The material described by K2CuTeO7 crystallizes in the monoclinic Cc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), two equivalent O(3), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(7) atoms. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. Te(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(2), two equivalent K(1), one Cu(1), and one Te(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one K(2), and one Te(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Te(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent K(2) atoms. is represented by the CIF file [CIF]
data_K2CuTeO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.680
_cell_length_b   5.680
_cell_length_c   11.902
_cell_angle_alpha   88.209
_cell_angle_beta   88.209
_cell_angle_gamma   70.500
_symmetry_Int_Tables_number   1
_cell_volume   361.700
_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  0.088  0.529  0.822  1.0
  K  K1  1  0.529  0.088  0.322  1.0
  K  K2  1  0.950  0.491  0.179  1.0
  K  K3  1  0.491  0.950  0.679  1.0
  Cu  Cu4  1  0.012  0.995  0.497  1.0
  Cu  Cu5  1  0.995  0.012  0.997  1.0
  Te  Te6  1  0.997  0.500  0.498  1.0
  Te  Te7  1  0.500  0.997  0.998  1.0
  O  O8  1  0.996  0.225  0.605  1.0
  O  O9  1  0.225  0.996  0.105  1.0
  O  O10  1  0.026  0.761  0.388  1.0
  O  O11  1  0.761  0.026  0.888  1.0
  O  O12  1  0.009  0.240  0.390  1.0
  O  O13  1  0.240  0.009  0.890  1.0
  O  O14  1  0.992  0.761  0.605  1.0
  O  O15  1  0.761  0.992  0.105  1.0
  O  O16  1  0.356  0.350  0.516  1.0
  O  O17  1  0.350  0.356  0.016  1.0
  O  O18  1  0.640  0.650  0.490  1.0
  O  O19  1  0.650  0.640  0.990  1.0
  O  O20  1  0.638  0.414  0.783  1.0
  O  O21  1  0.414  0.638  0.283  1.0
[/CIF]
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The material described by K2CuTeO7 crystallizes in the monoclinic Cc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), two equivalent O(3), and two equivalent O(7) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(7) atoms. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. Te(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(2), two equivalent K(1), one Cu(1), and one Te(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Cu(1), and one Te(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one K(2), and one Te(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Te(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent K(2) atoms. is represented by the CIF file [CIF]
data_K2CuTeO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.680
_cell_length_b   5.680
_cell_length_c   11.902
_cell_angle_alpha   88.209
_cell_angle_beta   88.209
_cell_angle_gamma   70.500
_symmetry_Int_Tables_number   1
_cell_volume   361.700
_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  0.088  0.529  0.822  1.0
  K  K1  1  0.529  0.088  0.322  1.0
  K  K2  1  0.950  0.491  0.179  1.0
  K  K3  1  0.491  0.950  0.679  1.0
  Cu  Cu4  1  0.012  0.995  0.497  1.0
  Cu  Cu5  1  0.995  0.012  0.997  1.0
  Te  Te6  1  0.997  0.500  0.498  1.0
  Te  Te7  1  0.500  0.997  0.998  1.0
  O  O8  1  0.996  0.225  0.605  1.0
  O  O9  1  0.225  0.996  0.105  1.0
  O  O10  1  0.026  0.761  0.388  1.0
  O  O11  1  0.761  0.026  0.888  1.0
  O  O12  1  0.009  0.240  0.390  1.0
  O  O13  1  0.240  0.009  0.890  1.0
  O  O14  1  0.992  0.761  0.605  1.0
  O  O15  1  0.761  0.992  0.105  1.0
  O  O16  1  0.356  0.350  0.516  1.0
  O  O17  1  0.350  0.356  0.016  1.0
  O  O18  1  0.640  0.650  0.490  1.0
  O  O19  1  0.650  0.640  0.990  1.0
  O  O20  1  0.638  0.414  0.783  1.0
  O  O21  1  0.414  0.638  0.283  1.0
[/CIF]
.