The crystal structure described by Y2Fe17 crystallizes in the trigonal R-3m space group. Y(1) is bonded in a 19-coordinate geometry to one Fe(4), three equivalent Fe(1), six equivalent Fe(2), and nine equivalent Fe(3) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Y(1), two equivalent Fe(4), four equivalent Fe(2), and four equivalent Fe(3) atoms to form FeY2Fe10 cuboctahedra that share corners with four equivalent Fe(1)Y2Fe10 cuboctahedra, corners with ten equivalent Fe(3)Y3Fe9 cuboctahedra, edges with six equivalent Fe(3)Y3Fe9 cuboctahedra, faces with four equivalent Fe(1)Y2Fe10 cuboctahedra, and faces with six equivalent Fe(3)Y3Fe9 cuboctahedra. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to two equivalent Y(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(4), and four equivalent Fe(3) atoms. In the third Fe site, Fe(3) is bonded to three equivalent Y(1), one Fe(4), two equivalent Fe(1), two equivalent Fe(3), and four equivalent Fe(2) atoms to form FeY3Fe9 cuboctahedra that share corners with five equivalent Fe(1)Y2Fe10 cuboctahedra, corners with ten equivalent Fe(3)Y3Fe9 cuboctahedra, edges with three equivalent Fe(1)Y2Fe10 cuboctahedra, edges with five equivalent Fe(3)Y3Fe9 cuboctahedra, faces with three equivalent Fe(1)Y2Fe10 cuboctahedra, and faces with seven equivalent Fe(3)Y3Fe9 cuboctahedra. In the fourth Fe site, Fe(4) is bonded in a 14-coordinate geometry to one Y(1), one Fe(4), three equivalent Fe(1), three equivalent Fe(3), and six equivalent Fe(2) atoms. is represented by the CIF card [CIF]
data_Y2Fe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.423
_cell_length_b   6.423
_cell_length_c   6.423
_cell_angle_alpha   83.453
_cell_angle_beta   83.452
_cell_angle_gamma   83.453
_symmetry_Int_Tables_number   1
_cell_volume   260.116
_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
  Y  Y0  1  0.660  0.660  0.660  1.0
  Y  Y1  1  0.340  0.340  0.340  1.0
  Fe  Fe2  1  0.000  0.000  0.500  1.0
  Fe  Fe3  1  0.500  0.000  0.000  1.0
  Fe  Fe4  1  0.000  0.500  0.000  1.0
  Fe  Fe5  1  0.707  0.293  1.000  1.0
  Fe  Fe6  1  0.000  0.707  0.293  1.0
  Fe  Fe7  1  0.293  0.000  0.707  1.0
  Fe  Fe8  1  1.000  0.293  0.707  1.0
  Fe  Fe9  1  0.707  1.000  0.293  1.0
  Fe  Fe10  1  0.293  0.707  0.000  1.0
  Fe  Fe11  1  0.345  0.345  0.846  1.0
  Fe  Fe12  1  0.846  0.345  0.345  1.0
  Fe  Fe13  1  0.345  0.846  0.345  1.0
  Fe  Fe14  1  0.655  0.655  0.154  1.0
  Fe  Fe15  1  0.154  0.655  0.655  1.0
  Fe  Fe16  1  0.655  0.154  0.655  1.0
  Fe  Fe17  1  0.903  0.904  0.903  1.0
  Fe  Fe18  1  0.097  0.096  0.097  1.0
[/CIF]
.
The crystal structure described by Y2Fe17 crystallizes in the trigonal R-3m space group. Y(1) is bonded in a 19-coordinate geometry to one Fe(4), three equivalent Fe(1), six equivalent Fe(2), and nine equivalent Fe(3) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Y(1), two equivalent Fe(4), four equivalent Fe(2), and four equivalent Fe(3) atoms to form FeY2Fe10 cuboctahedra that share corners with four equivalent Fe(1)Y2Fe10 cuboctahedra, corners with ten equivalent Fe(3)Y3Fe9 cuboctahedra, edges with six equivalent Fe(3)Y3Fe9 cuboctahedra, faces with four equivalent Fe(1)Y2Fe10 cuboctahedra, and faces with six equivalent Fe(3)Y3Fe9 cuboctahedra. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to two equivalent Y(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(4), and four equivalent Fe(3) atoms. In the third Fe site, Fe(3) is bonded to three equivalent Y(1), one Fe(4), two equivalent Fe(1), two equivalent Fe(3), and four equivalent Fe(2) atoms to form FeY3Fe9 cuboctahedra that share corners with five equivalent Fe(1)Y2Fe10 cuboctahedra, corners with ten equivalent Fe(3)Y3Fe9 cuboctahedra, edges with three equivalent Fe(1)Y2Fe10 cuboctahedra, edges with five equivalent Fe(3)Y3Fe9 cuboctahedra, faces with three equivalent Fe(1)Y2Fe10 cuboctahedra, and faces with seven equivalent Fe(3)Y3Fe9 cuboctahedra. In the fourth Fe site, Fe(4) is bonded in a 14-coordinate geometry to one Y(1), one Fe(4), three equivalent Fe(1), three equivalent Fe(3), and six equivalent Fe(2) atoms. is represented by the CIF card [CIF]
data_Y2Fe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.423
_cell_length_b   6.423
_cell_length_c   6.423
_cell_angle_alpha   83.453
_cell_angle_beta   83.452
_cell_angle_gamma   83.453
_symmetry_Int_Tables_number   1
_cell_volume   260.116
_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
  Y  Y0  1  0.660  0.660  0.660  1.0
  Y  Y1  1  0.340  0.340  0.340  1.0
  Fe  Fe2  1  0.000  0.000  0.500  1.0
  Fe  Fe3  1  0.500  0.000  0.000  1.0
  Fe  Fe4  1  0.000  0.500  0.000  1.0
  Fe  Fe5  1  0.707  0.293  1.000  1.0
  Fe  Fe6  1  0.000  0.707  0.293  1.0
  Fe  Fe7  1  0.293  0.000  0.707  1.0
  Fe  Fe8  1  1.000  0.293  0.707  1.0
  Fe  Fe9  1  0.707  1.000  0.293  1.0
  Fe  Fe10  1  0.293  0.707  0.000  1.0
  Fe  Fe11  1  0.345  0.345  0.846  1.0
  Fe  Fe12  1  0.846  0.345  0.345  1.0
  Fe  Fe13  1  0.345  0.846  0.345  1.0
  Fe  Fe14  1  0.655  0.655  0.154  1.0
  Fe  Fe15  1  0.154  0.655  0.655  1.0
  Fe  Fe16  1  0.655  0.154  0.655  1.0
  Fe  Fe17  1  0.903  0.904  0.903  1.0
  Fe  Fe18  1  0.097  0.096  0.097  1.0
[/CIF]
.