data_Si2BiW
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.23
_cell_length_b   3.23
_cell_length_c   7.68
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2BiW
_chemical_formula_sum   'Si2 Bi1 W1'
_cell_volume   79.95
_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  Si1  1  0.0  0.0  0.76  1.0
  Si  Si2  1  0.61  0.61  0.07  1.0
  Bi  Bi0  1  0.61  0.61  0.42  1.0
  W  W3  1  0.0  0.0  0.28  1.0

data_Si2BiW
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.56
_cell_length_b   4.56
_cell_length_c   7.68
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Si2BiW
_chemical_formula_sum   'Si4 Bi2 W2'
_cell_volume   159.89
_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  0.76  1.0
  Si  Si1  2  0.11  0.5  0.07  1.0
  Bi  Bi2  2  0.11  0.5  0.42  1.0
  W  W3  2  0.0  0.0  0.28  1.0

Si Si Bi W
Si Si Bi W 0 2 - - o 0 2 - o o 0 2 o - o 0 2 o o o 0 1 - - + 0 1 - o + 0 1 o - + 0 1 o o + 0 0 + o o 0 0 o + o 0 3 o o o 1 3 o o o 1 3 o + o 1 3 + o o 1 3 + + o 1 1 + o o 1 1 o + o 1 2 o o o 2 3 o + o 2 3 + o o 2 3 + + o 
WSi2Bi crystallizes in the monoclinic Cm space group. W(1) is bonded in a 8-coordinate geometry to four equivalent Si(2) and four equivalent Bi(1) atoms. There are a spread of W(1)-Si(2) bond distances ranging from 2.38-3.22 Å. There are a spread of W(1)-Bi(1) bond distances ranging from 2.09-3.01 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted water-like geometry to one Si(2) and one Bi(1) atom. The Si(1)-Si(2) bond length is 2.95 Å. The Si(1)-Bi(1) bond length is 3.15 Å. In the second Si site, Si(2) is bonded in a 1-coordinate geometry to four equivalent W(1) and one Si(1) atom. Bi(1) is bonded in a 1-coordinate geometry to four equivalent W(1) and one Si(1) atom.