The structure described by Yb2Fe17 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 18-coordinate geometry to six equivalent Fe(3) and twelve equivalent Fe(4) atoms. In the second Yb site, Yb(2) is bonded in a 20-coordinate geometry to two equivalent Fe(1), six equivalent Fe(2), six equivalent Fe(3), and six equivalent Fe(4) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 14-coordinate geometry to one Yb(2), one Fe(1), three equivalent Fe(2), three equivalent Fe(4), and six equivalent Fe(3) atoms. In the second Fe site, Fe(2) is bonded to two equivalent Yb(2), two equivalent Fe(1), four equivalent Fe(3), and four equivalent Fe(4) atoms to form FeYb2Fe10 cuboctahedra that share corners with four equivalent Fe(2)Yb2Fe10 cuboctahedra, corners with ten equivalent Fe(4)Yb3Fe9 cuboctahedra, edges with six equivalent Fe(4)Yb3Fe9 cuboctahedra, faces with four equivalent Fe(4)Yb3Fe9 cuboctahedra, and faces with six equivalent Fe(2)Yb2Fe10 cuboctahedra. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Yb(1), one Yb(2), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), and four equivalent Fe(4) atoms. In the fourth Fe site, Fe(4) is bonded to one Yb(2), two equivalent Yb(1), one Fe(1), two equivalent Fe(2), two equivalent Fe(4), and four equivalent Fe(3) atoms to form distorted FeYb3Fe9 cuboctahedra that share corners with five equivalent Fe(2)Yb2Fe10 cuboctahedra, corners with ten equivalent Fe(4)Yb3Fe9 cuboctahedra, edges with three equivalent Fe(2)Yb2Fe10 cuboctahedra, edges with five equivalent Fe(4)Yb3Fe9 cuboctahedra, faces with two equivalent Fe(2)Yb2Fe10 cuboctahedra, and faces with eight equivalent Fe(4)Yb3Fe9 cuboctahedra. is represented by the CIF file [CIF]
data_Yb2Fe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.487
_cell_length_b   8.487
_cell_length_c   8.242
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   514.073
_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
  Yb  Yb0  1  0.000  0.000  0.250  1.0
  Yb  Yb1  1  0.000  0.000  0.750  1.0
  Yb  Yb2  1  0.333  0.667  0.750  1.0
  Yb  Yb3  1  0.667  0.333  0.250  1.0
  Fe  Fe4  1  0.333  0.667  0.397  1.0
  Fe  Fe5  1  0.667  0.333  0.603  1.0
  Fe  Fe6  1  0.667  0.333  0.897  1.0
  Fe  Fe7  1  0.333  0.667  0.103  1.0
  Fe  Fe8  1  0.500  0.500  0.500  1.0
  Fe  Fe9  1  0.500  0.000  0.500  1.0
  Fe  Fe10  1  0.000  0.500  0.500  1.0
  Fe  Fe11  1  0.500  0.500  0.000  1.0
  Fe  Fe12  1  0.500  0.000  0.000  1.0
  Fe  Fe13  1  0.000  0.500  0.000  1.0
  Fe  Fe14  1  0.328  0.373  0.250  1.0
  Fe  Fe15  1  0.627  0.955  0.250  1.0
  Fe  Fe16  1  0.045  0.672  0.250  1.0
  Fe  Fe17  1  0.627  0.672  0.250  1.0
  Fe  Fe18  1  0.045  0.373  0.250  1.0
  Fe  Fe19  1  0.328  0.955  0.250  1.0
  Fe  Fe20  1  0.672  0.627  0.750  1.0
  Fe  Fe21  1  0.373  0.045  0.750  1.0
  Fe  Fe22  1  0.955  0.328  0.750  1.0
  Fe  Fe23  1  0.373  0.328  0.750  1.0
  Fe  Fe24  1  0.955  0.627  0.750  1.0
  Fe  Fe25  1  0.672  0.045  0.750  1.0
  Fe  Fe26  1  0.166  0.834  0.519  1.0
  Fe  Fe27  1  0.166  0.332  0.519  1.0
  Fe  Fe28  1  0.668  0.834  0.519  1.0
  Fe  Fe29  1  0.834  0.166  0.481  1.0
  Fe  Fe30  1  0.834  0.668  0.481  1.0
  Fe  Fe31  1  0.332  0.166  0.481  1.0
  Fe  Fe32  1  0.834  0.166  0.019  1.0
  Fe  Fe33  1  0.834  0.668  0.019  1.0
  Fe  Fe34  1  0.332  0.166  0.019  1.0
  Fe  Fe35  1  0.166  0.834  0.981  1.0
