The material described by KTa(AgSe2)2 crystallizes in the orthorhombic Ama2 space group. K(1) is bonded in a 5-coordinate geometry to one Se(1), two equivalent Se(2), and two equivalent Se(3) atoms. Ta(1) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form TaSe4 tetrahedra that share edges with two equivalent Ag(1)Se4 tetrahedra and edges with two equivalent Ag(2)Se4 tetrahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form distorted AgSe4 tetrahedra that share corners with two equivalent Ag(1)Se4 tetrahedra, corners with four equivalent Ag(2)Se4 tetrahedra, and edges with two equivalent Ta(1)Se4 tetrahedra. In the second Ag site, Ag(2) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form distorted AgSe4 tetrahedra that share corners with four equivalent Ag(1)Se4 tetrahedra and edges with two equivalent Ta(1)Se4 tetrahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 5-coordinate geometry to one K(1), one Ta(1), one Ag(2), and two equivalent Ag(1) atoms. In the second Se site, Se(2) is bonded in a 4-coordinate geometry to one K(1), one Ta(1), one Ag(1), and one Ag(2) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1), one Ta(1), and one Ag(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KTa(AgSe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.421
_cell_length_b   10.421
_cell_length_c   8.376
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   145.592
_symmetry_Int_Tables_number   1
_cell_volume   513.969
_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  0.454  0.822  0.750  1.0
  K  K1  1  0.822  0.454  0.250  1.0
  Ta  Ta2  1  0.523  0.297  0.750  1.0
  Ta  Ta3  1  0.297  0.523  0.250  1.0
  Ag  Ag4  1  0.374  0.374  0.000  1.0
  Ag  Ag5  1  0.374  0.374  0.500  1.0
  Ag  Ag6  1  0.025  0.796  0.750  1.0
  Ag  Ag7  1  0.796  0.025  0.250  1.0
  Se  Se8  1  0.651  0.631  0.750  1.0
  Se  Se9  1  0.631  0.651  0.250  1.0
  Se  Se10  1  0.307  0.068  0.994  1.0
  Se  Se11  1  0.068  0.307  0.494  1.0
  Se  Se12  1  0.411  0.839  0.250  1.0
  Se  Se13  1  0.068  0.307  0.006  1.0
  Se  Se14  1  0.307  0.068  0.506  1.0
  Se  Se15  1  0.839  0.411  0.750  1.0
[/CIF]
.
The material described by KTa(AgSe2)2 crystallizes in the orthorhombic Ama2 space group. K(1) is bonded in a 5-coordinate geometry to one Se(1), two equivalent Se(2), and two equivalent Se(3) atoms. Ta(1) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form TaSe4 tetrahedra that share edges with two equivalent Ag(1)Se4 tetrahedra and edges with two equivalent Ag(2)Se4 tetrahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form distorted AgSe4 tetrahedra that share corners with two equivalent Ag(1)Se4 tetrahedra, corners with four equivalent Ag(2)Se4 tetrahedra, and edges with two equivalent Ta(1)Se4 tetrahedra. In the second Ag site, Ag(2) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form distorted AgSe4 tetrahedra that share corners with four equivalent Ag(1)Se4 tetrahedra and edges with two equivalent Ta(1)Se4 tetrahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 5-coordinate geometry to one K(1), one Ta(1), one Ag(2), and two equivalent Ag(1) atoms. In the second Se site, Se(2) is bonded in a 4-coordinate geometry to one K(1), one Ta(1), one Ag(1), and one Ag(2) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1), one Ta(1), and one Ag(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KTa(AgSe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.421
_cell_length_b   10.421
_cell_length_c   8.376
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   145.592
_symmetry_Int_Tables_number   1
_cell_volume   513.969
_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  0.454  0.822  0.750  1.0
  K  K1  1  0.822  0.454  0.250  1.0
  Ta  Ta2  1  0.523  0.297  0.750  1.0
  Ta  Ta3  1  0.297  0.523  0.250  1.0
  Ag  Ag4  1  0.374  0.374  0.000  1.0
  Ag  Ag5  1  0.374  0.374  0.500  1.0
  Ag  Ag6  1  0.025  0.796  0.750  1.0
  Ag  Ag7  1  0.796  0.025  0.250  1.0
  Se  Se8  1  0.651  0.631  0.750  1.0
  Se  Se9  1  0.631  0.651  0.250  1.0
  Se  Se10  1  0.307  0.068  0.994  1.0
  Se  Se11  1  0.068  0.307  0.494  1.0
  Se  Se12  1  0.411  0.839  0.250  1.0
  Se  Se13  1  0.068  0.307  0.006  1.0
  Se  Se14  1  0.307  0.068  0.506  1.0
  Se  Se15  1  0.839  0.411  0.750  1.0
[/CIF]
.