The structure described by W2AlSi3 crystallizes in the tetragonal P4mm space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 10-coordinate geometry to four equivalent Al(1), one Si(1), one Si(2), and four equivalent Si(3) atoms. In the second W site, W(2) is bonded in a distorted q6 geometry to one Al(1), one Si(3), four equivalent Si(1), and four equivalent Si(2) atoms. Al(1) is bonded in a distorted q6 geometry to one W(2), four equivalent W(1), one Si(3), and four equivalent Si(2) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to one W(1), four equivalent W(2), one Si(2), and four equivalent Si(3) atoms. In the second Si site, Si(2) is bonded in a 10-coordinate geometry to one W(1), four equivalent W(2), four equivalent Al(1), and one Si(1) atom. In the third Si site, Si(3) is bonded in a 10-coordinate geometry to one W(2), four equivalent W(1), one Al(1), and four equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_AlSi3W2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.214
_cell_length_b   3.214
_cell_length_c   8.033
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   82.964
_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
  Al  Al0  1  0.500  0.500  0.168  1.0
  Si  Si1  1  0.000  0.000  0.667  1.0
  Si  Si2  1  0.000  0.000  0.337  1.0
  Si  Si3  1  0.500  0.500  0.836  1.0
  W  W4  1  0.000  0.000  0.988  1.0
  W  W5  1  0.500  0.500  0.505  1.0
[/CIF]
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The structure described by W2AlSi3 crystallizes in the tetragonal P4mm space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 10-coordinate geometry to four equivalent Al(1), one Si(1), one Si(2), and four equivalent Si(3) atoms. In the second W site, W(2) is bonded in a distorted q6 geometry to one Al(1), one Si(3), four equivalent Si(1), and four equivalent Si(2) atoms. Al(1) is bonded in a distorted q6 geometry to one W(2), four equivalent W(1), one Si(3), and four equivalent Si(2) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to one W(1), four equivalent W(2), one Si(2), and four equivalent Si(3) atoms. In the second Si site, Si(2) is bonded in a 10-coordinate geometry to one W(1), four equivalent W(2), four equivalent Al(1), and one Si(1) atom. In the third Si site, Si(3) is bonded in a 10-coordinate geometry to one W(2), four equivalent W(1), one Al(1), and four equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_AlSi3W2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.214
_cell_length_b   3.214
_cell_length_c   8.033
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   82.964
_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
  Al  Al0  1  0.500  0.500  0.168  1.0
  Si  Si1  1  0.000  0.000  0.667  1.0
  Si  Si2  1  0.000  0.000  0.337  1.0
  Si  Si3  1  0.500  0.500  0.836  1.0
  W  W4  1  0.000  0.000  0.988  1.0
  W  W5  1  0.500  0.500  0.505  1.0
[/CIF]
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