The compound described by K4CdAs2 crystallizes in the trigonal R-3m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent As(1) atoms to form a mixture of corner and edge-sharing KAs4 tetrahedra. In the second K site, K(2) is bonded in a 6-coordinate geometry to three equivalent Cd(1) and three equivalent As(1) atoms. Cd(1) is bonded in a distorted linear geometry to six equivalent K(2) and two equivalent As(1) atoms. As(1) is bonded in a body-centered cubic geometry to three equivalent K(2), four equivalent K(1), and one Cd(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4CdAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.847
_cell_length_b   9.847
_cell_length_c   9.847
_cell_angle_alpha   34.243
_cell_angle_beta   34.243
_cell_angle_gamma   34.243
_symmetry_Int_Tables_number   1
_cell_volume   269.601
_cell_formula_units_Z   1
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  0.208  0.208  0.208  1.0
  K  K1  1  0.792  0.792  0.792  1.0
  K  K2  1  0.392  0.392  0.392  1.0
  K  K3  1  0.608  0.608  0.608  1.0
  Cd  Cd4  1  0.000  0.000  0.000  1.0
  As  As5  1  0.911  0.911  0.911  1.0
  As  As6  1  0.089  0.089  0.089  1.0
[/CIF]
.
The compound described by K4CdAs2 crystallizes in the trigonal R-3m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to four equivalent As(1) atoms to form a mixture of corner and edge-sharing KAs4 tetrahedra. In the second K site, K(2) is bonded in a 6-coordinate geometry to three equivalent Cd(1) and three equivalent As(1) atoms. Cd(1) is bonded in a distorted linear geometry to six equivalent K(2) and two equivalent As(1) atoms. As(1) is bonded in a body-centered cubic geometry to three equivalent K(2), four equivalent K(1), and one Cd(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4CdAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.847
_cell_length_b   9.847
_cell_length_c   9.847
_cell_angle_alpha   34.243
_cell_angle_beta   34.243
_cell_angle_gamma   34.243
_symmetry_Int_Tables_number   1
_cell_volume   269.601
_cell_formula_units_Z   1
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  0.208  0.208  0.208  1.0
  K  K1  1  0.792  0.792  0.792  1.0
  K  K2  1  0.392  0.392  0.392  1.0
  K  K3  1  0.608  0.608  0.608  1.0
  Cd  Cd4  1  0.000  0.000  0.000  1.0
  As  As5  1  0.911  0.911  0.911  1.0
  As  As6  1  0.089  0.089  0.089  1.0
[/CIF]
.