The structure described by WFeSi is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the orthorhombic Amm2 space group. There are five inequivalent W sites. In the first W site, W(1) is bonded in a 16-coordinate geometry to one W(1), three equivalent W(2), one Fe(1), two equivalent Fe(2), two equivalent Fe(3), three equivalent Si(2), and four equivalent Si(1) atoms. In the second W site, W(2) is bonded in a 16-coordinate geometry to one W(2); three W(1,1); one Fe(3); two equivalent Fe(1); four equivalent Fe(2); two equivalent Si(1); and three equivalent Si(2) atoms. In the third W site, W(2) is bonded in a 16-coordinate geometry to one W(2); three W(1,1); one Fe(3); two equivalent Fe(1); four equivalent Fe(2); two equivalent Si(1); and three equivalent Si(2) atoms. In the fourth W site, W(1) is bonded in a 16-coordinate geometry to one W(1), three equivalent W(2), one Fe(1), two equivalent Fe(2), two equivalent Fe(3), three equivalent Si(2), and four equivalent Si(1) atoms. In the fifth W site, W(1) is bonded in a 16-coordinate geometry to one W(1), three equivalent W(2), one Fe(1), two equivalent Fe(2), two equivalent Fe(3), three equivalent Si(2), and four equivalent Si(1) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent W(1); four W(2,2); four equivalent Fe(2); and two equivalent Si(2) atoms to form FeFe4Si2W6 cuboctahedra that share corners with two equivalent Fe(3)Si6W6 cuboctahedra, corners with four equivalent Fe(1)Fe4Si2W6 cuboctahedra, corners with four equivalent Si(2)Fe4Si2W6 cuboctahedra, corners with eight equivalent Si(1)Fe2Si4W6 cuboctahedra, edges with two equivalent Fe(1)Fe4Si2W6 cuboctahedra, edges with four equivalent Fe(3)Si6W6 cuboctahedra, faces with four equivalent Si(1)Fe2Si4W6 cuboctahedra, faces with six equivalent Si(2)Fe4Si2W6 cuboctahedra, and faces with eight equivalent Fe(2)Fe4Si2W6 cuboctahedra. In the second Fe site, Fe(2) is bonded to two equivalent W(1); four W(2,2); two equivalent Fe(1); two equivalent Fe(2); and two equivalent Si(2) atoms to form distorted FeFe4Si2W6 cuboctahedra that share corners with four equivalent Fe(2)Fe4Si2W6 cuboctahedra, corners with four equivalent Fe(3)Si6W6 cuboctahedra, corners with four equivalent Si(2)Fe4Si2W6 cuboctahedra, corners with six equivalent Si(1)Fe2Si4W6 cuboctahedra, edges with two equivalent Fe(2)Fe4Si2W6 cuboctahedra, edges with four equivalent Si(1)Fe2Si4W6 cuboctahedra, faces with two equivalent Fe(3)Si6W6 cuboctahedra, faces with two equivalent Si(1)Fe2Si4W6 cuboctahedra, faces with four equivalent Fe(1)Fe4Si2W6 cuboctahedra, faces with four equivalent Fe(2)Fe4Si2W6 cuboctahedra, and faces with six equivalent Si(2)Fe4Si2W6 cuboctahedra. In the third Fe site, Fe(3) is bonded to two W(2,2); four W(1,1); two equivalent Si(2); and four equivalent Si(1) atoms to form distorted FeSi6W6 cuboctahedra that share corners with two equivalent Fe(1)Fe4Si2W6 cuboctahedra, corners with four equivalent Fe(3)Si6W6 cuboctahedra, corners with four equivalent Si(2)Fe4Si2W6 cuboctahedra, corners with eight equivalent Fe(2)Fe4Si2W6 cuboctahedra, edges with two equivalent Fe(3)Si6W6 cuboctahedra, edges with four equivalent Fe(1)Fe4Si2W6 cuboctahedra, faces with four equivalent Fe(2)Fe4Si2W6 cuboctahedra, faces with six equivalent Si(2)Fe4Si2W6 cuboctahedra, and faces with eight equivalent Si(1)Fe2Si4W6 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to two W(2,2); four W(1,1,1); two equivalent Fe(3); two equivalent Si(1); and two equivalent Si(2) atoms to form distorted SiFe2Si4W6 cuboctahedra that share corners with four equivalent Fe(1)Fe4Si2W6 cuboctahedra, corners with four equivalent Si(1)Fe2Si4W6 cuboctahedra, corners with four equivalent Si(2)Fe4Si2W6 cuboctahedra, corners with six equivalent Fe(2)Fe4Si2W6 cuboctahedra, edges with two equivalent Si(1)Fe2Si4W6 