The material structure described by Rb4PbO4 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted RbO5 square pyramids that share corners with three equivalent Rb(3)O5 square pyramids,  a cornercorner with one Pb(1)O4 tetrahedra, corners with two equivalent Rb(2)O4 trigonal pyramids, edges with two equivalent Rb(1)O5 square pyramids, edges with three equivalent Rb(3)O5 square pyramids, and edges with two equivalent Pb(1)O4 tetrahedra. In the second Rb site, Rb(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form distorted RbO4 trigonal pyramids that share corners with two equivalent Rb(1)O5 square pyramids, corners with two equivalent Rb(3)O5 square pyramids, corners with four equivalent Pb(1)O4 tetrahedra, and edges with two equivalent Rb(2)O4 trigonal pyramids. In the third Rb site, Rb(3) is bonded to one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted RbO5 square pyramids that share corners with three equivalent Rb(1)O5 square pyramids, corners with three equivalent Pb(1)O4 tetrahedra, corners with two equivalent Rb(2)O4 trigonal pyramids, edges with two equivalent Rb(3)O5 square pyramids, edges with three equivalent Rb(1)O5 square pyramids, and  an edgeedge with one Pb(1)O4 tetrahedra. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. Pb(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PbO4 tetrahedra that share  a cornercorner with one Rb(1)O5 square pyramid, corners with three equivalent Rb(3)O5 square pyramids, corners with four equivalent Rb(2)O4 trigonal pyramids,  an edgeedge with one Rb(3)O5 square pyramid, and edges with two equivalent Rb(1)O5 square pyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Rb(4), two equivalent Rb(1), two equivalent Rb(3), and one Pb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Rb(2), two equivalent Rb(4), and one Pb(1) atom. In the third O site, O(3) is bonded to one Rb(1), one Rb(3), one Rb(4), two equivalent Rb(2), and one Pb(1) atom to form distorted edge-sharing ORb5Pb octahedra. In the fourth O site, O(4) is bonded to one Rb(4), two equivalent Rb(1), two equivalent Rb(3), and one Pb(1) atom to form edge-sharing ORb5Pb octahedra. is represented by the CIF card [CIF]
data_Rb4PbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   19.378
_cell_length_b   6.864
_cell_length_c   6.894
_cell_angle_alpha   66.928
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   843.696
_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
  Rb  Rb0  1  0.808  0.317  0.198  1.0
  Rb  Rb1  1  0.014  0.252  0.223  1.0
  Rb  Rb2  1  0.217  0.193  0.288  1.0
  Rb  Rb3  1  0.416  0.227  0.354  1.0
  Rb  Rb4  1  0.692  0.817  0.198  1.0
  Rb  Rb5  1  0.486  0.752  0.223  1.0
  Rb  Rb6  1  0.283  0.693  0.288  1.0
  Rb  Rb7  1  0.084  0.727  0.354  1.0
  Rb  Rb8  1  0.916  0.273  0.646  1.0
  Rb  Rb9  1  0.717  0.307  0.712  1.0
  Rb  Rb10  1  0.514  0.248  0.777  1.0
  Rb  Rb11  1  0.308  0.183  0.802  1.0
  Rb  Rb12  1  0.584  0.773  0.646  1.0
  Rb  Rb13  1  0.783  0.807  0.712  1.0
  Rb  Rb14  1  0.986  0.748  0.777  1.0
  Rb  Rb15  1  0.192  0.683  0.802  1.0
  Pb  Pb16  1  0.623  0.309  0.254  1.0
  Pb  Pb17  1  0.877  0.809  0.254  1.0
  Pb  Pb18  1  0.123  0.191  0.746  1.0
  Pb  Pb19  1  0.377  0.691  0.746  1.0
  O  O20  1  0.326  0.487  0.018  1.0
  O  O21  1  0.544  0.130  0.204  1.0
  O  O22  1  0.904  0.987  0.428  1.0
  O  O23  1  0.174  0.987  0.018  1.0
  O  O24  1  0.956  0.630  0.204  1.0
  O  O25  1  0.693  0.080  0.446  1.0
  O  O26  1  0.596  0.487  0.428  1.0
  O  O27  1  0.807  0.580  0.446  1.0
  O  O28  1  0.193  0.420  0.554  1.0
  O  O29  1  0.404  0.513  0.572  1.0
  O  O30  1  0.307  0.920  0.554  1.0
  O  O31  1  0.044  0.370  0.796  1.0
  O  O32  1  0.826  0.013  0.982  1.0
  O  O33  1  0.096  0.013  0.572  1.0
  O  O34  1  0.456  0.870  0.796  1.0
  O  O35  1  0.674  0.513  0.982  1.0
[/CIF]
.
