The crystal structure described by Li2Si crystallizes in the trigonal R-3m space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a distorted trigonal non-coplanar geometry to six equivalent Si(1) atoms. In the second Li site, Li(2) is bonded to four equivalent Si(1) atoms to form a mixture of distorted edge and corner-sharing LiSi4 tetrahedra. Si(1) is bonded in a 11-coordinate geometry to four equivalent Li(2), six equivalent Li(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Li2Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.625
_cell_length_b   6.625
_cell_length_c   6.625
_cell_angle_alpha   38.258
_cell_angle_beta   38.258
_cell_angle_gamma   38.258
_symmetry_Int_Tables_number   1
_cell_volume   100.122
_cell_formula_units_Z   2
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  Li0  1  0.641  0.641  0.641  1.0
  Li  Li1  1  0.359  0.359  0.359  1.0
  Li  Li2  1  0.205  0.205  0.205  1.0
  Li  Li3  1  0.795  0.795  0.795  1.0
  Si  Si4  1  0.939  0.939  0.939  1.0
  Si  Si5  1  0.061  0.061  0.061  1.0
[/CIF]
.
The crystal structure described by Li2Si crystallizes in the trigonal R-3m space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a distorted trigonal non-coplanar geometry to six equivalent Si(1) atoms. In the second Li site, Li(2) is bonded to four equivalent Si(1) atoms to form a mixture of distorted edge and corner-sharing LiSi4 tetrahedra. Si(1) is bonded in a 11-coordinate geometry to four equivalent Li(2), six equivalent Li(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Li2Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.625
_cell_length_b   6.625
_cell_length_c   6.625
_cell_angle_alpha   38.258
_cell_angle_beta   38.258
_cell_angle_gamma   38.258
_symmetry_Int_Tables_number   1
_cell_volume   100.122
_cell_formula_units_Z   2
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  Li0  1  0.641  0.641  0.641  1.0
  Li  Li1  1  0.359  0.359  0.359  1.0
  Li  Li2  1  0.205  0.205  0.205  1.0
  Li  Li3  1  0.795  0.795  0.795  1.0
  Si  Si4  1  0.939  0.939  0.939  1.0
  Si  Si5  1  0.061  0.061  0.061  1.0
[/CIF]
.