The structure described by Pb2KTa5O15 crystallizes in the orthorhombic Pmc2_1 space group. K(1) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(2), and two equivalent O(3) atoms. There are five inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(12), one O(14), one O(9), and two equivalent O(5) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 1-36°. In the second Ta site, Ta(2) is bonded to one O(10), one O(13), one O(15), one O(2), and two equivalent O(6) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-30°. In the third Ta site, Ta(3) is bonded to one O(13), one O(14), one O(3), one O(9), and two equivalent O(7) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 3-35°. In the fourth Ta site, Ta(4) is bonded to one O(10), one O(12), one O(15), one O(4), and two equivalent O(8) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-39°. In the fifth Ta site, Ta(5) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(11) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 14-39°. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 12-coordinate geometry to one O(5), one O(6), one O(7), one O(8), two equivalent O(12), two equivalent O(13), two equivalent O(14), and two equivalent O(15) atoms. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(11) and two equivalent O(4) atoms. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(5) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Ta(2), and one Ta(5) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Ta(3), and one Ta(5) atom. In the fourth O site, O(4) is bonded to one Ta(4), one Ta(5), and two equivalent Pb(2) atoms to form distorted corner-sharing OTa2Pb2 tetrahedra. In the fifth O site, O(5) is bonded in a linear geometry to two equivalent Ta(1) and one Pb(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to two equivalent Ta(2) and one Pb(1) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to two equivalent Ta(3) and one Pb(1) atom. In the eighth O site, O(8) is bonded in a linear geometry to two equivalent Ta(4) and one Pb(1) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(3) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Ta(2), and one Ta(4) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to two equivalent Ta(5) and one Pb(2) atom. In the twelfth O site, O(12) is bonded in a linear geometry to one Ta(1), one Ta(4), and two equivalent Pb(1) atoms. In the thirteenth O site, O(13) is bonded in a linear geometry to one Ta(2), one Ta(3), and two equivalent Pb(1) atoms. In the fourteenth O site, O(14) is bonded in a distorted linear geometry to one Ta(1), one Ta(3), and two equivalent Pb(1) atoms. In the fifteenth O site, O(15) is bonded in a linear geometry to one Ta(2), one Ta(4), and two equivalent Pb(1) atoms. is represented by the CIF card [CIF]
data_KTa5Pb2O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.972
_cell_length_b   12.730
_cell_length_c   12.761
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   645.273
_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  0.500  0.923  0.676  1.0
  K  K1  1  0.500  0.077  0.176  1.0
  Ta  Ta2  1  0.000  0.464  0.575  1.0
  Ta  Ta3  1  0.000  0.038  0.422  1.0
  Ta  Ta4  1  0.000  0.536  0.075  1.0
  Ta  Ta5  1  0.000  0.962  0.922  1.0
  Ta  Ta6  1  0.000  0.330  0.289  1.0
  Ta  Ta7  1  0.000  0.174  0.708  1.0
  Ta  Ta8  1  0.000  0.826  0.208  1.0
  Ta  Ta9  1  0.000  0.670  0.789  1.0
  Ta  Ta10  1  0.000  0.753  0.505  1.0
  Ta  Ta11  1  0.000  0.247  0.005  1.0
  Pb  Pb12  1  0.500  0.253  0.495  1.0
  Pb  Pb13  1  0.500  0.747  0.995  1.0
  Pb  Pb14  1  0.500  0.380  0.831  1.0
  Pb  Pb15  1  0.500  0.620  0.331  1.0
  O  O16  1  0.000  0.593  0.494  1.0
  O  O17  1  0.000  0.904  0.502  1.0
  O  O18  1  0.000  0.407  0.994  1.0
  O  O19  1  0.000  0.096  0.002  1.0
  O  O20  1  0.000  0.251  0.155  1.0
  O  O21  1  0.000  0.263  0.842  1.0
  O  O22  1  0.000  0.737  0.342  1.0
  O  O23  1  0.000  0.749  0.655  1.0
  O  O24  1  0.500  0.454  0.577  1.0
  O  O25  1  0.500  0.047  0.426  1.0
  O  O26  1  0.500  0.546  0.077  1.0
  O  O27  1  0.500  0.953  0.926  1.0
  O  O28  1  0.500  0.325  0.298  1.0
  O  O29  1  0.500  0.181  0.711  1.0
  O  O30  1  0.500  0.819  0.211  1.0
  O  O31  1  0.500  0.675  0.798  1.0
  O  O32  1  0.000  0.535  0.715  1.0
  O  O33  1  0.000  0.960  0.289  1.0
  O  O34  1  0.000  0.465  0.215  1.0
  O  O35  1  0.000  0.040  0.789  1.0
  O  O36  1  0.500  0.743  0.489  1.0
  O  O37  1  0.500  0.257  0.989  1.0
  O  O38  1  0.000  0.318  0.641  1.0
  O  O39  1  0.000  0.182  0.361  1.0
  O  O40  1  0.000  0.682  0.141  1.0
  O  O41  1  0.000  0.818  0.861  1.0
  O  O42  1  0.000  0.386  0.435  1.0
  O  O43  1  0.000  0.109  0.570  1.0
  O  O44  1  0.000  0.891  0.070  1.0
  O  O45  1  0.000  0.614  0.935  1.0
[/CIF]
.
