The structure described by CeYFe17 crystallizes in the trigonal R3m space group. Ce(1) is bonded in a 19-coordinate geometry to one Fe(5), three equivalent Fe(1), three equivalent Fe(4), six equivalent Fe(2), and six equivalent Fe(3) atoms. Y(1) is bonded in a 19-coordinate geometry to one Fe(6), three equivalent Fe(2), three equivalent Fe(4), six equivalent Fe(1), and six equivalent Fe(3) atoms. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one Ce(1), two equivalent Y(1), one Fe(6), two equivalent Fe(2), two equivalent Fe(4), and four equivalent Fe(3) atoms to form FeCeY2Fe9 cuboctahedra that share corners with two equivalent Fe(1)CeY2Fe9 cuboctahedra, corners with five equivalent Fe(4)CeYFe10 cuboctahedra, corners with eight equivalent Fe(2)Ce2YFe9 cuboctahedra,  an edgeedge with one Fe(2)Ce2YFe9 cuboctahedra, edges with three equivalent Fe(4)CeYFe10 cuboctahedra, edges with four equivalent Fe(1)CeY2Fe9 cuboctahedra, faces with three equivalent Fe(2)Ce2YFe9 cuboctahedra, faces with three equivalent Fe(4)CeYFe10 cuboctahedra, and faces with four equivalent Fe(1)CeY2Fe9 cuboctahedra. In the second Fe site, Fe(2) is bonded to two equivalent Ce(1), one Y(1), one Fe(5), two equivalent Fe(1), two equivalent Fe(4), and four equivalent Fe(3) atoms to form FeCe2YFe9 cuboctahedra that share corners with two equivalent Fe(2)Ce2YFe9 cuboctahedra, corners with five equivalent Fe(4)CeYFe10 cuboctahedra, corners with eight equivalent Fe(1)CeY2Fe9 cuboctahedra,  an edgeedge with one Fe(1)CeY2Fe9 cuboctahedra, edges with three equivalent Fe(4)CeYFe10 cuboctahedra, edges with four equivalent Fe(2)Ce2YFe9 cuboctahedra, faces with three equivalent Fe(1)CeY2Fe9 cuboctahedra, faces with three equivalent Fe(4)CeYFe10 cuboctahedra, and faces with four equivalent Fe(2)Ce2YFe9 cuboctahedra. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Ce(1), one Y(1), one Fe(5), one Fe(6), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(4) atoms. In the fourth Fe site, Fe(4) is bonded to one Ce(1), one Y(1), one Fe(5), one Fe(6), two equivalent Fe(1), two equivalent Fe(2), and four equivalent Fe(3) atoms to form FeCeYFe10 cuboctahedra that share corners with four equivalent Fe(4)CeYFe10 cuboctahedra, corners with five equivalent Fe(2)Ce2YFe9 cuboctahedra, corners with five equivalent Fe(1)CeY2Fe9 cuboctahedra, edges with three equivalent Fe(2)Ce2YFe9 cuboctahedra, edges with three equivalent Fe(1)CeY2Fe9 cuboctahedra, faces with three equivalent Fe(2)Ce2YFe9 cuboctahedra, faces with three equivalent Fe(1)CeY2Fe9 cuboctahedra, and faces with four equivalent Fe(4)CeYFe10 cuboctahedra. In the fifth Fe site, Fe(5) is bonded in a 14-coordinate geometry to one Ce(1), one Fe(6), three equivalent Fe(2), three equivalent Fe(4), and six equivalent Fe(3) atoms. In the sixth Fe site, Fe(6) is bonded in a 14-coordinate geometry to one Y(1), one Fe(5), three equivalent Fe(1), three equivalent Fe(4), and six equivalent Fe(3) atoms. is represented by the CIF card [CIF]
data_CeYFe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.429
_cell_length_b   6.429
_cell_length_c   6.429
_cell_angle_alpha   82.516
_cell_angle_beta   82.516
_cell_angle_gamma   82.516
_symmetry_Int_Tables_number   1
_cell_volume   259.536
_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
  Ce  Ce0  1  0.657  0.657  0.657  1.0
  Y  Y1  1  0.341  0.341  0.341  1.0
  Fe  Fe2  1  0.344  0.843  0.344  1.0
  Fe  Fe3  1  0.344  0.344  0.843  1.0
  Fe  Fe4  1  0.843  0.344  0.344  1.0
  Fe  Fe5  1  0.656  0.156  0.656  1.0
  Fe  Fe6  1  0.656  0.656  0.156  1.0
  Fe  Fe7  1  0.156  0.656  0.656  1.0
  Fe  Fe8  1  0.707  0.293  0.000  1.0
  Fe  Fe9  1  0.000  0.707  0.293  1.0
  Fe  Fe10  1  0.293  0.000  0.707  1.0
  Fe  Fe11  1  0.000  0.293  0.707  1.0
  Fe  Fe12  1  0.707  0.000  0.293  1.0
  Fe  Fe13  1  0.293  0.707  0.000  1.0
  Fe  Fe14  1  0.001  0.001  0.500  1.0
  Fe  Fe15  1  0.500  0.001  0.001  1.0
  Fe  Fe16  1  0.001  0.500  0.001  1.0
  Fe  Fe17  1  0.903  0.903  0.903  1.0
  Fe  Fe18  1  0.097  0.097  0.097  1.0
[/CIF]
.
