The material structure described by K5CuAs2 crystallizes in the hexagonal P6_3/mmc space group. There are three inequivalent K sites. In the first K site, K(1) is bonded to four equivalent As(1) atoms to form distorted KAs4 tetrahedra that share corners with six equivalent K(1)As4 tetrahedra, corners with four equivalent Cu(1)K3As2 trigonal bipyramids, and edges with three equivalent K(1)As4 tetrahedra. In the second K site, K(2) is bonded in a distorted trigonal planar geometry to three equivalent As(1) atoms. In the third K site, K(3) is bonded in a trigonal planar geometry to three equivalent Cu(1) atoms. Cu(1) is bonded to three equivalent K(3) and two equivalent As(1) atoms to form distorted CuK3As2 trigonal bipyramids that share corners with eight equivalent K(1)As4 tetrahedra and corners with six equivalent Cu(1)K3As2 trigonal bipyramids. As(1) is bonded in a 8-coordinate geometry to three equivalent K(2), four equivalent K(1), and one Cu(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K5CuAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.740
_cell_length_b   5.740
_cell_length_c   18.711
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   533.848
_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  0.333  0.667  0.550  1.0
  K  K1  1  0.667  0.333  0.050  1.0
  K  K2  1  0.667  0.333  0.450  1.0
  K  K3  1  0.333  0.667  0.950  1.0
  K  K4  1  0.000  0.000  0.146  1.0
  K  K5  1  0.000  0.000  0.646  1.0
  K  K6  1  0.000  0.000  0.854  1.0
  K  K7  1  0.000  0.000  0.354  1.0
  K  K8  1  0.333  0.667  0.750  1.0
  K  K9  1  0.667  0.333  0.250  1.0
  Cu  Cu10  1  0.333  0.667  0.250  1.0
  Cu  Cu11  1  0.667  0.333  0.750  1.0
  As  As12  1  0.333  0.667  0.373  1.0
  As  As13  1  0.667  0.333  0.873  1.0
  As  As14  1  0.667  0.333  0.627  1.0
  As  As15  1  0.333  0.667  0.127  1.0
[/CIF]
.
The material structure described by K5CuAs2 crystallizes in the hexagonal P6_3/mmc space group. There are three inequivalent K sites. In the first K site, K(1) is bonded to four equivalent As(1) atoms to form distorted KAs4 tetrahedra that share corners with six equivalent K(1)As4 tetrahedra, corners with four equivalent Cu(1)K3As2 trigonal bipyramids, and edges with three equivalent K(1)As4 tetrahedra. In the second K site, K(2) is bonded in a distorted trigonal planar geometry to three equivalent As(1) atoms. In the third K site, K(3) is bonded in a trigonal planar geometry to three equivalent Cu(1) atoms. Cu(1) is bonded to three equivalent K(3) and two equivalent As(1) atoms to form distorted CuK3As2 trigonal bipyramids that share corners with eight equivalent K(1)As4 tetrahedra and corners with six equivalent Cu(1)K3As2 trigonal bipyramids. As(1) is bonded in a 8-coordinate geometry to three equivalent K(2), four equivalent K(1), and one Cu(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K5CuAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.740
_cell_length_b   5.740
_cell_length_c   18.711
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   533.848
_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  0.333  0.667  0.550  1.0
  K  K1  1  0.667  0.333  0.050  1.0
  K  K2  1  0.667  0.333  0.450  1.0
  K  K3  1  0.333  0.667  0.950  1.0
  K  K4  1  0.000  0.000  0.146  1.0
  K  K5  1  0.000  0.000  0.646  1.0
  K  K6  1  0.000  0.000  0.854  1.0
  K  K7  1  0.000  0.000  0.354  1.0
  K  K8  1  0.333  0.667  0.750  1.0
  K  K9  1  0.667  0.333  0.250  1.0
  Cu  Cu10  1  0.333  0.667  0.250  1.0
  Cu  Cu11  1  0.667  0.333  0.750  1.0
  As  As12  1  0.333  0.667  0.373  1.0
  As  As13  1  0.667  0.333  0.873  1.0
  As  As14  1  0.667  0.333  0.627  1.0
  As  As15  1  0.333  0.667  0.127  1.0
[/CIF]
.