The compound described by U6Al8(FeSi)5 crystallizes in the orthorhombic Immm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to two equivalent Al(2), two equivalent Al(3), and four equivalent Si(1) atoms. In the second U site, U(2) is bonded in a distorted single-bond geometry to one Fe(1), one Al(2), one Al(3), two equivalent Al(1), two equivalent Al(4), one Si(2), and two equivalent Si(1) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(2) is bonded in a 8-coordinate geometry to four equivalent Al(2) and four equivalent Si(1) atoms. In the second Fe site, Fe(1) is bonded in a 1-coordinate geometry to one U(2), one Al(3), and one Si(1) atom. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to four equivalent U(2), two equivalent Al(3), two equivalent Al(4), and two equivalent Si(2) atoms. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to two equivalent U(1), two equivalent U(2), two equivalent Fe(2), and four equivalent Si(1) atoms. In the third Al site, Al(3) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent U(2), two equivalent Fe(1), and two equivalent Al(1) atoms. In the fourth Al site, Al(4) is bonded in a 10-coordinate geometry to four equivalent U(2), two equivalent Al(1), two equivalent Si(1), and two equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent U(1), two equivalent U(2), one Fe(1), one Fe(2), one Al(4), and two equivalent Al(2) atoms. In the second Si site, Si(2) is bonded to four equivalent U(2), four equivalent Al(1), and four equivalent Al(4) atoms to form face-sharing SiU4Al8 cuboctahedra. is represented by the CIF card [CIF]
data_U6Al8(FeSi)5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.236
_cell_length_b   10.374
_cell_length_c   10.374
_cell_angle_alpha   71.868
_cell_angle_beta   78.218
_cell_angle_gamma   78.218
_symmetry_Int_Tables_number   1
_cell_volume   419.295
_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
  U  U0  1  0.852  0.148  0.148  1.0
  U  U1  1  0.148  0.852  0.852  1.0
  U  U2  1  0.869  0.818  0.444  1.0
  U  U3  1  0.131  0.556  0.182  1.0
  U  U4  1  0.869  0.444  0.818  1.0
  U  U5  1  0.131  0.182  0.556  1.0
  Al  Al6  1  0.621  0.379  0.379  1.0
  Al  Al7  1  0.379  0.621  0.621  1.0
  Al  Al8  1  0.000  0.861  0.139  1.0
  Al  Al9  1  0.000  0.139  0.861  1.0
  Al  Al10  1  0.767  0.733  0.733  1.0
  Al  Al11  1  0.233  0.267  0.267  1.0
  Al  Al12  1  0.500  0.331  0.669  1.0
  Al  Al13  1  0.500  0.669  0.331  1.0
  Fe  Fe14  1  0.738  0.961  0.563  1.0
  Fe  Fe15  1  0.262  0.437  0.039  1.0
  Fe  Fe16  1  0.738  0.563  0.961  1.0
  Fe  Fe17  1  0.262  0.039  0.437  1.0
  Fe  Fe18  1  0.500  0.000  0.000  1.0
  Si  Si19  1  0.597  0.051  0.755  1.0
  Si  Si20  1  0.403  0.245  0.949  1.0
  Si  Si21  1  0.597  0.755  0.051  1.0
  Si  Si22  1  0.403  0.949  0.245  1.0
  Si  Si23  1  0.000  0.500  0.500  1.0
[/CIF]
.
The compound described by U6Al8(FeSi)5 crystallizes in the orthorhombic Immm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to two equivalent Al(2), two equivalent Al(3), and four equivalent Si(1) atoms. In the second U site, U(2) is bonded in a distorted single-bond geometry to one Fe(1), one Al(2), one Al(3), two equivalent Al(1), two equivalent Al(4), one Si(2), and two equivalent Si(1) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(2) is bonded in a 8-coordinate geometry to four equivalent Al(2) and four equivalent Si(1) atoms. In the second Fe site, Fe(1) is bonded in a 1-coordinate geometry to one U(2), one Al(3), and one Si(1) atom. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to four equivalent U(2), two equivalent Al(3), two equivalent Al(4), and two equivalent Si(2) atoms. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to two equivalent U(1), two equivalent U(2), two equivalent Fe(2), and four equivalent Si(1) atoms. In the third Al site, Al(3) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent U(2), two equivalent Fe(1), and two equivalent Al(1) atoms. In the fourth Al site, Al(4) is bonded in a 10-coordinate geometry to four equivalent U(2), two equivalent Al(1), two equivalent Si(1), and two equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent U(1), two equivalent U(2), one Fe(1), one Fe(2), one Al(4), and two equivalent Al(2) atoms. In the second Si site, Si(2) is bonded to four equivalent U(2), four equivalent Al(1), and four equivalent Al(4) atoms to form face-sharing SiU4Al8 cuboctahedra. is represented by the CIF card [CIF]
data_U6Al8(FeSi)5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.236
_cell_length_b   10.374
_cell_length_c   10.374
_cell_angle_alpha   71.868
_cell_angle_beta   78.218
_cell_angle_gamma   78.218
_symmetry_Int_Tables_number   1
_cell_volume   419.295
_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
  U  U0  1  0.852  0.148  0.148  1.0
  U  U1  1  0.148  0.852  0.852  1.0
  U  U2  1  0.869  0.818  0.444  1.0
  U  U3  1  0.131  0.556  0.182  1.0
  U  U4  1  0.869  0.444  0.818  1.0
  U  U5  1  0.131  0.182  0.556  1.0
  Al  Al6  1  0.621  0.379  0.379  1.0
  Al  Al7  1  0.379  0.621  0.621  1.0
  Al  Al8  1  0.000  0.861  0.139  1.0
  Al  Al9  1  0.000  0.139  0.861  1.0
  Al  Al10  1  0.767  0.733  0.733  1.0
  Al  Al11  1  0.233  0.267  0.267  1.0
  Al  Al12  1  0.500  0.331  0.669  1.0
  Al  Al13  1  0.500  0.669  0.331  1.0
  Fe  Fe14  1  0.738  0.961  0.563  1.0
  Fe  Fe15  1  0.262  0.437  0.039  1.0
  Fe  Fe16  1  0.738  0.563  0.961  1.0
  Fe  Fe17  1  0.262  0.039  0.437  1.0
  Fe  Fe18  1  0.500  0.000  0.000  1.0
  Si  Si19  1  0.597  0.051  0.755  1.0
  Si  Si20  1  0.403  0.245  0.949  1.0
  Si  Si21  1  0.597  0.755  0.051  1.0
  Si  Si22  1  0.403  0.949  0.245  1.0
  Si  Si23  1  0.000  0.500  0.500  1.0
[/CIF]
.