data_Li2SiGe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.41
_cell_length_b   3.41
_cell_length_c   5.39
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Li2SiGe
_chemical_formula_sum   'Li2 Si1 Ge1'
_cell_volume   62.68
_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
  Li  Li1  1  0.0  0.0  0.35  1.0
  Li  Li2  1  0.7  0.7  0.42  1.0
  Si  Si3  1  0.0  0.0  0.77  1.0
  Ge  Ge0  1  0.7  0.7  0.94  1.0

data_Li2SiGe
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.82
_cell_length_b   4.82
_cell_length_c   5.39
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Li2SiGe
_chemical_formula_sum   'Li4 Si2 Ge2'
_cell_volume   125.35
_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
  Li  Li0  2  0.0  0.0  0.35  1.0
  Li  Li1  2  0.2  0.5  0.42  1.0
  Si  Si2  2  0.0  0.0  0.77  1.0
  Ge  Ge3  2  0.2  0.5  0.94  1.0

Li Li Si Ge
Li2GeSi crystallizes in the monoclinic Cm space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 3-coordinate geometry to one Li(2), one Ge(1), and one Si(1) atom. The Li(1)-Li(2) bond length is 1.48 Å. The Li(1)-Ge(1) bond length is 2.59 Å. The Li(1)-Si(1) bond length is 2.29 Å. In the second Li site, Li(2) is bonded in a 3-coordinate geometry to one Li(1), two equivalent Ge(1), and one Si(1) atom. There is one shorter (2.58 Å) and one longer (2.81 Å) Li(2)-Ge(1) bond length. The Li(2)-Si(1) bond length is 2.36 Å. Ge(1) is bonded in a 6-coordinate geometry to one Li(1), two equivalent Li(2), and three equivalent Si(1) atoms. There is one shorter (1.70 Å) and two longer (2.77 Å) Ge(1)-Si(1) bond lengths. Si(1) is bonded in a 3-coordinate geometry to one Li(1), one Li(2), and three equivalent Ge(1) atoms.