data_K2GeAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.29
_cell_length_b   11.29
_cell_length_c   11.29
_cell_angle_alpha   17.44
_cell_angle_beta   17.44
_cell_angle_gamma   17.44
_symmetry_Int_Tables_number   1
_chemical_formula_structural   K2GeAs
_chemical_formula_sum   'K2 Ge1 As1'
_cell_volume   112.64
_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  K2  1  0.0  0.0  0.21  1.0
  K  K3  1  0.0  0.0  0.12  1.0
  Ge  Ge1  1  0.0  0.0  0.0  1.0
  As  As0  1  0.0  0.0  0.67  1.0

data_K2GeAs
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.93
_cell_length_b   3.42
_cell_length_c   11.29
_cell_angle_alpha   90.0
_cell_angle_beta   100.08
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   K2GeAs
_chemical_formula_sum   'K4 Ge2 As2'
_cell_volume   225.28
_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  0.0  0.0  0.79  1.0
  K  K1  2  0.0  0.0  0.88  1.0
  Ge  Ge2  2  0.0  0.0  0.0  1.0
  As  As3  2  0.0  0.0  0.33  1.0

K K Ge As
K2GeAs crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two 7440-38-2 atoms and two K2Ge clusters. In each K2Ge cluster, there are two inequivalent K sites. In the first K site, K(1) is bonded in a single-bond geometry to one K(2) atom. The K(1)-K(2) bond length is 0.96 Å. In the second K site, K(2) is bonded in a distorted linear geometry to one K(1) and one Ge(1) atom. The K(2)-Ge(1) bond length is 1.41 Å. Ge(1) is bonded in a single-bond geometry to one K(2) atom.