The crystal structure described by K2AsTe2 crystallizes in the orthorhombic Pnma space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one As(2), two equivalent Te(2), and four equivalent Te(1) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one As(1), two equivalent Te(1), and four equivalent Te(2) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to two equivalent Te(1) and four equivalent Te(2) atoms. In the fourth K site, K(4) is bonded in a 7-coordinate geometry to one As(2), two equivalent Te(2), and four equivalent Te(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded to one K(2), one As(2), and two equivalent Te(1) atoms to form AsKTe2As trigonal pyramids that share corners with two equivalent Te(1)K6As pentagonal bipyramids. In the second As site, As(2) is bonded to one K(1), one K(4), one As(1), and two equivalent Te(2) atoms to form AsK2Te2As trigonal bipyramids that share corners with two equivalent Te(1)K6As pentagonal bipyramids and edges with four equivalent Te(1)K6As pentagonal bipyramids. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to one K(2), one K(3), two equivalent K(1), two equivalent K(4), and one As(1) atom to form distorted TeK6As pentagonal bipyramids that share corners with four equivalent Te(1)K6As pentagonal bipyramids,  a cornercorner with one As(2)K2Te2As trigonal bipyramid,  a cornercorner with one As(1)KTe2As trigonal pyramid, edges with two equivalent Te(1)K6As pentagonal bipyramids, edges with two equivalent As(2)K2Te2As trigonal bipyramids, and faces with two equivalent Te(1)K6As pentagonal bipyramids. In the second Te site, Te(2) is bonded in a 7-coordinate geometry to one K(1), one K(4), two equivalent K(2), two equivalent K(3), and one As(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Te2As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.347
_cell_length_b   9.116
_cell_length_c   20.170
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1534.795
_cell_formula_units_Z   8
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  0.420  0.543  1.0
  K  K1  1  0.750  0.580  0.457  1.0
  K  K2  1  0.750  0.920  0.957  1.0
  K  K3  1  0.250  0.080  0.043  1.0
  K  K4  1  0.250  0.499  0.189  1.0
  K  K5  1  0.750  0.501  0.811  1.0
  K  K6  1  0.750  0.999  0.311  1.0
  K  K7  1  0.250  0.001  0.689  1.0
  K  K8  1  0.250  0.604  0.716  1.0
  K  K9  1  0.750  0.396  0.284  1.0
  K  K10  1  0.750  0.104  0.784  1.0
  K  K11  1  0.250  0.896  0.216  1.0
  K  K12  1  0.250  0.924  0.442  1.0
  K  K13  1  0.750  0.076  0.558  1.0
  K  K14  1  0.750  0.424  0.058  1.0
  K  K15  1  0.250  0.576  0.942  1.0
  Te  Te16  1  0.998  0.239  0.418  1.0
  Te  Te17  1  0.498  0.761  0.582  1.0
  Te  Te18  1  0.002  0.739  0.082  1.0
  Te  Te19  1  0.502  0.261  0.918  1.0
  Te  Te20  1  0.002  0.761  0.582  1.0
  Te  Te21  1  0.502  0.239  0.418  1.0
  Te  Te22  1  0.998  0.261  0.918  1.0
  Te  Te23  1  0.498  0.739  0.082  1.0
  Te  Te24  1  0.991  0.182  0.179  1.0
  Te  Te25  1  0.491  0.818  0.821  1.0
  Te  Te26  1  0.009  0.682  0.321  1.0
  Te  Te27  1  0.509  0.318  0.679  1.0
  Te  Te28  1  0.009  0.818  0.821  1.0
  Te  Te29  1  0.509  0.182  0.179  1.0
  Te  Te30  1  0.991  0.318  0.679  1.0
  Te  Te31  1  0.491  0.682  0.321  1.0
  As  As32  1  0.250  0.314  0.349  1.0
  As  As33  1  0.750  0.686  0.651  1.0
  As  As34  1  0.750  0.814  0.151  1.0
  As  As35  1  0.250  0.186  0.849  1.0
  As  As36  1  0.250  0.574  0.387  1.0
  As  As37  1  0.750  0.426  0.613  1.0
  As  As38  1  0.750  0.074  0.113  1.0
  As  As39  1  0.250  0.926  0.887  1.0
[/CIF]
.
