data_SrSi2W
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.12
_cell_length_b   6.12
_cell_length_c   6.12
_cell_angle_alpha   152.8
_cell_angle_beta   132.7
_cell_angle_gamma   55.42
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrSi2W
_chemical_formula_sum   'Sr1 Si2 W1'
_cell_volume   76.51
_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
  Sr  Sr2  1  0.0  0.0  0.56  1.0
  Si  Si0  1  0.0  0.0  0.64  1.0
  Si  Si1  1  0.44  0.0  0.36  1.0
  W  W3  1  0.0  0.45  0.11  1.0

data_SrSi2W
_symmetry_space_group_name_H-M   P1
_cell_length_a   2.88
_cell_length_b   4.91
_cell_length_c   6.12
_cell_angle_alpha   113.65
_cell_angle_beta   103.6
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrSi2W
_chemical_formula_sum   'Sr1 Si2 W1'
_cell_volume   76.51
_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
  Sr  Sr0  1  0.44  0.44  0.44  1.0
  Si  Si1  1  0.07  0.64  0.07  1.0
  Si  Si2  1  0.36  0.36  0.36  1.0
  W  W3  1  0.89  0.35  0.35  1.0

Sr Si Si W
SrWSi2 crystallizes in the triclinic P1 space group. Sr(1) is bonded in a single-bond geometry to one W(1), one Si(1), and two equivalent Si(2) atoms. The Sr(1)-W(1) bond length is 1.54 Å. The Sr(1)-Si(1) bond length is 0.48 Å. There is one shorter (2.77 Å) and one longer (3.59 Å) Sr(1)-Si(2) bond length. W(1) is bonded in a 3-coordinate geometry to one Sr(1), two equivalent Si(1), and two equivalent Si(2) atoms. There is one shorter (1.33 Å) and one longer (1.55 Å) W(1)-Si(1) bond length. There is one shorter (2.72 Å) and one longer (3.32 Å) W(1)-Si(2) bond length. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a single-bond geometry to one Sr(1), two equivalent W(1), and one Si(2) atom. The Si(1)-Si(2) bond length is 2.61 Å. In the second Si site, Si(2) is bonded in a 7-coordinate geometry to two equivalent Sr(1), two equivalent W(1), one Si(1), and two equivalent Si(2) atoms. Both Si(2)-Si(2) bond lengths are 2.88 Å.