The crystal structure described by Na4PbO4 crystallizes in the triclinic P-1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form NaO5 square pyramids that share corners with three equivalent Na(3)O5 square pyramids,  a cornercorner with one Pb(1)O4 tetrahedra, corners with three equivalent Na(4)O4 tetrahedra, edges with two equivalent Na(2)O5 square pyramids, edges with three equivalent Na(3)O5 square pyramids,  an edgeedge with one Na(4)O4 tetrahedra, and edges with two equivalent Pb(1)O4 tetrahedra. In the third Na site, Na(3) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form NaO5 square pyramids that share corners with three equivalent Na(2)O5 square pyramids,  a cornercorner with one Na(4)O4 tetrahedra, corners with three equivalent Pb(1)O4 tetrahedra, edges with two equivalent Na(3)O5 square pyramids, edges with three equivalent Na(2)O5 square pyramids,  an edgeedge with one Pb(1)O4 tetrahedra, and edges with two equivalent Na(4)O4 tetrahedra. In the fourth Na site, Na(4) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(3)O5 square pyramid, corners with three equivalent Na(2)O5 square pyramids, corners with four equivalent Pb(1)O4 tetrahedra,  an edgeedge with one Na(2)O5 square pyramid, and edges with two equivalent Na(3)O5 square pyramids. 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 Na(2)O5 square pyramid, corners with three equivalent Na(3)O5 square pyramids, corners with four equivalent Na(4)O4 tetrahedra,  an edgeedge with one Na(3)O5 square pyramid, and edges with two equivalent Na(2)O5 square pyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(3), one Na(4), two equivalent Na(1), and one Pb(1) atom to form ONa5Pb octahedra that share corners with two equivalent O(3)Na5Pb octahedra, corners with six equivalent O(4)Na3Pb tetrahedra,  an edgeedge with one O(1)Na5Pb octahedra, edges with two equivalent O(3)Na5Pb octahedra, and edges with three equivalent O(2)Na5Pb octahedra. The corner-sharing octahedral tilt angles range from 8-12°. In the second O site, O(2) is bonded to one Na(4), two equivalent Na(2), two equivalent Na(3), and one Pb(1) atom to form ONa5Pb octahedra that share corners with two equivalent O(3)Na5Pb octahedra, corners with two equivalent O(4)Na3Pb tetrahedra, edges with two equivalent O(2)Na5Pb octahedra, edges with three equivalent O(1)Na5Pb octahedra, and edges with four equivalent O(3)Na5Pb octahedra. The corner-sharing octahedral tilt angles range from 11-21°. In the third O site, O(3) is bonded to one Na(4), two equivalent Na(2), two equivalent Na(3), and one Pb(1) atom to form ONa5Pb octahedra that share corners with two equivalent O(1)Na5Pb octahedra, corners with two equivalent O(2)Na5Pb octahedra, corners with two equivalent O(4)Na3Pb tetrahedra, edges with two equivalent O(1)Na5Pb octahedra, edges with two equivalent O(3)Na5Pb octahedra, and edges with four equivalent O(2)Na5Pb octahedra. The corner-sharing octahedral tilt angles range from 8-21°. In the fourth O site, O(4) is bonded to one Na(4), two equivalent Na(1), and one Pb(1) atom to form ONa3Pb tetrahedra that share corners with two equivalent O(2)Na5Pb octahedra, corners with two equivalent O(3)Na5Pb octahedra, corners with six equivalent O(1)Na5Pb octahedra, and  an edgeedge with one O(4)Na3Pb tetrahedra. The corner-sharing octahedral tilt angles range from 56-65°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4PbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.928
_cell_length_b   5.922
_cell_length_c   8.952
_cell_angle_alpha   82.590
_cell_angle_beta   70.924
_cell_angle_gamma   68.737
_symmetry_Int_Tables_number   1
_cell_volume   276.794
_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
  Na  Na0  1  0.749  0.751  0.994  1.0
  Na  Na1  1  0.251  0.249  0.006  1.0
  Na  Na2  1  0.435  0.254  0.591  1.0
  Na  Na3  1  0.565  0.746  0.409  1.0
  Na  Na4  1  0.018  0.264  0.433  1.0
  Na  Na5  1  0.982  0.736  0.567  1.0
  Na  Na6  1  0.888  0.279  0.794  1.0
  Na  Na7  1  0.112  0.721  0.206  1.0
  Pb  Pb8  1  0.339  0.726  0.771  1.0
  Pb  Pb9  1  0.661  0.274  0.229  1.0
  O  O10  1  0.116  0.509  0.804  1.0
  O  O11  1  0.884  0.491  0.196  1.0
  O  O12  1  0.313  0.484  0.378  1.0
  O  O13  1  0.687  0.516  0.622  1.0
  O  O14  1  0.199  0.992  0.614  1.0
  O  O15  1  0.801  0.008  0.386  1.0
  O  O16  1  0.348  0.842  0.975  1.0
  O  O17  1  0.652  0.158  0.025  1.0
[/CIF]
.