The material structure described by Rb4PbO4 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted RbO5 square pyramids that share corners with three equivalent Rb(3)O5 square pyramids,  a cornercorner with one Pb(1)O4 tetrahedra, corners with two equivalent Rb(2)O4 trigonal pyramids, edges with two equivalent Rb(1)O5 square pyramids, edges with three equivalent Rb(3)O5 square pyramids, and edges with two equivalent Pb(1)O4 tetrahedra. In the second Rb site, Rb(2) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form distorted RbO4 trigonal pyramids that share corners with two equivalent Rb(1)O5 square pyramids, corners with two equivalent Rb(3)O5 square pyramids, corners with four equivalent Pb(1)O4 tetrahedra, and edges with two equivalent Rb(2)O4 trigonal pyramids. In the third Rb site, Rb(3) is bonded to one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted RbO5 square pyramids that share corners with three equivalent Rb(1)O5 square pyramids, corners with three equivalent Pb(1)O4 tetrahedra, corners with two equivalent Rb(2)O4 trigonal pyramids, edges with two equivalent Rb(3)O5 square pyramids, edges with three equivalent Rb(1)O5 square pyramids, and  an edgeedge with one Pb(1)O4 tetrahedra. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. Pb(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PbO4 tetrahedra that share  a cornercorner with one Rb(1)O5 square pyramid, corners with three equivalent Rb(3)O5 square pyramids, corners with four equivalent Rb(2)O4 trigonal pyramids,  an edgeedge with one Rb(3)O5 square pyramid, and edges with two equivalent Rb(1)O5 square pyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Rb(4), two equivalent Rb(1), two equivalent Rb(3), and one Pb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Rb(2), two equivalent Rb(4), and one Pb(1) atom. In the third O site, O(3) is bonded to one Rb(1), one Rb(3), one Rb(4), two equivalent Rb(2), and one Pb(1) atom to form distorted edge-sharing ORb5Pb octahedra. In the fourth O site, O(4) is bonded to one Rb(4), two equivalent Rb(1), two equivalent Rb(3), and one Pb(1) atom to form edge-sharing ORb5Pb octahedra. is represented by the CIF card [CIF]
data_Rb4PbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   19.378
_cell_length_b   6.864
_cell_length_c   6.894
_cell_angle_alpha   66.928
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   843.696
_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
  Rb  Rb0  1  0.808  0.317  0.198  1.0
  Rb  Rb1  1  0.014  0.252  0.223  1.0
  Rb  Rb2  1  0.217  0.193  0.288  1.0
  Rb  Rb3  1  0.416  0.227  0.354  1.0
  Rb  Rb4  1  0.692  0.817  0.198  1.0
  Rb  Rb5  1  0.486  0.752  0.223  1.0
  Rb  Rb6  1  0.283  0.693  0.288  1.0
  Rb  Rb7  1  0.084  0.727  0.354  1.0
  Rb  Rb8  1  0.916  0.273  0.646  1.0
  Rb  Rb9  1  0.717  0.307  0.712  1.0
  Rb  Rb10  1  0.514  0.248  0.777  1.0
  Rb  Rb11  1  0.308  0.183  0.802  1.0
  Rb  Rb12  1  0.584  0.773  0.646  1.0
  Rb  Rb13  1  0.783  0.807  0.712  1.0
  Rb  Rb14  1  0.986  0.748  0.777  1.0
  Rb  Rb15  1  0.192  0.683  0.802  1.0
  Pb  Pb16  1  0.623  0.309  0.254  1.0
  Pb  Pb17  1  0.877  0.809  0.254  1.0
  Pb  Pb18  1  0.123  0.191  0.746  1.0
  Pb  Pb19  1  0.377  0.691  0.746  1.0
  O  O20  1  0.326  0.487  0.018  1.0
  O  O21  1  0.544  0.130  0.204  1.0
  O  O22  1  0.904  0.987  0.428  1.0
  O  O23  1  0.174  0.987  0.018  1.0
  O  O24  1  0.956  0.630  0.204  1.0
  O  O25  1  0.693  0.080  0.446  1.0
  O  O26  1  0.596  0.487  0.428  1.0
  O  O27  1  0.807  0.580  0.446  1.0
  O  O28  1  0.193  0.420  0.554  1.0
  O  O29  1  0.404  0.513  0.572  1.0
  O  O30  1  0.307  0.920  0.554  1.0
  O  O31  1  0.044  0.370  0.796  1.0
  O  O32  1  0.826  0.013  0.982  1.0
  O  O33  1  0.096  0.013  0.572  1.0
  O  O34  1  0.456  0.870  0.796  1.0
  O  O35  1  0.674  0.513  0.982  1.0
[/CIF]
.