The structure described by Pb2KTa5O15 crystallizes in the orthorhombic Pmc2_1 space group. K(1) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(2), and two equivalent O(3) atoms. There are five inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(12), one O(14), one O(9), and two equivalent O(5) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 1-36°. In the second Ta site, Ta(2) is bonded to one O(10), one O(13), one O(15), one O(2), and two equivalent O(6) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-30°. In the third Ta site, Ta(3) is bonded to one O(13), one O(14), one O(3), one O(9), and two equivalent O(7) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 3-35°. In the fourth Ta site, Ta(4) is bonded to one O(10), one O(12), one O(15), one O(4), and two equivalent O(8) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-39°. In the fifth Ta site, Ta(5) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(11) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 14-39°. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 12-coordinate geometry to one O(5), one O(6), one O(7), one O(8), two equivalent O(12), two equivalent O(13), two equivalent O(14), and two equivalent O(15) atoms. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(11) and two equivalent O(4) atoms. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(5) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Ta(2), and one Ta(5) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Ta(3), and one Ta(5) atom. In the fourth O site, O(4) is bonded to one Ta(4), one Ta(5), and two equivalent Pb(2) atoms to form distorted corner-sharing OTa2Pb2 tetrahedra. In the fifth O site, O(5) is bonded in a linear geometry to two equivalent Ta(1) and one Pb(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to two equivalent Ta(2) and one Pb(1) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to two equivalent Ta(3) and one Pb(1) atom. In the eighth O site, O(8) is bonded in a linear geometry to two equivalent Ta(4) and one Pb(1) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(3) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Ta(2), and one Ta(4) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to two equivalent Ta(5) and one Pb(2) atom. In the twelfth O site, O(12) is bonded in a linear geometry to one Ta(1), one Ta(4), and two equivalent Pb(1) atoms. In the thirteenth O site, O(13) is bonded in a linear geometry to one Ta(2), one Ta(3), and two equivalent Pb(1) atoms. In the fourteenth O site, O(14) is bonded in a distorted linear geometry to one Ta(1), one Ta(3), and two equivalent Pb(1) atoms. In the fifteenth O site, O(15) is bonded in a linear geometry to one Ta(2), one Ta(4), and two equivalent Pb(1) atoms. is represented by the CIF card [CIF]
data_KTa5Pb2O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.972
_cell_length_b   12.730
_cell_length_c   12.761
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   645.273
_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  0.500  0.923  0.676  1.0
  K  K1  1  0.500  0.077  0.176  1.0
  Ta  Ta2  1  0.000  0.464  0.575  1.0
  Ta  Ta3  1  0.000  0.038  0.422  1.0
  Ta  Ta4  1  0.000  0.536  0.075  1.0
  Ta  Ta5  1  0.000  0.962  0.922  1.0
  Ta  Ta6  1  0.000  0.330  0.289  1.0
  Ta  Ta7  1  0.000  0.174  0.708  1.0
  Ta  Ta8  1  0.000  0.826  0.208  1.0
  Ta  Ta9  1  0.000  0.670  0.789  1.0
  Ta  Ta10  1  0.000  0.753  0.505  1.0
  Ta  Ta11  1  0.000  0.247  0.005  1.0
  Pb  Pb12  1  0.500  0.253  0.495  1.0
  Pb  Pb13  1  0.500  0.747  0.995  1.0
  Pb  Pb14  1  0.500  0.380  0.831  1.0
  Pb  Pb15  1  0.500  0.620  0.331  1.0
  O  O16  1  0.000  0.593  0.494  1.0
  O  O17  1  0.000  0.904  0.502  1.0
  O  O18  1  0.000  0.407  0.994  1.0
  O  O19  1  0.000  0.096  0.002  1.0
  O  O20  1  0.000  0.251  0.155  1.0
  O  O21  1  0.000  0.263  0.842  1.0
  O  O22  1  0.000  0.737  0.342  1.0
  O  O23  1  0.000  0.749  0.655  1.0
  O  O24  1  0.500  0.454  0.577  1.0
  O  O25  1  0.500  0.047  0.426  1.0
  O  O26  1  0.500  0.546  0.077  1.0
  O  O27  1  0.500  0.953  0.926  1.0
  O  O28  1  0.500  0.325  0.298  1.0
  O  O29  1  0.500  0.181  0.711  1.0
  O  O30  1  0.500  0.819  0.211  1.0
  O  O31  1  0.500  0.675  0.798  1.0
  O  O32  1  0.000  0.535  0.715  1.0
  O  O33  1  0.000  0.960  0.289  1.0
  O  O34  1  0.000  0.465  0.215  1.0
  O  O35  1  0.000  0.040  0.789  1.0
  O  O36  1  0.500  0.743  0.489  1.0
  O  O37  1  0.500  0.257  0.989  1.0
  O  O38  1  0.000  0.318  0.641  1.0
  O  O39  1  0.000  0.182  0.361  1.0
  O  O40  1  0.000  0.682  0.141  1.0
  O  O41  1  0.000  0.818  0.861  1.0
  O  O42  1  0.000  0.386  0.435  1.0
  O  O43  1  0.000  0.109  0.570  1.0
  O  O44  1  0.000  0.891  0.070  1.0
  O  O45  1  0.000  0.614  0.935  1.0
[/CIF]
.