The material structure described by K6Pb2O5 crystallizes in the triclinic P-1 space group. There are six inequivalent K sites. In the first K site, K(1) is bonded to one O(1), one O(4), one O(5), and two equivalent O(3) atoms to form distorted edge-sharing KO5 square pyramids. In the second K site, K(2) is bonded in a distorted rectangular see-saw-like geometry to one O(4), one O(5), and two equivalent O(3) atoms. In the third K site, K(3) is bonded in a distorted see-saw-like geometry to one O(1), one O(5), and two equivalent O(2) atoms. In the fourth K site, K(4) is bonded in a distorted see-saw-like geometry to one O(4), one O(5), and two equivalent O(2) atoms. In the fifth K site, K(5) is bonded in a distorted see-saw-like geometry to one O(1), one O(2), one O(4), and one O(5) atom. In the sixth K site, K(6) is bonded in a distorted T-shaped geometry to one O(1), one O(3), and one O(4) atom. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(5) atom. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded to one K(1), one K(3), one K(5), one K(6), one Pb(1), and one Pb(2) atom to form a mixture of distorted edge and corner-sharing OK4Pb2 octahedra. The corner-sharing octahedral tilt angles range from 13-14°. In the second O site, O(2) is bonded to one K(5), two equivalent K(3), two equivalent K(4), and one Pb(2) atom to form OK5Pb octahedra that share corners with three equivalent O(5)K5Pb octahedra,  an edgeedge with one O(5)K5Pb octahedra, edges with two equivalent O(1)K4Pb2 octahedra, edges with two equivalent O(2)K5Pb octahedra, and edges with two equivalent O(4)K5Pb octahedra. The corner-sharing octahedral tilt angles range from 9-13°. In the third O site, O(3) is bonded to one K(6), two equivalent K(1), two equivalent K(2), and one Pb(1) atom to form OK5Pb octahedra that share  a cornercorner with one O(4)K5Pb octahedra,  a cornercorner with one O(5)K5Pb octahedra, corners with two equivalent O(1)K4Pb2 octahedra,  an edgeedge with one O(1)K4Pb2 octahedra, edges with two equivalent O(3)K5Pb octahedra, edges with two equivalent O(4)K5Pb octahedra, and edges with two equivalent O(5)K5Pb octahedra. The corner-sharing octahedral tilt angles range from 13-25°. In the fourth O site, O(4) is bonded to one K(1), one K(2), one K(4), one K(5), one K(6), and one Pb(2) atom to form OK5Pb octahedra that share  a cornercorner with one O(3)K5Pb octahedra, edges with two equivalent O(1)K4Pb2 octahedra, edges with two equivalent O(2)K5Pb octahedra, edges with two equivalent O(3)K5Pb octahedra, and edges with two equivalent O(5)K5Pb octahedra. The corner-sharing octahedral tilt angles are 17°. In the fifth O site, O(5) is bonded to one K(1), one K(2), one K(3), one K(4), one K(5), and one Pb(1) atom to form OK5Pb octahedra that share  a cornercorner with one O(3)K5Pb octahedra, corners with three equivalent O(2)K5Pb octahedra,  an edgeedge with one O(2)K5Pb octahedra, edges with two equivalent O(1)K4Pb2 octahedra, edges with two equivalent O(3)K5Pb octahedra, and edges with two equivalent O(4)K5Pb octahedra. The corner-sharing octahedral tilt angles range from 9-25°. is represented by the Crystallographic Information File (CIF) [CIF]
data_K6Pb2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.406
_cell_length_b   7.607
_cell_length_c   12.454
_cell_angle_alpha   78.848
_cell_angle_beta   84.134
_cell_angle_gamma   87.783
_symmetry_Int_Tables_number   1
_cell_volume   592.239
_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
  K  K0  1  0.433  0.608  0.365  1.0
  K  K1  1  0.567  0.392  0.635  1.0
  K  K2  1  0.921  0.407  0.384  1.0
  K  K3  1  0.079  0.593  0.616  1.0
  K  K4  1  0.316  0.949  0.123  1.0
  K  K5  1  0.684  0.051  0.877  1.0
  K  K6  1  0.305  0.488  0.122  1.0
  K  K7  1  0.695  0.512  0.878  1.0
  K  K8  1  0.778  0.701  0.125  1.0
  K  K9  1  0.222  0.299  0.875  1.0
  K  K10  1  0.410  0.133  0.375  1.0
  K  K11  1  0.590  0.867  0.625  1.0
  Pb  Pb12  1  0.913  0.871  0.355  1.0
  Pb  Pb13  1  0.087  0.129  0.645  1.0
  Pb  Pb14  1  0.759  0.210  0.136  1.0
  Pb  Pb15  1  0.241  0.790  0.864  1.0
  O  O16  1  0.648  0.948  0.245  1.0
  O  O17  1  0.352  0.052  0.755  1.0
  O  O18  1  0.515  0.242  0.026  1.0
  O  O19  1  0.485  0.758  0.974  1.0
  O  O20  1  0.746  0.674  0.478  1.0
  O  O21  1  0.254  0.326  0.522  1.0
  O  O22  1  0.620  0.383  0.243  1.0
  O  O23  1  0.380  0.617  0.757  1.0
  O  O24  1  0.081  0.694  0.258  1.0
  O  O25  1  0.919  0.306  0.742  1.0
[/CIF]
.
