The material structure described by KTe2O9 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 10-coordinate geometry to one O(2), one O(4), one O(6), one O(7), two equivalent O(5), two equivalent O(8), and two equivalent O(9) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to one O(2), one O(3), one O(4), one O(6), one O(8), and one O(9) atom to form corner-sharing TeO6 octahedra. The corner-sharing octahedral tilt angles are 51°. In the second Te site, Te(2) is bonded to one O(2), one O(3), one O(5), one O(7), and two equivalent O(1) atoms to form a mixture of edge and corner-sharing TeO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are nine inequivalent O sites. In the first O site, O(6) is bonded in a distorted single-bond geometry to one K(1) and one Te(1) atom. In the second O site, O(7) is bonded in a distorted single-bond geometry to one K(1) and one Te(2) atom. In the third O site, O(8) is bonded in a distorted bent 120 degrees geometry to two equivalent K(1) and one Te(1) atom. In the fourth O site, O(1) is bonded in a water-like geometry to two equivalent Te(2) atoms. In the fifth O site, O(9) is bonded in a 1-coordinate geometry to two equivalent K(1) and one Te(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Te(1), and one Te(2) atom. In the seventh O site, O(3) is bonded in a bent 120 degrees geometry to one Te(1) and one Te(2) atom. In the eighth O site, O(4) is bonded in a bent 120 degrees geometry to one K(1) and one Te(1) atom. In the ninth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Te(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KTe2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.802
_cell_length_b   5.431
_cell_length_c   16.632
_cell_angle_alpha   81.391
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   786.079
_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
  K  K0  1  0.100  0.514  0.785  1.0
  K  K1  1  0.600  0.486  0.715  1.0
  K  K2  1  0.900  0.486  0.215  1.0
  K  K3  1  0.400  0.514  0.285  1.0
  Te  Te4  1  0.799  0.959  0.891  1.0
  Te  Te5  1  0.299  0.041  0.609  1.0
  Te  Te6  1  0.201  0.041  0.109  1.0
  Te  Te7  1  0.701  0.959  0.391  1.0
  Te  Te8  1  0.917  0.864  0.573  1.0
  Te  Te9  1  0.417  0.136  0.927  1.0
  Te  Te10  1  0.083  0.136  0.427  1.0
  Te  Te11  1  0.583  0.864  0.073  1.0
  O  O12  1  0.054  0.791  0.484  1.0
  O  O13  1  0.554  0.209  0.016  1.0
  O  O14  1  0.946  0.209  0.516  1.0
  O  O15  1  0.446  0.791  0.984  1.0
  O  O16  1  0.600  0.097  0.858  1.0
  O  O17  1  0.100  0.903  0.642  1.0
  O  O18  1  0.400  0.903  0.142  1.0
  O  O19  1  0.900  0.097  0.358  1.0
  O  O20  1  0.737  0.823  0.503  1.0
  O  O21  1  0.237  0.177  0.997  1.0
  O  O22  1  0.263  0.177  0.497  1.0
  O  O23  1  0.763  0.823  0.003  1.0
  O  O24  1  0.011  0.847  0.892  1.0
  O  O25  1  0.511  0.153  0.608  1.0
  O  O26  1  0.989  0.153  0.108  1.0
  O  O27  1  0.489  0.847  0.392  1.0
  O  O28  1  0.889  0.541  0.632  1.0
  O  O29  1  0.389  0.459  0.868  1.0
  O  O30  1  0.111  0.459  0.368  1.0
  O  O31  1  0.611  0.541  0.132  1.0
  O  O32  1  0.885  0.274  0.913  1.0
  O  O33  1  0.385  0.726  0.587  1.0
  O  O34  1  0.115  0.726  0.087  1.0
  O  O35  1  0.615  0.274  0.413  1.0
  O  O36  1  0.785  0.928  0.658  1.0
  O  O37  1  0.285  0.072  0.842  1.0
  O  O38  1  0.215  0.072  0.342  1.0
  O  O39  1  0.715  0.928  0.158  1.0
  O  O40  1  0.894  0.116  0.789  1.0
  O  O41  1  0.394  0.884  0.711  1.0
  O  O42  1  0.106  0.884  0.211  1.0
  O  O43  1  0.606  0.116  0.289  1.0
  O  O44  1  0.762  0.656  0.847  1.0
  O  O45  1  0.262  0.344  0.653  1.0
  O  O46  1  0.238  0.344  0.153  1.0
  O  O47  1  0.738  0.656  0.347  1.0
[/CIF]
.
