The material described by K4Cu8Te11 crystallizes in the monoclinic C2/m space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one Te(7), two equivalent Te(3), two equivalent Te(6), and three equivalent Te(1) atoms. In the second K site, K(2) is bonded in a 16-coordinate geometry to two equivalent Cu(4), four equivalent Cu(3), one Te(8), two equivalent Te(2), two equivalent Te(3), two equivalent Te(5), and three equivalent Te(4) atoms. In the third K site, K(3) is bonded in a 10-coordinate geometry to two equivalent Cu(4), two equivalent Te(2), two equivalent Te(3), two equivalent Te(5), and two equivalent Te(6) atoms. In the fourth K site, K(4) is bonded in a 20-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(4), one Te(4), one Te(5), two equivalent Te(3), two equivalent Te(6), two equivalent Te(7), two equivalent Te(8), and two equivalent Te(9) atoms. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 4-coordinate geometry to one K(4), one Te(1), one Te(3), one Te(7), and one Te(9) atom. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to one K(4), one Te(1), one Te(6), one Te(7), and one Te(9) atom. In the third Cu site, Cu(3) is bonded in a 8-coordinate geometry to one K(4), two equivalent K(2), one Cu(3), one Te(3), one Te(8), and two equivalent Te(4) atoms. In the fourth Cu site, Cu(4) is bonded in a 8-coordinate geometry to one K(2), one K(3), one K(4), one Cu(4), one Te(2), one Te(5), one Te(6), and one Te(8) atom. There are nine inequivalent Te sites. In the first Te site, Te(7) is bonded in a 8-coordinate geometry to one K(1), two equivalent K(4), two equivalent Cu(1), two equivalent Cu(2), and one Te(7) atom. In the second Te site, Te(8) is bonded in a 8-coordinate geometry to one K(2), two equivalent K(4), two equivalent Cu(3), two equivalent Cu(4), and one Te(9) atom. In the third Te site, Te(5) is bonded in a 3-coordinate geometry to one K(4), two equivalent K(2), two equivalent K(3), and two equivalent Cu(4) atoms. In the fourth Te site, Te(9) is bonded in a 7-coordinate geometry to two equivalent K(4), two equivalent Cu(1), two equivalent Cu(2), and one Te(8) atom. In the fifth Te site, Te(6) is bonded in a 6-coordinate geometry to one K(1), one K(3), one K(4), one Cu(2), one Cu(4), and one Te(6) atom. In the sixth Te site, Te(1) is bonded to three equivalent K(1), two equivalent Cu(1), and two equivalent Cu(2) atoms to form a mixture of distorted corner and edge-sharing TeK3Cu4 pentagonal bipyramids. In the seventh Te site, Te(2) is bonded in a 7-coordinate geometry to two equivalent K(2), two equivalent K(3), two equivalent Cu(4), and one Te(2) atom. In the eighth Te site, Te(3) is bonded in a 7-coordinate geometry to one K(1), one K(2), one K(3), one K(4), one Cu(1), one Cu(3), and one Te(3) atom. In the ninth Te site, Te(4) is bonded in a 4-coordinate geometry to one K(4), three equivalent K(2), and four equivalent Cu(3) atoms. is represented by the CIF card [CIF]
data_K4Cu8Te11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.658
_cell_length_b   12.658
_cell_length_c   18.609
_cell_angle_alpha   57.048
_cell_angle_beta   57.048
_cell_angle_gamma   31.372
_symmetry_Int_Tables_number   1
_cell_volume   1280.785
_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  0.250  0.250  0.088  1.0
  K  K1  1  0.750  0.750  0.912  1.0
  K  K2  1  0.146  0.146  0.473  1.0
  K  K3  1  0.854  0.854  0.527  1.0
