data_KNbGe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.76
_cell_length_b   4.76
_cell_length_c   7.08
_cell_angle_alpha   97.36
_cell_angle_beta   97.36
_cell_angle_gamma   38.16
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KNbGe2
_chemical_formula_sum   'K1 Nb1 Ge2'
_cell_volume   98.3
_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  0.0  1.0
  Nb  Nb3  1  0.02  0.0  0.51  1.0
  Ge  Ge0  1  0.56  0.0  0.41  1.0
  Ge  Ge1  1  0.48  0.0  0.6  1.0

data_KNbGe2
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.11
_cell_length_b   4.76
_cell_length_c   7.08
_cell_angle_alpha   97.36
_cell_angle_beta   90.0
_cell_angle_gamma   109.08
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KNbGe2
_chemical_formula_sum   'K1 Nb1 Ge2'
_cell_volume   98.3
_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  0.0  0.0  0.0  1.0
  Nb  Nb1  1  0.0  0.98  0.49  1.0
  Ge  Ge2  1  0.0  0.44  0.59  1.0
  Ge  Ge3  1  0.0  0.52  0.4  1.0

K Nb Ge Ge
KNbGe2 crystallizes in the triclinic P1 space group. K(1) is bonded to two equivalent K(1), two equivalent Nb(1), two equivalent Ge(1), and two equivalent Ge(2) atoms to form a mixture of distorted corner and edge-sharing KK2Nb2Ge4 hexagonal bipyramids. Both K(1)-K(1) bond lengths are 3.11 Å. There is one shorter (3.49 Å) and one longer (3.59 Å) K(1)-Nb(1) bond length. There is one shorter (3.70 Å) and one longer (3.83 Å) K(1)-Ge(1) bond length. There is one shorter (3.50 Å) and one longer (3.85 Å) K(1)-Ge(2) bond length. Nb(1) is bonded in a distorted linear geometry to two equivalent K(1), one Ge(1), and one Ge(2) atom. The Nb(1)-Ge(1) bond length is 2.22 Å. The Nb(1)-Ge(2) bond length is 2.22 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a distorted L-shaped geometry to two equivalent K(1), one Nb(1), and one Ge(2) atom. The Ge(1)-Ge(2) bond length is 1.42 Å. In the second Ge site, Ge(2) is bonded in a distorted L-shaped geometry to two equivalent K(1), one Nb(1), and one Ge(1) atom.