data_Sr2AlW
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.2
_cell_length_b   11.2
_cell_length_c   11.2
_cell_angle_alpha   16.98
_cell_angle_beta   16.98
_cell_angle_gamma   16.98
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr2AlW
_chemical_formula_sum   'Sr2 Al1 W1'
_cell_volume   104.4
_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  Sr1  1  0.0  0.0  0.18  1.0
  Sr  Sr2  1  0.0  0.0  0.92  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0
  W  W3  1  0.0  0.0  0.55  1.0

data_Sr2AlW
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.73
_cell_length_b   3.31
_cell_length_c   11.2
_cell_angle_alpha   90.0
_cell_angle_beta   99.81
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Sr2AlW
_chemical_formula_sum   'Sr4 Al2 W2'
_cell_volume   208.79
_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
  Sr  Sr0  2  0.0  0.0  0.08  1.0
  Sr  Sr1  2  0.0  0.0  0.82  1.0
  Al  Al2  2  0.0  0.0  0.0  1.0
  W  W3  2  0.0  0.0  0.45  1.0

Sr Sr Al W
Sr2WAl crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a single-bond geometry to one W(1) and one Al(1) atom. The Sr(1)-W(1) bond length is 4.18 Å. The Sr(1)-Al(1) bond length is 1.96 Å. In the second Sr site, Sr(2) is bonded in a single-bond geometry to one W(1) and one Al(1) atom. The Sr(2)-W(1) bond length is 4.18 Å. The Sr(2)-Al(1) bond length is 0.87 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one Sr(1); one Sr(2); and six W(1,1) atoms to form a mixture of corner and edge-sharing WSr2W6 hexagonal bipyramids. All W(1)-W(1,1) bond lengths are 3.31 Å. In the second W site, W(1) is bonded to one Sr(1); one Sr(2); and six W(1,1) atoms to form a mixture of corner and edge-sharing WSr2W6 hexagonal bipyramids. The W(1)-Sr(1) bond length is 4.18 Å. The W(1)-Sr(2) bond length is 4.18 Å. Both W(1)-W(1) bond lengths are 3.31 Å. Al(1) is bonded in a distorted linear geometry to one Sr(1) and one Sr(2) atom.