data_SiGe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.45
_cell_length_b   9.45
_cell_length_c   9.45
_cell_angle_alpha   18.31
_cell_angle_beta   18.31
_cell_angle_gamma   18.31
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiGe3
_chemical_formula_sum   'Si1 Ge3'
_cell_volume   72.64
_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
  Si  Si3  1  0.0  0.0  0.0  1.0
  Ge  Ge0  1  0.0  0.0  0.77  1.0
  Ge  Ge1  1  0.0  0.0  0.93  1.0
  Ge  Ge2  1  0.0  0.0  0.09  1.0

data_SiGe3
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.21
_cell_length_b   3.01
_cell_length_c   9.45
_cell_angle_alpha   90.0
_cell_angle_beta   100.58
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SiGe3
_chemical_formula_sum   'Si2 Ge6'
_cell_volume   145.28
_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
  Si  Si0  2  0.0  0.0  0.0  1.0
  Ge  Ge1  2  0.0  0.0  0.07  1.0
  Ge  Ge2  2  0.0  0.0  0.23  1.0
  Ge  Ge3  2  0.0  0.0  0.91  1.0

Si Ge Ge Ge
Ge3Si is Cyanogen Chloride-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Ge3Si clusters. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a single-bond geometry to one Ge(2) atom. The Ge(1)-Ge(2) bond length is 1.54 Å. In the second Ge site, Ge(2) is bonded in a distorted single-bond geometry to one Ge(1) and one Si(1) atom. The Ge(2)-Si(1) bond length is 0.67 Å. In the third Ge site, Ge(3) is bonded in a single-bond geometry to one Si(1) atom. The Ge(3)-Si(1) bond length is 0.87 Å. Si(1) is bonded in a linear geometry to one Ge(2) and one Ge(3) atom.