data_FeW3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.94
_cell_length_b   4.94
_cell_length_c   4.94
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeW3
_chemical_formula_sum   'Fe2 W6'
_cell_volume   120.82
_cell_formula_units_Z   2
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  0.47  0.47  0.47  1.0
  Fe  Fe1  1  0.0  0.0  0.0  1.0
  W  W2  1  0.47  0.71  0.0  1.0
  W  W3  1  0.47  0.24  0.0  1.0
  W  W4  1  0.71  0.0  0.47  1.0
  W  W5  1  0.0  0.47  0.71  1.0
  W  W6  1  0.0  0.47  0.24  1.0
  W  W7  1  0.24  0.0  0.47  1.0

data_FeW3
_symmetry_space_group_name_H-M   R3
_cell_length_a   6.99
_cell_length_b   6.99
_cell_length_c   8.56
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   146
_chemical_formula_structural   FeW3
_chemical_formula_sum   'Fe6 W18'
_cell_volume   362.47
_cell_formula_units_Z   6
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  'x+1/3, y+2/3, z+2/3'
  5  '-y+1/3, x-y+2/3, z+2/3'
  6  '-x+y+1/3, -x+2/3, z+2/3'
  7  'x+2/3, y+1/3, z+1/3'
  8  '-y+2/3, x-y+1/3, z+1/3'
  9  '-x+y+2/3, -x+1/3, z+1/3'
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  3  0.0  0.0  0.0  1.0
  Fe  Fe1  3  0.0  0.0  0.47  1.0
  W  W2  9  0.08  0.39  0.39  1.0
  W  W3  9  0.1  0.67  0.9  1.0

Fe Fe W W W W W W
W3Fe is beta Uranium-derived structured and crystallizes in the trigonal R3 space group. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 6-coordinate geometry to two equivalent W(2), two equivalent Fe(1), and two equivalent Fe(2) atoms. There is one shorter (2.33 Å) and one longer (2.61 Å) W(1)-W(2) bond length. There is one shorter (2.61 Å) and one longer (2.86 Å) W(1)-Fe(1) bond length. There is one shorter (2.74 Å) and one longer (2.98 Å) W(1)-Fe(2) bond length. In the second W site, W(2) is bonded in a 6-coordinate geometry to two equivalent W(1), two equivalent Fe(1), and two equivalent Fe(2) atoms. There is one shorter (2.61 Å) and one longer (2.86 Å) W(2)-Fe(1) bond length. There is one shorter (2.61 Å) and one longer (2.86 Å) W(2)-Fe(2) bond length. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to six equivalent W(1) and six equivalent W(2) atoms to form a mixture of face and edge-sharing FeW12 cuboctahedra. In the second Fe site, Fe(2) is bonded to six equivalent W(1) and six equivalent W(2) atoms to form a mixture of face and edge-sharing FeW12 cuboctahedra.