pb(1) atom. In the second O site, O(2) is bonded to one Cs(1), one Cs(2), one Cs(6), two equivalent Cs(5), and one Pb(1) atom to form distorted OCs5Pb octahedra that share corners with two equivalent O(2)Cs5Pb octahedra,  a cornercorner with one O(3)Cs4Pb square pyramid, and  an edgeedge with one O(3)Cs4Pb square pyramid. The corner-sharing octahedral tilt angles are 42°. In the third O site, O(3) is bonded to one Cs(1), one Cs(3), one Cs(6), one Cs(7), and one Pb(1) atom to form a mixture of distorted corner and edge-sharing OCs4Pb square pyramids. The corner-sharing octahedral tilt angles are 18°. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Cs(2), one Cs(3), one Cs(4), one Cs(7), one Cs(8), and one Pb(2) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Cs(2), one Cs(5), one Cs(8), two equivalent Cs(4), and one Pb(2) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Cs(1), one Cs(3), one Cs(7), two equivalent Cs(6), and one Pb(2) atom. is represented by the CIF card [CIF]
data_Cs4PbO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.309
_cell_length_b   11.685
_cell_length_c   11.972
_cell_angle_alpha   69.101
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   955.190
_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  0.613  0.667  0.655  1.0
  Cs  Cs1  1  0.113  0.333  0.345  1.0
  Cs  Cs2  1  0.364  0.813  0.320  1.0
  Cs  Cs3  1  0.864  0.187  0.680  1.0
  Cs  Cs4  1  0.315  0.467  0.900  1.0
  Cs  Cs5  1  0.815  0.533  0.100  1.0
  Cs  Cs6  1  0.210  0.959  0.931  1.0
  Cs  Cs7  1  0.710  0.041  0.069  1.0
  Cs  Cs8  1  0.477  0.011  0.588  1.0
  Cs  Cs9  1  0.977  0.989  0.412  1.0
  Cs  Cs10  1  0.620  0.449  0.424  1.0
  Cs  Cs11  1  0.120  0.551  0.576  1.0
  Cs  Cs12  1  0.823  0.367  0.881  1.0
  Cs  Cs13  1  0.323  0.633  0.119  1.0
  Cs  Cs14  1  0.184  0.160  0.108  1.0
  Cs  Cs15  1  0.684  0.840  0.892  1.0
  Pb  Pb16  1  0.620  0.217  0.274  1.0
  Pb  Pb17  1  0.120  0.783  0.726  1.0
  Pb  Pb18  1  0.369  0.250  0.719  1.0
  Pb  Pb19  1  0.869  0.750  0.281  1.0
  O  O20  1  0.870  0.257  0.167  1.0
  O  O21  1  0.370  0.743  0.833  1.0
  O  O22  1  0.747  0.204  0.444  1.0
  O  O23  1  0.247  0.796  0.556  1.0
  O  O24  1  0.491  0.395  0.217  1.0
  O  O25  1  0.991  0.605  0.783  1.0
  O  O26  1  0.157  0.241  0.851  1.0
  O  O27  1  0.657  0.759  0.149  1.0
  O  O28  1  0.550  0.098  0.826  1.0
  O  O29  1  0.050  0.902  0.174  1.0
  O  O30  1  0.520  0.415  0.707  1.0
  O  O31  1  0.020  0.585  0.293  1.0
[/CIF]
.