The material structure described by Rb4PbO4 crystallizes in the triclinic P-1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form distorted RbO4 trigonal pyramids that share corners with four equivalent Pb(1)O4 tetrahedra, corners with two equivalent Rb(2)O5 trigonal bipyramids, and edges with two equivalent Rb(1)O4 trigonal pyramids. In the second Rb site, Rb(2) is bonded to one O(3), two equivalent O(2), and two equivalent O(4) atoms to form distorted RbO5 trigonal bipyramids that share corners with three equivalent Pb(1)O4 tetrahedra, corners with two equivalent Rb(1)O4 trigonal pyramids,  an edgeedge with one Pb(1)O4 tetrahedra, and edges with two equivalent Rb(2)O5 trigonal bipyramids. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(2), and two equivalent O(4) 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 corners with three equivalent Rb(2)O5 trigonal bipyramids, corners with four equivalent Rb(1)O4 trigonal pyramids, and  an edgeedge with one Rb(2)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Rb(3), and one Pb(1) atom. In the second O site, O(2) is bonded to one Rb(3), two equivalent Rb(2), two equivalent Rb(4), and one Pb(1) atom to form a mixture of edge and corner-sharing ORb5Pb octahedra. The corner-sharing octahedral tilt angles range from 11-31°. In the third O site, O(3) is bonded to one Rb(2), one Rb(3), one Rb(4), two equivalent Rb(1), and one Pb(1) atom to form a mixture of distorted edge and corner-sharing ORb5Pb octahedra. The corner-sharing octahedral tilt angles range from 19-21°. In the fourth O site, O(4) is bonded to one Rb(3), two equivalent Rb(2), two equivalent Rb(4), and one Pb(1) atom to form a mixture of distorted edge and corner-sharing ORb5Pb octahedra. The corner-sharing octahedral tilt angles range from 11-31°. is represented by the CIF file [CIF]
data_Rb4PbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.893
_cell_length_b   6.867
_cell_length_c   10.269
_cell_angle_alpha   78.919
_cell_angle_beta   71.525
_cell_angle_gamma   66.889
_symmetry_Int_Tables_number   1
_cell_volume   422.725
_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
  Rb  Rb0  1  0.238  0.760  0.970  1.0
  Rb  Rb1  1  0.492  0.723  0.559  1.0
  Rb  Rb2  1  0.586  0.746  0.167  1.0
  Rb  Rb3  1  0.037  0.782  0.382  1.0
  Rb  Rb4  1  0.963  0.218  0.618  1.0
  Rb  Rb5  1  0.414  0.254  0.833  1.0
  Rb  Rb6  1  0.508  0.277  0.441  1.0
  Rb  Rb7  1  0.762  0.240  0.030  1.0
  Pb  Pb8  1  0.845  0.721  0.754  1.0
  Pb  Pb9  1  0.155  0.279  0.246  1.0
  O  O10  1  0.837  0.877  0.912  1.0
  O  O11  1  0.698  0.969  0.621  1.0
  O  O12  1  0.655  0.529  0.810  1.0
  O  O13  1  0.841  0.463  0.356  1.0
  O  O14  1  0.159  0.537  0.644  1.0
  O  O15  1  0.345  0.471  0.190  1.0
  O  O16  1  0.302  0.031  0.379  1.0
  O  O17  1  0.163  0.123  0.088  1.0
[/CIF]
.
The material structure described by Rb4PbO4 crystallizes in the triclinic P-1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form distorted RbO4 trigonal pyramids that share corners with four equivalent Pb(1)O4 tetrahedra, corners with two equivalent Rb(2)O5 trigonal bipyramids, and edges with two equivalent Rb(1)O4 trigonal pyramids. In the second Rb site, Rb(2) is bonded to one O(3), two equivalent O(2), and two equivalent O(4) atoms to form distorted RbO5 trigonal bipyramids that share corners with three equivalent Pb(1)O4 tetrahedra, corners with two equivalent Rb(1)O4 trigonal pyramids,  an edgeedge with one Pb(1)O4 tetrahedra, and edges with two equivalent Rb(2)O5 trigonal bipyramids. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(2), and two equivalent O(4) 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 corners with three equivalent Rb(2)O5 trigonal bipyramids, corners with four equivalent Rb(1)O4 trigonal pyramids, and  an edgeedge with one Rb(2)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Rb(3), and one Pb(1) atom. In the second O site, O(2) is bonded to one Rb(3), two equivalent Rb(2), two equivalent Rb(4), and one Pb(1) atom to form a mixture of edge and corner-sharing ORb5Pb octahedra. The corner-sharing octahedral tilt angles range from 11-31°. In the third O site, O(3) is bonded to one Rb(2), one Rb(3), one Rb(4), two equivalent Rb(1), and one Pb(1) atom to form a mixture of distorted edge and corner-sharing ORb5Pb octahedra. The corner-sharing octahedral tilt angles range from 19-21°. In the fourth O site, O(4) is bonded to one Rb(3), two equivalent Rb(2), two equivalent Rb(4), and one Pb(1) atom to form a mixture of distorted edge and corner-sharing ORb5Pb octahedra. The corner-sharing octahedral tilt angles range from 11-31°. is represented by the CIF file [CIF]
data_Rb4PbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.893
_cell_length_b   6.867
_cell_length_c   10.269
_cell_angle_alpha   78.919
_cell_angle_beta   71.525
_cell_angle_gamma   66.889
_symmetry_Int_Tables_number   1
_cell_volume   422.725
_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
  Rb  Rb0  1  0.238  0.760  0.970  1.0
  Rb  Rb1  1  0.492  0.723  0.559  1.0
  Rb  Rb2  1  0.586  0.746  0.167  1.0
  Rb  Rb3  1  0.037  0.782  0.382  1.0
  Rb  Rb4  1  0.963  0.218  0.618  1.0
  Rb  Rb5  1  0.414  0.254  0.833  1.0
  Rb  Rb6  1  0.508  0.277  0.441  1.0
  Rb  Rb7  1  0.762  0.240  0.030  1.0
  Pb  Pb8  1  0.845  0.721  0.754  1.0
  Pb  Pb9  1  0.155  0.279  0.246  1.0
  O  O10  1  0.837  0.877  0.912  1.0
  O  O11  1  0.698  0.969  0.621  1.0
  O  O12  1  0.655  0.529  0.810  1.0
  O  O13  1  0.841  0.463  0.356  1.0
  O  O14  1  0.159  0.537  0.644  1.0
  O  O15  1  0.345  0.471  0.190  1.0
  O  O16  1  0.302  0.031  0.379  1.0
  O  O17  1  0.163  0.123  0.088  1.0
[/CIF]
.