The material described by K4PbO4 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) 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 second K site, K(2) is bonded to one O(2), two equivalent O(3), and two equivalent O(4) atoms to form KO5 square pyramids that share  a cornercorner with one Pb(1)O4 tetrahedra, corners with three equivalent K(3)O5 trigonal bipyramids, corners with two equivalent K(4)O4 trigonal pyramids, edges with two equivalent K(2)O5 square pyramids, edges with two equivalent Pb(1)O4 tetrahedra, and edges with three equivalent K(3)O5 trigonal bipyramids. In the third K site, K(3) is bonded to one O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted KO5 trigonal bipyramids that share corners with three equivalent K(2)O5 square pyramids, corners with three equivalent Pb(1)O4 tetrahedra, corners with two equivalent K(4)O4 trigonal pyramids, edges with three equivalent K(2)O5 square pyramids,  an edgeedge with one Pb(1)O4 tetrahedra, and edges with two equivalent K(3)O5 trigonal bipyramids. In the fourth K site, K(4) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form distorted KO4 trigonal pyramids that share corners with two equivalent K(2)O5 square pyramids, corners with four equivalent Pb(1)O4 tetrahedra, corners with two equivalent K(3)O5 trigonal bipyramids, and edges with two equivalent K(4)O4 trigonal 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 K(2)O5 square pyramid, corners with three equivalent K(3)O5 trigonal bipyramids, corners with four equivalent K(4)O4 trigonal pyramids, edges with two equivalent K(2)O5 square pyramids, and  an edgeedge with one K(3)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent K(1), two equivalent K(4), and one Pb(1) atom. In the second O site, O(2) is bonded to one K(1), one K(2), one K(3), two equivalent K(4), and one Pb(1) atom to form a mixture of corner and edge-sharing OK5Pb octahedra. The corner-sharing octahedral tilt angles range from 15-19°. In the third O site, O(3) is bonded to one K(1), two equivalent K(2), two equivalent K(3), and one Pb(1) atom to form a mixture of corner and edge-sharing OK5Pb octahedra. The corner-sharing octahedral tilt angles range from 8-27°. In the fourth O site, O(4) is bonded to one K(1), two equivalent K(2), two equivalent K(3), and one Pb(1) atom to form a mixture of distorted corner and edge-sharing OK5Pb octahedra. The corner-sharing octahedral tilt angles range from 8-27°. is represented by the CIF card [CIF]
data_K4PbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.596
_cell_length_b   6.595
_cell_length_c   9.873
_cell_angle_alpha   71.626
_cell_angle_beta   79.597
_cell_angle_gamma   67.557
_symmetry_Int_Tables_number   1
_cell_volume   375.815
_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  0.248  0.585  0.674  1.0
  K  K1  1  0.752  0.415  0.326  1.0
  K  K2  1  0.728  0.957  0.113  1.0
  K  K3  1  0.272  0.043  0.887  1.0
  K  K4  1  0.773  0.513  0.937  1.0
  K  K5  1  0.227  0.487  0.063  1.0
  K  K6  1  0.746  0.761  0.523  1.0
  K  K7  1  0.254  0.239  0.477  1.0
  Pb  Pb8  1  0.781  0.153  0.745  1.0
  Pb  Pb9  1  0.219  0.847  0.255  1.0
  O  O10  1  0.627  0.160  0.577  1.0
  O  O11  1  0.373  0.840  0.423  1.0
  O  O12  1  0.975  0.358  0.694  1.0
  O  O13  1  0.025  0.642  0.306  1.0
  O  O14  1  0.525  0.297  0.884  1.0
  O  O15  1  0.475  0.703  0.116  1.0
  O  O16  1  0.978  0.830  0.859  1.0
  O  O17  1  0.022  0.170  0.141  1.0
[/CIF]
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The material described by K4PbO4 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) 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 second K site, K(2) is bonded to one O(2), two equivalent O(3), and two equivalent O(4) atoms to form KO5 square pyramids that share  a cornercorner with one Pb(1)O4 tetrahedra, corners with three equivalent K(3)O5 trigonal bipyramids, corners with two equivalent K(4)O4 trigonal pyramids, edges with two equivalent K(2)O5 square pyramids, edges with two equivalent Pb(1)O4 tetrahedra, and edges with three equivalent K(3)O5 trigonal bipyramids. In the third K site, K(3) is bonded to one O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted KO5 trigonal bipyramids that share corners with three equivalent K(2)O5 square pyramids, corners with three equivalent Pb(1)O4 tetrahedra, corners with two equivalent K(4)O4 trigonal pyramids, edges with three equivalent K(2)O5 square pyramids,  an edgeedge with one Pb(1)O4 tetrahedra, and edges with two equivalent K(3)O5 trigonal bipyramids. In the fourth K site, K(4) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form distorted KO4 trigonal pyramids that share corners with two equivalent K(2)O5 square pyramids, corners with four equivalent Pb(1)O4 tetrahedra, corners with two equivalent K(3)O5 trigonal bipyramids, and edges with two equivalent K(4)O4 trigonal 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 K(2)O5 square pyramid, corners with three equivalent K(3)O5 trigonal bipyramids, corners with four equivalent K(4)O4 trigonal pyramids, edges with two equivalent K(2)O5 square pyramids, and  an edgeedge with one K(3)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent K(1), two equivalent K(4), and one Pb(1) atom. In the second O site, O(2) is bonded to one K(1), one K(2), one K(3), two equivalent K(4), and one Pb(1) atom to form a mixture of corner and edge-sharing OK5Pb octahedra. The corner-sharing octahedral tilt angles range from 15-19°. In the third O site, O(3) is bonded to one K(1), two equivalent K(2), two equivalent K(3), and one Pb(1) atom to form a mixture of corner and edge-sharing OK5Pb octahedra. The corner-sharing octahedral tilt angles range from 8-27°. In the fourth O site, O(4) is bonded to one K(1), two equivalent K(2), two equivalent K(3), and one Pb(1) atom to form a mixture of distorted corner and edge-sharing OK5Pb octahedra. The corner-sharing octahedral tilt angles range from 8-27°. is represented by the CIF card [CIF]
data_K4PbO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.596
_cell_length_b   6.595
_cell_length_c   9.873
_cell_angle_alpha   71.626
_cell_angle_beta   79.597
_cell_angle_gamma   67.557
_symmetry_Int_Tables_number   1
_cell_volume   375.815
_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  0.248  0.585  0.674  1.0
  K  K1  1  0.752  0.415  0.326  1.0
  K  K2  1  0.728  0.957  0.113  1.0
  K  K3  1  0.272  0.043  0.887  1.0
  K  K4  1  0.773  0.513  0.937  1.0
  K  K5  1  0.227  0.487  0.063  1.0
  K  K6  1  0.746  0.761  0.523  1.0
  K  K7  1  0.254  0.239  0.477  1.0
  Pb  Pb8  1  0.781  0.153  0.745  1.0
  Pb  Pb9  1  0.219  0.847  0.255  1.0
  O  O10  1  0.627  0.160  0.577  1.0
  O  O11  1  0.373  0.840  0.423  1.0
  O  O12  1  0.975  0.358  0.694  1.0
  O  O13  1  0.025  0.642  0.306  1.0
  O  O14  1  0.525  0.297  0.884  1.0
  O  O15  1  0.475  0.703  0.116  1.0
  O  O16  1  0.978  0.830  0.859  1.0
  O  O17  1  0.022  0.170  0.141  1.0
[/CIF]
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