data_Li2SiBr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.83
_cell_length_b   4.83
_cell_length_c   3.21
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Li2SiBr
_chemical_formula_sum   'Li2 Si1 Br1'
_cell_volume   74.86
_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  0.42  0.0  0.6  1.0
  Li  Li2  1  0.0  0.42  0.6  1.0
  Si  Si3  1  0.0  0.0  0.0  1.0
  Br  Br0  1  0.42  0.42  0.0  1.0

data_Li2SiBr
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.83
_cell_length_b   6.83
_cell_length_c   3.21
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Li2SiBr
_chemical_formula_sum   'Li4 Si2 Br2'
_cell_volume   149.71
_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  4  0.21  0.21  0.6  1.0
  Si  Si1  2  0.0  0.0  0.0  1.0
  Br  Br2  2  0.42  0.0  -0.0  1.0

Li Li Si Br
Li2SiBr crystallizes in the monoclinic Cm space group. Li(1) is bonded in a 5-coordinate geometry to three equivalent Si(1) and three equivalent Br(1) atoms. There are a spread of Li(1)-Si(1) bond distances ranging from 2.37-3.10 Å. There are a spread of Li(1)-Br(1) bond distances ranging from 2.37-3.10 Å. Si(1) is bonded in a 7-coordinate geometry to six equivalent Li(1) and one Br(1) atom. The Si(1)-Br(1) bond length is 2.84 Å. Br(1) is bonded in a 7-coordinate geometry to six equivalent Li(1) and one Si(1) atom.