  K  K4  1  0.626  0.626  0.332  1.0
  K  K5  1  0.374  0.374  0.668  1.0
  K  K6  1  0.436  0.436  0.223  1.0
  K  K7  1  0.564  0.564  0.777  1.0
  Cu  Cu8  1  0.936  0.320  0.882  1.0
  Cu  Cu9  1  0.680  0.064  0.118  1.0
  Cu  Cu10  1  0.064  0.680  0.118  1.0
  Cu  Cu11  1  0.320  0.936  0.882  1.0
  Cu  Cu12  1  0.729  0.114  0.942  1.0
  Cu  Cu13  1  0.886  0.271  0.058  1.0
  Cu  Cu14  1  0.271  0.886  0.058  1.0
  Cu  Cu15  1  0.114  0.729  0.942  1.0
  Cu  Cu16  1  0.394  0.014  0.612  1.0
  Cu  Cu17  1  0.986  0.606  0.388  1.0
  Cu  Cu18  1  0.606  0.986  0.388  1.0
  Cu  Cu19  1  0.014  0.394  0.612  1.0
  Cu  Cu20  1  0.804  0.211  0.664  1.0
  Cu  Cu21  1  0.789  0.196  0.336  1.0
  Cu  Cu22  1  0.211  0.804  0.664  1.0
  Cu  Cu23  1  0.196  0.789  0.336  1.0
  Te  Te24  1  0.187  0.187  0.943  1.0
  Te  Te25  1  0.813  0.813  0.057  1.0
  Te  Te26  1  0.043  0.043  0.405  1.0
  Te  Te27  1  0.957  0.957  0.595  1.0
  Te  Te28  1  0.517  0.937  0.726  1.0
  Te  Te29  1  0.063  0.483  0.274  1.0
  Te  Te30  1  0.483  0.063  0.274  1.0
  Te  Te31  1  0.937  0.517  0.726  1.0
  Te  Te32  1  0.301  0.301  0.468  1.0
  Te  Te33  1  0.699  0.699  0.532  1.0
  Te  Te34  1  0.432  0.432  0.438  1.0
  Te  Te35  1  0.568  0.568  0.562  1.0
  Te  Te36  1  0.615  0.197  0.819  1.0
  Te  Te37  1  0.803  0.385  0.181  1.0
  Te  Te38  1  0.385  0.803  0.181  1.0
  Te  Te39  1  0.197  0.615  0.819  1.0
  Te  Te40  1  0.567  0.567  0.981  1.0
  Te  Te41  1  0.433  0.433  0.019  1.0
  Te  Te42  1  0.910  0.910  0.311  1.0
  Te  Te43  1  0.090  0.090  0.689  1.0
  Te  Te44  1  0.964  0.964  0.125  1.0
  Te  Te45  1  0.036  0.036  0.875  1.0
[/CIF]
.
The material described by K4Cu8Te11 crystallizes in the monoclinic C2/m space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one Te(7), two equivalent Te(3), two equivalent Te(6), and three equivalent Te(1) atoms. In the second K site, K(2) is bonded in a 16-coordinate geometry to two equivalent Cu(4), four equivalent Cu(3), one Te(8), two equivalent Te(2), two equivalent Te(3), two equivalent Te(5), and three equivalent Te(4) atoms. In the third K site, K(3) is bonded in a 10-coordinate geometry to two equivalent Cu(4), two equivalent Te(2), two equivalent Te(3), two equivalent Te(5), and two equivalent Te(6) atoms. In the fourth K site, K(4) is bonded in a 20-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), two equivalent Cu(3), two equivalent Cu(4), one Te(4), one Te(5), two equivalent Te(3), two equivalent Te(6), two equivalent Te(7), two equivalent Te(8), and two equivalent Te(9) atoms. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 4-coordinate geometry to one K(4), one Te(1), one Te(3), one Te(7), and one Te(9) atom. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to one K(4), one Te(1), one Te(6), one Te(7), and one Te(9) atom. In the third Cu site, Cu(3) is bonded in a 8-coordinate geometry to one K(4), two equivalent K(2), one Cu(3), one Te(3), one Te(8), and two equivalent Te(4) atoms. In the fourth Cu site, Cu(4) is bonded in a 8-coordinate geometry to one K(2), one K(3), one K(4), one Cu(4), one Te(2), one Te(5), one Te(6), and one Te(8) atom. There are nine inequivalent Te sites. In the first Te site, Te(7) is bonded in a 8-coordinate geometry to one K(1), two equivalent K(4), two equivalent Cu(1), two equivalent Cu(2), and one Te(7) atom. In the second