data_K2ZnAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.68
_cell_length_b   3.68
_cell_length_c   9.47
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2ZnAs
_chemical_formula_sum   'K2 Zn1 As1'
_cell_volume   128.05
_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  K1  1  0.84  0.84  0.85  1.0
  K  K2  1  0.84  0.84  0.62  1.0
  Zn  Zn3  1  0.0  0.0  0.0  1.0
  As  As0  1  0.0  0.0  0.74  1.0

data_K2ZnAs
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.2
_cell_length_b   5.2
_cell_length_c   9.47
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2ZnAs
_chemical_formula_sum   'K4 Zn2 As2'
_cell_volume   256.11
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  2  0.34  0.5  0.62  1.0
  K  K1  2  0.34  0.5  0.85  1.0
  Zn  Zn2  2  0.0  0.0  0.0  1.0
  As  As3  2  0.0  0.0  0.74  1.0

K K Zn As
K2ZnAs crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two K2ZnAs clusters. There are two inequivalent K sites. In the first K site, K(1) is bonded in a distorted water-like geometry to one Zn(1) and one As(1) atom. The K(1)-Zn(1) bond length is 1.64 Å. The K(1)-As(1) bond length is 1.38 Å. In the second K site, K(2) is bonded in a single-bond geometry to one As(1) atom. The K(2)-As(1) bond length is 1.38 Å. Zn(1) is bonded in a single-bond geometry to one K(1) atom. As(1) is bonded in a water-like geometry to one K(1) and one K(2) atom.