The material 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 in a 5-coordinate geometry to one O(2), one O(3), and three equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted RbO5 square pyramids that share corners with three equivalent Pb(1)O4 tetrahedra, corners with two equivalent Rb(3)O4 trigonal pyramids,  an edgeedge with one Rb(2)O5 square pyramid,  an edgeedge with one Pb(1)O4 tetrahedra, and  an edgeedge with one Rb(3)O4 trigonal pyramid. In the third Rb site, Rb(3) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form distorted RbO4 trigonal pyramids that share corners with two equivalent Rb(2)O5 square pyramids, corners with four equivalent Pb(1)O4 tetrahedra,  an edgeedge with one Rb(2)O5 square pyramid, and  an edgeedge with one Rb(3)O4 trigonal pyramid. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(3), 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 square pyramids, corners with four equivalent Rb(3)O4 trigonal pyramids, and  an edgeedge with one Rb(2)O5 square pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Rb(2), three equivalent Rb(1), and one Pb(1) atom to form a mixture of distorted corner and edge-sharing ORb5Pb octahedra. The corner-sharing octahedral tilt angles range from 41-46°. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Rb(4), and one Pb(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), two equivalent Rb(4), and one Pb(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Rb(2), two equivalent Rb(3), two equivalent Rb(4), and one Pb(1) atom. is represented by the CIF file [CIF]
data_Rb4PbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.105
_cell_length_b   11.247
_cell_length_c   11.359
_cell_angle_alpha   69.626
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   850.865
_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  0.582  0.944  0.700  1.0
  Rb  Rb1  1  0.102  0.833  0.583  1.0
  Rb  Rb2  1  0.918  0.944  0.200  1.0
  Rb  Rb3  1  0.325  0.631  0.892  1.0
  Rb  Rb4  1  0.398  0.833  0.083  1.0
  Rb  Rb5  1  0.796  0.571  0.796  1.0
  Rb  Rb6  1  0.175  0.631  0.392  1.0
  Rb  Rb7  1  0.704  0.571  0.296  1.0
  Rb  Rb8  1  0.296  0.429  0.704  1.0
  Rb  Rb9  1  0.825  0.369  0.608  1.0
  Rb  Rb10  1  0.204  0.429  0.204  1.0
  Rb  Rb11  1  0.602  0.167  0.917  1.0
  Rb  Rb12  1  0.675  0.369  0.108  1.0
  Rb  Rb13  1  0.082  0.056  0.800  1.0
  Rb  Rb14  1  0.898  0.167  0.417  1.0
  Rb  Rb15  1  0.418  0.056  0.300  1.0
  Pb  Pb16  1  0.870  0.759  0.994  1.0
  Pb  Pb17  1  0.630  0.759  0.494  1.0
  Pb  Pb18  1  0.370  0.241  0.506  1.0
  Pb  Pb19  1  0.130  0.241  0.006  1.0
  O  O20  1  0.760  0.937  0.971  1.0
  O  O21  1  0.740  0.937  0.471  1.0
  O  O22  1  0.005  0.782  0.825  1.0
  O  O23  1  0.454  0.685  0.651  1.0
  O  O24  1  0.495  0.782  0.325  1.0
  O  O25  1  0.855  0.632  0.524  1.0
  O  O26  1  0.046  0.685  0.151  1.0
  O  O27  1  0.355  0.368  0.976  1.0
  O  O28  1  0.645  0.632  0.024  1.0
  O  O29  1  0.954  0.315  0.849  1.0
  O  O30  1  0.145  0.368  0.476  1.0
  O  O31  1  0.505  0.218  0.675  1.0
  O  O32  1  0.546  0.315  0.349  1.0
  O  O33  1  0.995  0.218  0.175  1.0
  O  O34  1  0.260  0.063  0.529  1.0
  O  O35  1  0.240  0.063  0.029  1.0
[/CIF]
.
The material 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 in a 5-coordinate geometry to one O(2), one O(3), and three equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted RbO5 square pyramids that share corners with three equivalent Pb(1)O4 tetrahedra, corners with two equivalent Rb(3)O4 trigonal pyramids,  an edgeedge with one Rb(2)O5 square pyramid,  an edgeedge with one Pb(1)O4 tetrahedra, and  an edgeedge with one Rb(3)O4 trigonal pyramid. In the third Rb site, Rb(3) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form distorted RbO4 trigonal pyramids that share corners with two equivalent Rb(2)O5 square pyramids, corners with four equivalent Pb(1)O4 tetrahedra,  an edgeedge with one Rb(2)O5 square pyramid, and  an edgeedge with one Rb(3)O4 trigonal pyramid. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(3), 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 square pyramids, corners with four equivalent Rb(3)O4 trigonal pyramids, and  an edgeedge with one Rb(2)O5 square pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Rb(2), three equivalent Rb(1), and one Pb(1) atom to form a mixture of distorted corner and edge-sharing ORb5Pb octahedra. The corner-sharing octahedral tilt angles range from 41-46°. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Rb(4), and one Pb(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), two equivalent Rb(4), and one Pb(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Rb(2), two equivalent Rb(3), two equivalent Rb(4), and one Pb(1) atom. is represented by the CIF file [CIF]
data_Rb4PbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.105
_cell_length_b   11.247
_cell_length_c   11.359
_cell_angle_alpha   69.626
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   850.865
_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  0.582  0.944  0.700  1.0
  Rb  Rb1  1  0.102  0.833  0.583  1.0
  Rb  Rb2  1  0.918  0.944  0.200  1.0
  Rb  Rb3  1  0.325  0.631  0.892  1.0
  Rb  Rb4  1  0.398  0.833  0.083  1.0
  Rb  Rb5  1  0.796  0.571  0.796  1.0
  Rb  Rb6  1  0.175  0.631  0.392  1.0
  Rb  Rb7  1  0.704  0.571  0.296  1.0
  Rb  Rb8  1  0.296  0.429  0.704  1.0
  Rb  Rb9  1  0.825  0.369  0.608  1.0
  Rb  Rb10  1  0.204  0.429  0.204  1.0
  Rb  Rb11  1  0.602  0.167  0.917  1.0
  Rb  Rb12  1  0.675  0.369  0.108  1.0
  Rb  Rb13  1  0.082  0.056  0.800  1.0
  Rb  Rb14  1  0.898  0.167  0.417  1.0
  Rb  Rb15  1  0.418  0.056  0.300  1.0
  Pb  Pb16  1  0.870  0.759  0.994  1.0
  Pb  Pb17  1  0.630  0.759  0.494  1.0
  Pb  Pb18  1  0.370  0.241  0.506  1.0
  Pb  Pb19  1  0.130  0.241  0.006  1.0
  O  O20  1  0.760  0.937  0.971  1.0
  O  O21  1  0.740  0.937  0.471  1.0
  O  O22  1  0.005  0.782  0.825  1.0
  O  O23  1  0.454  0.685  0.651  1.0
  O  O24  1  0.495  0.782  0.325  1.0
  O  O25  1  0.855  0.632  0.524  1.0
  O  O26  1  0.046  0.685  0.151  1.0
  O  O27  1  0.355  0.368  0.976  1.0
  O  O28  1  0.645  0.632  0.024  1.0
  O  O29  1  0.954  0.315  0.849  1.0
  O  O30  1  0.145  0.368  0.476  1.0
  O  O31  1  0.505  0.218  0.675  1.0
  O  O32  1  0.546  0.315  0.349  1.0
  O  O33  1  0.995  0.218  0.175  1.0
  O  O34  1  0.260  0.063  0.529  1.0
  O  O35  1  0.240  0.063  0.029  1.0
[/CIF]
.