Te site, Te(8) is bonded in a 8-coordinate geometry to one K(2), two equivalent K(4), two equivalent Cu(3), two equivalent Cu(4), and one Te(9) atom. In the third Te site, Te(5) is bonded in a 3-coordinate geometry to one K(4), two equivalent K(2), two equivalent K(3), and two equivalent Cu(4) atoms. In the fourth Te site, Te(9) is bonded in a 7-coordinate geometry to two equivalent K(4), two equivalent Cu(1), two equivalent Cu(2), and one Te(8) atom. In the fifth Te site, Te(6) is bonded in a 6-coordinate geometry to one K(1), one K(3), one K(4), one Cu(2), one Cu(4), and one Te(6) atom. In the sixth Te site, Te(1) is bonded to three equivalent K(1), two equivalent Cu(1), and two equivalent Cu(2) atoms to form a mixture of distorted corner and edge-sharing TeK3Cu4 pentagonal bipyramids. In the seventh Te site, Te(2) is bonded in a 7-coordinate geometry to two equivalent K(2), two equivalent K(3), two equivalent Cu(4), and one Te(2) atom. In the eighth Te site, Te(3) is bonded in a 7-coordinate geometry to one K(1), one K(2), one K(3), one K(4), one Cu(1), one Cu(3), and one Te(3) atom. In the ninth Te site, Te(4) is bonded in a 4-coordinate geometry to one K(4), three equivalent K(2), and four equivalent Cu(3) atoms. is represented by the CIF card [CIF]
data_K4Cu8Te11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.658
_cell_length_b   12.658
_cell_length_c   18.609
_cell_angle_alpha   57.048
_cell_angle_beta   57.048
_cell_angle_gamma   31.372
_symmetry_Int_Tables_number   1
_cell_volume   1280.785
_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  0.250  0.250  0.088  1.0
  K  K1  1  0.750  0.750  0.912  1.0
  K  K2  1  0.146  0.146  0.473  1.0
  K  K3  1  0.854  0.854  0.527  1.0
  K  K4  1  0.626  0.626  0.332  1.0
  K  K5  1  0.374  0.374  0.668  1.0
  K  K6  1  0.436  0.436  0.223  1.0
  K  K7  1  0.564  0.564  0.777  1.0
  Cu  Cu8  1  0.936  0.320  0.882  1.0
  Cu  Cu9  1  0.680  0.064  0.118  1.0
  Cu  Cu10  1  0.064  0.680  0.118  1.0
  Cu  Cu11  1  0.320  0.936  0.882  1.0
  Cu  Cu12  1  0.729  0.114  0.942  1.0
  Cu  Cu13  1  0.886  0.271  0.058  1.0
  Cu  Cu14  1  0.271  0.886  0.058  1.0
  Cu  Cu15  1  0.114  0.729  0.942  1.0
  Cu  Cu16  1  0.394  0.014  0.612  1.0
  Cu  Cu17  1  0.986  0.606  0.388  1.0
  Cu  Cu18  1  0.606  0.986  0.388  1.0
  Cu  Cu19  1  0.014  0.394  0.612  1.0
  Cu  Cu20  1  0.804  0.211  0.664  1.0
  Cu  Cu21  1  0.789  0.196  0.336  1.0
  Cu  Cu22  1  0.211  0.804  0.664  1.0
  Cu  Cu23  1  0.196  0.789  0.336  1.0
  Te  Te24  1  0.187  0.187  0.943  1.0
  Te  Te25  1  0.813  0.813  0.057  1.0
  Te  Te26  1  0.043  0.043  0.405  1.0
  Te  Te27  1  0.957  0.957  0.595  1.0
  Te  Te28  1  0.517  0.937  0.726  1.0
  Te  Te29  1  0.063  0.483  0.274  1.0
  Te  Te30  1  0.483  0.063  0.274  1.0
  Te  Te31  1  0.937  0.517  0.726  1.0
  Te  Te32  1  0.301  0.301  0.468  1.0
  Te  Te33  1  0.699  0.699  0.532  1.0
  Te  Te34  1  0.432  0.432  0.438  1.0
  Te  Te35  1  0.568  0.568  0.562  1.0
  Te  Te36  1  0.615  0.197  0.819  1.0
  Te  Te37  1  0.803  0.385  0.181  1.0
  Te  Te38  1  0.385  0.803  0.181  1.0
  Te  Te39  1  0.197  0.615  0.819  1.0
  Te  Te40  1  0.567  0.567  0.981  1.0
  Te  Te41  1  0.433  0.433  0.019  1.0
  Te  Te42  1  0.910  0.910  0.311  1.0
  Te  Te43  1  0.090  0.090  0.689  1.0
  Te  Te44  1  0.964  0.964  0.125  1.0
  Te  Te45  1  0.036  0.036  0.875  1.0
[/CIF]
.