The crystal structure described by K2AsTe2 crystallizes in the orthorhombic Pnma space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one As(2), two equivalent Te(2), and four equivalent Te(1) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one As(1), two equivalent Te(1), and four equivalent Te(2) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to two equivalent Te(1) and four equivalent Te(2) atoms. In the fourth K site, K(4) is bonded in a 7-coordinate geometry to one As(2), two equivalent Te(2), and four equivalent Te(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded to one K(2), one As(2), and two equivalent Te(1) atoms to form AsKTe2As trigonal pyramids that share corners with two equivalent Te(1)K6As pentagonal bipyramids. In the second As site, As(2) is bonded to one K(1), one K(4), one As(1), and two equivalent Te(2) atoms to form AsK2Te2As trigonal bipyramids that share corners with two equivalent Te(1)K6As pentagonal bipyramids and edges with four equivalent Te(1)K6As pentagonal bipyramids. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to one K(2), one K(3), two equivalent K(1), two equivalent K(4), and one As(1) atom to form distorted TeK6As pentagonal bipyramids that share corners with four equivalent Te(1)K6As pentagonal bipyramids,  a cornercorner with one As(2)K2Te2As trigonal bipyramid,  a cornercorner with one As(1)KTe2As trigonal pyramid, edges with two equivalent Te(1)K6As pentagonal bipyramids, edges with two equivalent As(2)K2Te2As trigonal bipyramids, and faces with two equivalent Te(1)K6As pentagonal bipyramids. In the second Te site, Te(2) is bonded in a 7-coordinate geometry to one K(1), one K(4), two equivalent K(2), two equivalent K(3), and one As(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Te2As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.347
_cell_length_b   9.116
_cell_length_c   20.170
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1534.795
_cell_formula_units_Z   8
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  0.420  0.543  1.0
  K  K1  1  0.750  0.580  0.457  1.0
  K  K2  1  0.750  0.920  0.957  1.0
  K  K3  1  0.250  0.080  0.043  1.0
  K  K4  1  0.250  0.499  0.189  1.0
  K  K5  1  0.750  0.501  0.811  1.0
  K  K6  1  0.750  0.999  0.311  1.0
  K  K7  1  0.250  0.001  0.689  1.0
  K  K8  1  0.250  0.604  0.716  1.0
  K  K9  1  0.750  0.396  0.284  1.0
  K  K10  1  0.750  0.104  0.784  1.0
  K  K11  1  0.250  0.896  0.216  1.0
  K  K12  1  0.250  0.924  0.442  1.0
  K  K13  1  0.750  0.076  0.558  1.0
  K  K14  1  0.750  0.424  0.058  1.0
  K  K15  1  0.250  0.576  0.942  1.0
  Te  Te16  1  0.998  0.239  0.418  1.0
  Te  Te17  1  0.498  0.761  0.582  1.0
  Te  Te18  1  0.002  0.739  0.082  1.0
  Te  Te19  1  0.502  0.261  0.918  1.0
  Te  Te20  1  0.002  0.761  0.582  1.0
  Te  Te21  1  0.502  0.239  0.418  1.0
  Te  Te22  1  0.998  0.261  0.918  1.0
  Te  Te23  1  0.498  0.739  0.082  1.0
  Te  Te24  1  0.991  0.182  0.179  1.0
  Te  Te25  1  0.491  0.818  0.821  1.0
  Te  Te26  1  0.009  0.682  0.321  1.0
  Te  Te27  1  0.509  0.318  0.679  1.0
  Te  Te28  1  0.009  0.818  0.821  1.0
  Te  Te29  1  0.509  0.182  0.179  1.0
  Te  Te30  1  0.991  0.318  0.679  1.0
  Te  Te31  1  0.491  0.682  0.321  1.0
  As  As32  1  0.250  0.314  0.349  1.0
  As  As33  1  0.750  0.686  0.651  1.0
  As  As34  1  0.750  0.814  0.151  1.0
  As  As35  1  0.250  0.186  0.849  1.0
  As  As36  1  0.250  0.574  0.387  1.0
  As  As37  1  0.750  0.426  0.613  1.0
  As  As38  1  0.750  0.074  0.113  1.0
  As  As39  1  0.250  0.926  0.887  1.0
[/CIF]
.