data_FeW3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.3
_cell_length_b   9.3
_cell_length_c   9.3
_cell_angle_alpha   17.09
_cell_angle_beta   17.09
_cell_angle_gamma   17.09
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeW3
_chemical_formula_sum   'Fe1 W3'
_cell_volume   60.53
_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
  Fe  Fe0  1  0.0  0.0  0.0  1.0
  W  W1  1  0.0  0.0  0.41  1.0
  W  W2  1  0.0  0.0  0.74  1.0
  W  W3  1  0.0  0.0  0.07  1.0

data_FeW3
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.78
_cell_length_b   2.76
_cell_length_c   9.3
_cell_angle_alpha   90.0
_cell_angle_beta   99.88
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   FeW3
_chemical_formula_sum   'Fe2 W6'
_cell_volume   121.06
_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
  Fe  Fe0  2  0.0  0.0  0.0  1.0
  W  W1  2  0.0  0.0  0.26  1.0
  W  W2  2  0.0  0.0  0.59  1.0
  W  W3  2  0.0  0.0  0.93  1.0

Fe W W W
W3Fe crystallizes in the monoclinic Cm space group. There are four inequivalent W sites. In the first W site, W(1) is bonded to one W(2); one W(3); and six W(1,1) atoms to form a mixture of corner and edge-sharing WW8 hexagonal bipyramids. The W(1)-W(2) bond length is 3.07 Å. The W(1)-W(3) bond length is 3.16 Å. All W(1)-W(1,1) bond lengths are 2.76 Å. In the second W site, W(2) is bonded in a single-bond geometry to one W(1) and one Fe(1) atom. The W(2)-Fe(1) bond length is 2.44 Å. In the third W site, W(3) is bonded in a single-bond geometry to one W(1) and one Fe(1) atom. The W(3)-Fe(1) bond length is 0.63 Å. In the fourth W site, W(1) is bonded to one W(2); one W(3); and six W(1,1) atoms to form a mixture of corner and edge-sharing WW8 hexagonal bipyramids. The W(1)-W(2) bond length is 3.07 Å. The W(1)-W(3) bond length is 3.16 Å. Both W(1)-W(1) bond lengths are 2.76 Å. Fe(1) is bonded in a single-bond geometry to one W(2) and one W(3) atom.