data_SrAlW2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.43
_cell_length_b   10.43
_cell_length_c   10.43
_cell_angle_alpha   16.04
_cell_angle_beta   16.04
_cell_angle_gamma   16.04
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrAlW2
_chemical_formula_sum   'Sr1 Al1 W2'
_cell_volume   75.63
_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  0.45  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0
  W  W2  1  0.0  0.0  0.07  1.0
  W  W3  1  0.0  0.0  0.83  1.0

data_SrAlW2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.04
_cell_length_b   2.91
_cell_length_c   10.43
_cell_angle_alpha   90.0
_cell_angle_beta   99.27
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrAlW2
_chemical_formula_sum   'Sr2 Al2 W4'
_cell_volume   151.25
_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  0.55  1.0
  Al  Al1  2  0.0  0.0  0.0  1.0
  W  W2  2  0.0  0.0  0.17  1.0
  W  W3  2  0.0  0.0  0.93  1.0

Sr Al W W
Sr Al W W 0 0 o + - 0 0 + - o 0 0 + o - 1 2 o o o 1 3 o o - 
SrW2Al crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to six Sr(1,1); one W(1); and one W(2) atom to form a mixture of edge and corner-sharing SrSr6W2 hexagonal bipyramids. All Sr(1)-Sr(1,1) bond lengths are 2.91 Å. The Sr(1)-W(1) bond length is 3.96 Å. The Sr(1)-W(2) bond length is 3.96 Å. In the second Sr site, Sr(1) is bonded to six Sr(1,1); one W(1); and one W(2) atom to form a mixture of edge and corner-sharing SrSr6W2 hexagonal bipyramids. Both Sr(1)-Sr(1) bond lengths are 2.91 Å. The Sr(1)-W(1) bond length is 3.96 Å. The Sr(1)-W(2) bond length is 3.96 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded in a single-bond geometry to one Sr(1) and one Al(1) atom. The W(1)-Al(1) bond length is 0.69 Å. In the second W site, W(2) is bonded in a single-bond geometry to one Sr(1) and one Al(1) atom. The W(2)-Al(1) bond length is 1.82 Å. Al(1) is bonded in a distorted single-bond geometry to one W(1) and one W(2) atom.