The structure described by CeYFe17 crystallizes in the trigonal R3m space group. Ce(1) is bonded in a 19-coordinate geometry to one Fe(5), three equivalent Fe(1), three equivalent Fe(4), six equivalent Fe(2), and six equivalent Fe(3) atoms. Y(1) is bonded in a 19-coordinate geometry to one Fe(6), three equivalent Fe(2), three equivalent Fe(4), six equivalent Fe(1), and six equivalent Fe(3) atoms. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one Ce(1), two equivalent Y(1), one Fe(6), two equivalent Fe(2), two equivalent Fe(4), and four equivalent Fe(3) atoms to form FeCeY2Fe9 cuboctahedra that share corners with two equivalent Fe(1)CeY2Fe9 cuboctahedra, corners with five equivalent Fe(4)CeYFe10 cuboctahedra, corners with eight equivalent Fe(2)Ce2YFe9 cuboctahedra,  an edgeedge with one Fe(2)Ce2YFe9 cuboctahedra, edges with three equivalent Fe(4)CeYFe10 cuboctahedra, edges with four equivalent Fe(1)CeY2Fe9 cuboctahedra, faces with three equivalent Fe(2)Ce2YFe9 cuboctahedra, faces with three equivalent Fe(4)CeYFe10 cuboctahedra, and faces with four equivalent Fe(1)CeY2Fe9 cuboctahedra. In the second Fe site, Fe(2) is bonded to two equivalent Ce(1), one Y(1), one Fe(5), two equivalent Fe(1), two equivalent Fe(4), and four equivalent Fe(3) atoms to form FeCe2YFe9 cuboctahedra that share corners with two equivalent Fe(2)Ce2YFe9 cuboctahedra, corners with five equivalent Fe(4)CeYFe10 cuboctahedra, corners with eight equivalent Fe(1)CeY2Fe9 cuboctahedra,  an edgeedge with one Fe(1)CeY2Fe9 cuboctahedra, edges with three equivalent Fe(4)CeYFe10 cuboctahedra, edges with four equivalent Fe(2)Ce2YFe9 cuboctahedra, faces with three equivalent Fe(1)CeY2Fe9 cuboctahedra, faces with three equivalent Fe(4)CeYFe10 cuboctahedra, and faces with four equivalent Fe(2)Ce2YFe9 cuboctahedra. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Ce(1), one Y(1), one Fe(5), one Fe(6), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(4) atoms. In the fourth Fe site, Fe(4) is bonded to one Ce(1), one Y(1), one Fe(5), one Fe(6), two equivalent Fe(1), two equivalent Fe(2), and four equivalent Fe(3) atoms to form FeCeYFe10 cuboctahedra that share corners with four equivalent Fe(4)CeYFe10 cuboctahedra, corners with five equivalent Fe(2)Ce2YFe9 cuboctahedra, corners with five equivalent Fe(1)CeY2Fe9 cuboctahedra, edges with three equivalent Fe(2)Ce2YFe9 cuboctahedra, edges with three equivalent Fe(1)CeY2Fe9 cuboctahedra, faces with three equivalent Fe(2)Ce2YFe9 cuboctahedra, faces with three equivalent Fe(1)CeY2Fe9 cuboctahedra, and faces with four equivalent Fe(4)CeYFe10 cuboctahedra. In the fifth Fe site, Fe(5) is bonded in a 14-coordinate geometry to one Ce(1), one Fe(6), three equivalent Fe(2), three equivalent Fe(4), and six equivalent Fe(3) atoms. In the sixth Fe site, Fe(6) is bonded in a 14-coordinate geometry to one Y(1), one Fe(5), three equivalent Fe(1), three equivalent Fe(4), and six equivalent Fe(3) atoms. is represented by the CIF card [CIF]
data_CeYFe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.429
_cell_length_b   6.429
_cell_length_c   6.429
_cell_angle_alpha   82.516
_cell_angle_beta   82.516
_cell_angle_gamma   82.516
_symmetry_Int_Tables_number   1
_cell_volume   259.536
_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
  Ce  Ce0  1  0.657  0.657  0.657  1.0
  Y  Y1  1  0.341  0.341  0.341  1.0
  Fe  Fe2  1  0.344  0.843  0.344  1.0
  Fe  Fe3  1  0.344  0.344  0.843  1.0
  Fe  Fe4  1  0.843  0.344  0.344  1.0
  Fe  Fe5  1  0.656  0.156  0.656  1.0
  Fe  Fe6  1  0.656  0.656  0.156  1.0
  Fe  Fe7  1  0.156  0.656  0.656  1.0
  Fe  Fe8  1  0.707  0.293  0.000  1.0
  Fe  Fe9  1  0.000  0.707  0.293  1.0
  Fe  Fe10  1  0.293  0.000  0.707  1.0
  Fe  Fe11  1  0.000  0.293  0.707  1.0
  Fe  Fe12  1  0.707  0.000  0.293  1.0
  Fe  Fe13  1  0.293  0.707  0.000  1.0
  Fe  Fe14  1  0.001  0.001  0.500  1.0
  Fe  Fe15  1  0.500  0.001  0.001  1.0
  Fe  Fe16  1  0.001  0.500  0.001  1.0
  Fe  Fe17  1  0.903  0.903  0.903  1.0
  Fe  Fe18  1  0.097  0.097  0.097  1.0
[/CIF]
.