The material structure described by KTe2O9 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 10-coordinate geometry to one O(2), one O(4), one O(6), one O(7), two equivalent O(5), two equivalent O(8), and two equivalent O(9) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to one O(2), one O(3), one O(4), one O(6), one O(8), and one O(9) atom to form corner-sharing TeO6 octahedra. The corner-sharing octahedral tilt angles are 51°. In the second Te site, Te(2) is bonded to one O(2), one O(3), one O(5), one O(7), and two equivalent O(1) atoms to form a mixture of edge and corner-sharing TeO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are nine inequivalent O sites. In the first O site, O(6) is bonded in a distorted single-bond geometry to one K(1) and one Te(1) atom. In the second O site, O(7) is bonded in a distorted single-bond geometry to one K(1) and one Te(2) atom. In the third O site, O(8) is bonded in a distorted bent 120 degrees geometry to two equivalent K(1) and one Te(1) atom. In the fourth O site, O(1) is bonded in a water-like geometry to two equivalent Te(2) atoms. In the fifth O site, O(9) is bonded in a 1-coordinate geometry to two equivalent K(1) and one Te(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Te(1), and one Te(2) atom. In the seventh O site, O(3) is bonded in a bent 120 degrees geometry to one Te(1) and one Te(2) atom. In the eighth O site, O(4) is bonded in a bent 120 degrees geometry to one K(1) and one Te(1) atom. In the ninth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Te(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KTe2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.802
_cell_length_b   5.431
_cell_length_c   16.632
_cell_angle_alpha   81.391
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   786.079
_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
  K  K0  1  0.100  0.514  0.785  1.0
  K  K1  1  0.600  0.486  0.715  1.0
  K  K2  1  0.900  0.486  0.215  1.0
  K  K3  1  0.400  0.514  0.285  1.0
  Te  Te4  1  0.799  0.959  0.891  1.0
  Te  Te5  1  0.299  0.041  0.609  1.0
  Te  Te6  1  0.201  0.041  0.109  1.0
  Te  Te7  1  0.701  0.959  0.391  1.0
  Te  Te8  1  0.917  0.864  0.573  1.0
  Te  Te9  1  0.417  0.136  0.927  1.0
  Te  Te10  1  0.083  0.136  0.427  1.0
  Te  Te11  1  0.583  0.864  0.073  1.0
  O  O12  1  0.054  0.791  0.484  1.0
  O  O13  1  0.554  0.209  0.016  1.0
  O  O14  1  0.946  0.209  0.516  1.0
  O  O15  1  0.446  0.791  0.984  1.0
  O  O16  1  0.600  0.097  0.858  1.0
  O  O17  1  0.100  0.903  0.642  1.0
  O  O18  1  0.400  0.903  0.142  1.0
  O  O19  1  0.900  0.097  0.358  1.0
  O  O20  1  0.737  0.823  0.503  1.0
  O  O21  1  0.237  0.177  0.997  1.0
  O  O22  1  0.263  0.177  0.497  1.0
  O  O23  1  0.763  0.823  0.003  1.0
  O  O24  1  0.011  0.847  0.892  1.0
  O  O25  1  0.511  0.153  0.608  1.0
  O  O26  1  0.989  0.153  0.108  1.0
  O  O27  1  0.489  0.847  0.392  1.0
  O  O28  1  0.889  0.541  0.632  1.0
  O  O29  1  0.389  0.459  0.868  1.0
  O  O30  1  0.111  0.459  0.368  1.0
  O  O31  1  0.611  0.541  0.132  1.0
  O  O32  1  0.885  0.274  0.913  1.0
  O  O33  1  0.385  0.726  0.587  1.0
  O  O34  1  0.115  0.726  0.087  1.0
  O  O35  1  0.615  0.274  0.413  1.0
  O  O36  1  0.785  0.928  0.658  1.0
  O  O37  1  0.285  0.072  0.842  1.0
  O  O38  1  0.215  0.072  0.342  1.0
  O  O39  1  0.715  0.928  0.158  1.0
  O  O40  1  0.894  0.116  0.789  1.0
  O  O41  1  0.394  0.884  0.711  1.0
  O  O42  1  0.106  0.884  0.211  1.0
  O  O43  1  0.606  0.116  0.289  1.0
  O  O44  1  0.762  0.656  0.847  1.0
  O  O45  1  0.262  0.344  0.653  1.0
  O  O46  1  0.238  0.344  0.153  1.0
  O  O47  1  0.738  0.656  0.347  1.0
[/CIF]
.