cuboctahedra, edges with four equivalent Fe(2)Fe4Si2W6 cuboctahedra, faces with two equivalent Fe(1)Fe4Si2W6 cuboctahedra, faces with two equivalent Fe(2)Fe4Si2W6 cuboctahedra, faces with four equivalent Fe(3)Si6W6 cuboctahedra, faces with four equivalent Si(1)Fe2Si4W6 cuboctahedra, and faces with six equivalent Si(2)Fe4Si2W6 cuboctahedra. In the second Si site, Si(2) is bonded to three W(1,1); three equivalent W(2); one Fe(1); one Fe(3); two equivalent Fe(2); and two equivalent Si(1) atoms to form distorted SiFe4Si2W6 cuboctahedra that share corners with two equivalent Fe(1)Fe4Si2W6 cuboctahedra, corners with two equivalent Fe(3)Si6W6 cuboctahedra, corners with four equivalent Fe(2)Fe4Si2W6 cuboctahedra, corners with four equivalent Si(1)Fe2Si4W6 cuboctahedra, edges with six equivalent Si(2)Fe4Si2W6 cuboctahedra, faces with two equivalent Si(2)Fe4Si2W6 cuboctahedra, faces with three equivalent Fe(1)Fe4Si2W6 cuboctahedra, faces with three equivalent Fe(3)Si6W6 cuboctahedra, faces with six equivalent Fe(2)Fe4Si2W6 cuboctahedra, and faces with six equivalent Si(1)Fe2Si4W6 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_FeSiW
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.729
_cell_length_b   4.729
_cell_length_c   7.648
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   117.265
_symmetry_Int_Tables_number   1
_cell_volume   152.008
_cell_formula_units_Z   4
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  0.171  0.829  0.000  1.0
  Fe  Fe1  1  0.652  0.828  0.000  1.0
  Fe  Fe2  1  0.172  0.348  0.000  1.0
  Fe  Fe3  1  0.852  0.148  0.500  1.0
  Si  Si4  1  0.355  0.164  0.500  1.0
  Si  Si5  1  0.836  0.645  0.500  1.0
  Si  Si6  1  0.989  0.011  0.237  1.0
  Si  Si7  1  0.989  0.011  0.763  1.0
  W  W8  1  0.331  0.669  0.310  1.0
  W  W9  1  0.662  0.338  0.182  1.0
  W  W10  1  0.662  0.338  0.818  1.0
  W  W11  1  0.331  0.669  0.690  1.0
[/CIF]
.
The structure described by WFeSi is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the orthorhombic Amm2 space group. There are five inequivalent W sites. In the first W site, W(1) is bonded in a 16-coordinate geometry to one W(1), three equivalent W(2), one Fe(1), two equivalent Fe(2), two equivalent Fe(3), three equivalent Si(2), and four equivalent Si(1) atoms. In the second W site, W(2) is bonded in a 16-coordinate geometry to one W(2); three W(1,1); one Fe(3); two equivalent Fe(1); four equivalent Fe(2); two equivalent Si(1); and three equivalent Si(2) atoms. In the third W site, W(2) is bonded in a 16-coordinate geometry to one W(2); three W(1,1); one Fe(3); two equivalent Fe(1); four equivalent Fe(2); two equivalent Si(1); and three equivalent Si(2) atoms. In the fourth W site, W(1) is bonded in a 16-coordinate geometry to one W(1), three equivalent W(2), one Fe(1), two equivalent Fe(2), two equivalent Fe(3), three equivalent Si(2), and four equivalent Si(1) atoms. In the fifth W site, W(1) is bonded in a 16-coordinate geometry to one W(1), three equivalent W(2), one Fe(1), two equivalent Fe(2), two equivalent Fe(3), three equivalent Si(2), and four equivalent Si(1) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent W(1); four W(2,2); four equivalent Fe(2); and two equivalent Si(2) atoms to form FeFe4Si2W6 cuboctahedra that share corners with two equivalent Fe(3)Si6W6 cuboctahedra, corners with four equivalent Fe(1)Fe4Si2W6 cuboctahedra, corners with four equivalent Si(2)Fe4Si2W6 cuboctahedra, corners with eight equivalent Si(1)Fe2Si4W6 cuboctahedra, edges with two equivalent Fe(1)Fe4Si2W6 cuboctahedra, edges with four equivalent Fe(3)Si6W6 cuboctahedra, faces with four equivalent Si(1)Fe2Si4W6 cuboctahedra, faces with six equivalent Si(2)Fe4Si2W6 cuboctahedra, and faces with eight equivalent Fe(2)Fe4Si2W6 cuboctahedra. In the second Fe site, Fe(2) is bonded