The material structure described by K6Pb2O5 crystallizes in the triclinic P-1 space group. There are six inequivalent K sites. In the first K site, K(1) is bonded to one O(1), one O(4), one O(5), and two equivalent O(3) atoms to form distorted edge-sharing KO5 square pyramids. In the second K site, K(2) is bonded in a distorted rectangular see-saw-like geometry to one O(4), one O(5), and two equivalent O(3) atoms. In the third K site, K(3) is bonded in a distorted see-saw-like geometry to one O(1), one O(5), and two equivalent O(2) atoms. In the fourth K site, K(4) is bonded in a distorted see-saw-like geometry to one O(4), one O(5), and two equivalent O(2) atoms. In the fifth K site, K(5) is bonded in a distorted see-saw-like geometry to one O(1), one O(2), one O(4), and one O(5) atom. In the sixth K site, K(6) is bonded in a distorted T-shaped geometry to one O(1), one O(3), and one O(4) atom. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(5) atom. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded to one K(1), one K(3), one K(5), one K(6), one Pb(1), and one Pb(2) atom to form a mixture of distorted edge and corner-sharing OK4Pb2 octahedra. The corner-sharing octahedral tilt angles range from 13-14°. In the second O site, O(2) is bonded to one K(5), two equivalent K(3), two equivalent K(4), and one Pb(2) atom to form OK5Pb octahedra that share corners with three equivalent O(5)K5Pb octahedra,  an edgeedge with one O(5)K5Pb octahedra, edges with two equivalent O(1)K4Pb2 octahedra, edges with two equivalent O(2)K5Pb octahedra, and edges with two equivalent O(4)K5Pb octahedra. The corner-sharing octahedral tilt angles range from 9-13°. In the third O site, O(3) is bonded to one K(6), two equivalent K(1), two equivalent K(2), and one Pb(1) atom to form OK5Pb octahedra that share  a cornercorner with one O(4)K5Pb octahedra,  a cornercorner with one O(5)K5Pb octahedra, corners with two equivalent O(1)K4Pb2 octahedra,  an edgeedge with one O(1)K4Pb2 octahedra, edges with two equivalent O(3)K5Pb octahedra, edges with two equivalent O(4)K5Pb octahedra, and edges with two equivalent O(5)K5Pb octahedra. The corner-sharing octahedral tilt angles range from 13-25°. In the fourth O site, O(4) is bonded to one K(1), one K(2), one K(4), one K(5), one K(6), and one Pb(2) atom to form OK5Pb octahedra that share  a cornercorner with one O(3)K5Pb octahedra, edges with two equivalent O(1)K4Pb2 octahedra, edges with two equivalent O(2)K5Pb octahedra, edges with two equivalent O(3)K5Pb octahedra, and edges with two equivalent O(5)K5Pb octahedra. The corner-sharing octahedral tilt angles are 17°. In the fifth O site, O(5) is bonded to one K(1), one K(2), one K(3), one K(4), one K(5), and one Pb(1) atom to form OK5Pb octahedra that share  a cornercorner with one O(3)K5Pb octahedra, corners with three equivalent O(2)K5Pb octahedra,  an edgeedge with one O(2)K5Pb octahedra, edges with two equivalent O(1)K4Pb2 octahedra, edges with two equivalent O(3)K5Pb octahedra, and edges with two equivalent O(4)K5Pb octahedra. The corner-sharing octahedral tilt angles range from 9-25°. is represented by the Crystallographic Information File (CIF) [CIF]
data_K6Pb2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.406
_cell_length_b   7.607
_cell_length_c   12.454
_cell_angle_alpha   78.848
_cell_angle_beta   84.134
_cell_angle_gamma   87.783
_symmetry_Int_Tables_number   1
_cell_volume   592.239
_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
  K  K0  1  0.433  0.608  0.365  1.0
  K  K1  1  0.567  0.392  0.635  1.0
  K  K2  1  0.921  0.407  0.384  1.0
  K  K3  1  0.079  0.593  0.616  1.0
  K  K4  1  0.316  0.949  0.123  1.0
  K  K5  1  0.684  0.051  0.877  1.0
  K  K6  1  0.305  0.488  0.122  1.0
  K  K7  1  0.695  0.512  0.878  1.0
  K  K8  1  0.778  0.701  0.125  1.0
  K  K9  1  0.222  0.299  0.875  1.0
  K  K10  1  0.410  0.133  0.375  1.0
  K  K11  1  0.590  0.867  0.625  1.0
  Pb  Pb12  1  0.913  0.871  0.355  1.0
  Pb  Pb13  1  0.087  0.129  0.645  1.0
  Pb  Pb14  1  0.759  0.210  0.136  1.0
  Pb  Pb15  1  0.241  0.790  0.864  1.0
  O  O16  1  0.648  0.948  0.245  1.0
  O  O17  1  0.352  0.052  0.755  1.0
  O  O18  1  0.515  0.242  0.026  1.0
  O  O19  1  0.485  0.758  0.974  1.0
  O  O20  1  0.746  0.674  0.478  1.0
  O  O21  1  0.254  0.326  0.522  1.0
  O  O22  1  0.620  0.383  0.243  1.0
  O  O23  1  0.380  0.617  0.757  1.0
  O  O24  1  0.081  0.694  0.258  1.0
  O  O25  1  0.919  0.306  0.742  1.0
[/CIF]
.