data_FeW2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.76
_cell_length_b   2.76
_cell_length_c   6.68
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeW2
_chemical_formula_sum   'Fe1 W2'
_cell_volume   44.22
_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  0.38  0.8  0.11  1.0
  W  W2  1  0.0  0.6  0.58  1.0

data_FeW2
_symmetry_space_group_name_H-M   P1
_cell_length_a   2.76
_cell_length_b   2.76
_cell_length_c   6.68
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeW2
_chemical_formula_sum   'Fe1 W2'
_cell_volume   44.22
_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  0.6  0.58  1.0
  W  W2  1  0.38  0.8  0.11  1.0

Fe W W
Fe W W 0 1 - - o 0 1 o - o 0 2 o - - 0 2 o o - 1 2 o o o 2 2 + + o 2 2 o + o 2 2 + o o 
W2Fe crystallizes in the triclinic P1 space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 3-coordinate geometry to one W(2) and three equivalent Fe(1) atoms. The W(1)-W(2) bond length is 3.28 Å. There are a spread of W(1)-Fe(1) bond distances ranging from 1.58-2.04 Å. In the second W site, W(2) is bonded in a 9-coordinate geometry to one W(1), six equivalent W(2), and two equivalent Fe(1) atoms. All W(2)-W(2) bond lengths are 2.76 Å. There is one shorter (3.04 Å) and one longer (3.28 Å) W(2)-Fe(1) bond length. Fe(1) is bonded in a 3-coordinate geometry to two equivalent W(2) and three equivalent W(1) atoms.