to two equivalent W(1); four W(2,2); two equivalent Fe(1); two equivalent Fe(2); and two equivalent Si(2) atoms to form distorted FeFe4Si2W6 cuboctahedra that share corners with four equivalent Fe(2)Fe4Si2W6 cuboctahedra, corners with four equivalent Fe(3)Si6W6 cuboctahedra, corners with four equivalent Si(2)Fe4Si2W6 cuboctahedra, corners with six equivalent Si(1)Fe2Si4W6 cuboctahedra, edges with two equivalent Fe(2)Fe4Si2W6 cuboctahedra, edges with four equivalent Si(1)Fe2Si4W6 cuboctahedra, faces with two equivalent Fe(3)Si6W6 cuboctahedra, faces with two equivalent Si(1)Fe2Si4W6 cuboctahedra, faces with four equivalent Fe(1)Fe4Si2W6 cuboctahedra, faces with four equivalent Fe(2)Fe4Si2W6 cuboctahedra, and faces with six equivalent Si(2)Fe4Si2W6 cuboctahedra. In the third Fe site, Fe(3) is bonded to two W(2,2); four W(1,1); two equivalent Si(2); and four equivalent Si(1) atoms to form distorted FeSi6W6 cuboctahedra that share corners with two equivalent Fe(1)Fe4Si2W6 cuboctahedra, corners with four equivalent Fe(3)Si6W6 cuboctahedra, corners with four equivalent Si(2)Fe4Si2W6 cuboctahedra, corners with eight equivalent Fe(2)Fe4Si2W6 cuboctahedra, edges with two equivalent Fe(3)Si6W6 cuboctahedra, edges with four equivalent Fe(1)Fe4Si2W6 cuboctahedra, faces with four equivalent Fe(2)Fe4Si2W6 cuboctahedra, faces with six equivalent Si(2)Fe4Si2W6 cuboctahedra, and faces with eight equivalent Si(1)Fe2Si4W6 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to two W(2,2); four W(1,1,1); two equivalent Fe(3); two equivalent Si(1); and two equivalent Si(2) atoms to form distorted SiFe2Si4W6 cuboctahedra that share corners with four equivalent Fe(1)Fe4Si2W6 cuboctahedra, corners with four equivalent Si(1)Fe2Si4W6 cuboctahedra, corners with four equivalent Si(2)Fe4Si2W6 cuboctahedra, corners with six equivalent Fe(2)Fe4Si2W6 cuboctahedra, edges with two equivalent Si(1)Fe2Si4W6 cuboctahedra, edges with four equivalent Fe(2)Fe4Si2W6 cuboctahedra, faces with two equivalent Fe(1)Fe4Si2W6 cuboctahedra, faces with two equivalent Fe(2)Fe4Si2W6 cuboctahedra, faces with four equivalent Fe(3)Si6W6 cuboctahedra, faces with four equivalent Si(1)Fe2Si4W6 cuboctahedra, and faces with six equivalent Si(2)Fe4Si2W6 cuboctahedra. In the second Si site, Si(2) is bonded to three W(1,1); three equivalent W(2); one Fe(1); one Fe(3); two equivalent Fe(2); and two equivalent Si(1) atoms to form distorted SiFe4Si2W6 cuboctahedra that share corners with two equivalent Fe(1)Fe4Si2W6 cuboctahedra, corners with two equivalent Fe(3)Si6W6 cuboctahedra, corners with four equivalent Fe(2)Fe4Si2W6 cuboctahedra, corners with four equivalent Si(1)Fe2Si4W6 cuboctahedra, edges with six equivalent Si(2)Fe4Si2W6 cuboctahedra, faces with two equivalent Si(2)Fe4Si2W6 cuboctahedra, faces with three equivalent Fe(1)Fe4Si2W6 cuboctahedra, faces with three equivalent Fe(3)Si6W6 cuboctahedra, faces with six equivalent Fe(2)Fe4Si2W6 cuboctahedra, and faces with six equivalent Si(1)Fe2Si4W6 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_FeSiW
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.729
_cell_length_b   4.729
_cell_length_c   7.648
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   117.265
_symmetry_Int_Tables_number   1
_cell_volume   152.008
_cell_formula_units_Z   4
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  0.171  0.829  0.000  1.0
  Fe  Fe1  1  0.652  0.828  0.000  1.0
  Fe  Fe2  1  0.172  0.348  0.000  1.0
  Fe  Fe3  1  0.852  0.148  0.500  1.0
  Si  Si4  1  0.355  0.164  0.500  1.0
  Si  Si5  1  0.836  0.645  0.500  1.0
  Si  Si6  1  0.989  0.011  0.237  1.0
  Si  Si7  1  0.989  0.011  0.763  1.0
  W  W8  1  0.331  0.669  0.310  1.0
  W  W9  1  0.662  0.338  0.182  1.0
  W  W10  1  0.662  0.338  0.818  1.0
  W  W11  1  0.331  0.669  0.690  1.0
[/CIF]
.