The crystal structure described by Na4PbO4 crystallizes in the triclinic P-1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form NaO5 square pyramids that share corners with three equivalent Na(3)O5 square pyramids,  a cornercorner with one Pb(1)O4 tetrahedra, corners with three equivalent Na(4)O4 tetrahedra, edges with two equivalent Na(2)O5 square pyramids, edges with three equivalent Na(3)O5 square pyramids,  an edgeedge with one Na(4)O4 tetrahedra, and edges with two equivalent Pb(1)O4 tetrahedra. In the third Na site, Na(3) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form NaO5 square pyramids that share corners with three equivalent Na(2)O5 square pyramids,  a cornercorner with one Na(4)O4 tetrahedra, corners with three equivalent Pb(1)O4 tetrahedra, edges with two equivalent Na(3)O5 square pyramids, edges with three equivalent Na(2)O5 square pyramids,  an edgeedge with one Pb(1)O4 tetrahedra, and edges with two equivalent Na(4)O4 tetrahedra. In the fourth Na site, Na(4) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form distorted NaO4 tetrahedra that share  a cornercorner with one Na(3)O5 square pyramid, corners with three equivalent Na(2)O5 square pyramids, corners with four equivalent Pb(1)O4 tetrahedra,  an edgeedge with one Na(2)O5 square pyramid, and edges with two equivalent Na(3)O5 square pyramids. 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 Na(2)O5 square pyramid, corners with three equivalent Na(3)O5 square pyramids, corners with four equivalent Na(4)O4 tetrahedra,  an edgeedge with one Na(3)O5 square pyramid, and edges with two equivalent Na(2)O5 square pyramids. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), one Na(3), one Na(4), two equivalent Na(1), and one Pb(1) atom to form ONa5Pb octahedra that share corners with two equivalent O(3)Na5Pb octahedra, corners with six equivalent O(4)Na3Pb tetrahedra,  an edgeedge with one O(1)Na5Pb octahedra, edges with two equivalent O(3)Na5Pb octahedra, and edges with three equivalent O(2)Na5Pb octahedra. The corner-sharing octahedral tilt angles range from 8-12°. In the second O site, O(2) is bonded to one Na(4), two equivalent Na(2), two equivalent Na(3), and one Pb(1) atom to form ONa5Pb octahedra that share corners with two equivalent O(3)Na5Pb octahedra, corners with two equivalent O(4)Na3Pb tetrahedra, edges with two equivalent O(2)Na5Pb octahedra, edges with three equivalent O(1)Na5Pb octahedra, and edges with four equivalent O(3)Na5Pb octahedra. The corner-sharing octahedral tilt angles range from 11-21°. In the third O site, O(3) is bonded to one Na(4), two equivalent Na(2), two equivalent Na(3), and one Pb(1) atom to form ONa5Pb octahedra that share corners with two equivalent O(1)Na5Pb octahedra, corners with two equivalent O(2)Na5Pb octahedra, corners with two equivalent O(4)Na3Pb tetrahedra, edges with two equivalent O(1)Na5Pb octahedra, edges with two equivalent O(3)Na5Pb octahedra, and edges with four equivalent O(2)Na5Pb octahedra. The corner-sharing octahedral tilt angles range from 8-21°. In the fourth O site, O(4) is bonded to one Na(4), two equivalent Na(1), and one Pb(1) atom to form ONa3Pb tetrahedra that share corners with two equivalent O(2)Na5Pb octahedra, corners with two equivalent O(3)Na5Pb octahedra, corners with six equivalent O(1)Na5Pb octahedra, and  an edgeedge with one O(4)Na3Pb tetrahedra. The corner-sharing octahedral tilt angles range from 56-65°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4PbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.928
_cell_length_b   5.922
_cell_length_c   8.952
_cell_angle_alpha   82.590
_cell_angle_beta   70.924
_cell_angle_gamma   68.737
_symmetry_Int_Tables_number   1
_cell_volume   276.794
_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
  Na  Na0  1  0.749  0.751  0.994  1.0
  Na  Na1  1  0.251  0.249  0.006  1.0
  Na  Na2  1  0.435  0.254  0.591  1.0
  Na  Na3  1  0.565  0.746  0.409  1.0
  Na  Na4  1  0.018  0.264  0.433  1.0
  Na  Na5  1  0.982  0.736  0.567  1.0
  Na  Na6  1  0.888  0.279  0.794  1.0
  Na  Na7  1  0.112  0.721  0.206  1.0
  Pb  Pb8  1  0.339  0.726  0.771  1.0
  Pb  Pb9  1  0.661  0.274  0.229  1.0
  O  O10  1  0.116  0.509  0.804  1.0
  O  O11  1  0.884  0.491  0.196  1.0
  O  O12  1  0.313  0.484  0.378  1.0
  O  O13  1  0.687  0.516  0.622  1.0
  O  O14  1  0.199  0.992  0.614  1.0
  O  O15  1  0.801  0.008  0.386  1.0
  O  O16  1  0.348  0.842  0.975  1.0
  O  O17  1  0.652  0.158  0.025  1.0
[/CIF]
.