  Fe  Fe36  1  0.166  0.332  0.981  1.0
  Fe  Fe37  1  0.668  0.834  0.981  1.0
[/CIF]
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The structure described by Yb2Fe17 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 18-coordinate geometry to six equivalent Fe(3) and twelve equivalent Fe(4) atoms. In the second Yb site, Yb(2) is bonded in a 20-coordinate geometry to two equivalent Fe(1), six equivalent Fe(2), six equivalent Fe(3), and six equivalent Fe(4) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 14-coordinate geometry to one Yb(2), one Fe(1), three equivalent Fe(2), three equivalent Fe(4), and six equivalent Fe(3) atoms. In the second Fe site, Fe(2) is bonded to two equivalent Yb(2), two equivalent Fe(1), four equivalent Fe(3), and four equivalent Fe(4) atoms to form FeYb2Fe10 cuboctahedra that share corners with four equivalent Fe(2)Yb2Fe10 cuboctahedra, corners with ten equivalent Fe(4)Yb3Fe9 cuboctahedra, edges with six equivalent Fe(4)Yb3Fe9 cuboctahedra, faces with four equivalent Fe(4)Yb3Fe9 cuboctahedra, and faces with six equivalent Fe(2)Yb2Fe10 cuboctahedra. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Yb(1), one Yb(2), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), and four equivalent Fe(4) atoms. In the fourth Fe site, Fe(4) is bonded to one Yb(2), two equivalent Yb(1), one Fe(1), two equivalent Fe(2), two equivalent Fe(4), and four equivalent Fe(3) atoms to form distorted FeYb3Fe9 cuboctahedra that share corners with five equivalent Fe(2)Yb2Fe10 cuboctahedra, corners with ten equivalent Fe(4)Yb3Fe9 cuboctahedra, edges with three equivalent Fe(2)Yb2Fe10 cuboctahedra, edges with five equivalent Fe(4)Yb3Fe9 cuboctahedra, faces with two equivalent Fe(2)Yb2Fe10 cuboctahedra, and faces with eight equivalent Fe(4)Yb3Fe9 cuboctahedra. is represented by the CIF file [CIF]
data_Yb2Fe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.487
_cell_length_b   8.487
_cell_length_c   8.242
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   514.073
_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
  Yb  Yb0  1  0.000  0.000  0.250  1.0
  Yb  Yb1  1  0.000  0.000  0.750  1.0
  Yb  Yb2  1  0.333  0.667  0.750  1.0
  Yb  Yb3  1  0.667  0.333  0.250  1.0
  Fe  Fe4  1  0.333  0.667  0.397  1.0
  Fe  Fe5  1  0.667  0.333  0.603  1.0
  Fe  Fe6  1  0.667  0.333  0.897  1.0
  Fe  Fe7  1  0.333  0.667  0.103  1.0
  Fe  Fe8  1  0.500  0.500  0.500  1.0
  Fe  Fe9  1  0.500  0.000  0.500  1.0
  Fe  Fe10  1  0.000  0.500  0.500  1.0
  Fe  Fe11  1  0.500  0.500  0.000  1.0
  Fe  Fe12  1  0.500  0.000  0.000  1.0
  Fe  Fe13  1  0.000  0.500  0.000  1.0
  Fe  Fe14  1  0.328  0.373  0.250  1.0
  Fe  Fe15  1  0.627  0.955  0.250  1.0
  Fe  Fe16  1  0.045  0.672  0.250  1.0
  Fe  Fe17  1  0.627  0.672  0.250  1.0
  Fe  Fe18  1  0.045  0.373  0.250  1.0
  Fe  Fe19  1  0.328  0.955  0.250  1.0
  Fe  Fe20  1  0.672  0.627  0.750  1.0
  Fe  Fe21  1  0.373  0.045  0.750  1.0
  Fe  Fe22  1  0.955  0.328  0.750  1.0
  Fe  Fe23  1  0.373  0.328  0.750  1.0
  Fe  Fe24  1  0.955  0.627  0.750  1.0
  Fe  Fe25  1  0.672  0.045  0.750  1.0
  Fe  Fe26  1  0.166  0.834  0.519  1.0
  Fe  Fe27  1  0.166  0.332  0.519  1.0
  Fe  Fe28  1  0.668  0.834  0.519  1.0
  Fe  Fe29  1  0.834  0.166  0.481  1.0
  Fe  Fe30  1  0.834  0.668  0.481  1.0
  Fe  Fe31  1  0.332  0.166  0.481  1.0
  Fe  Fe32  1  0.834  0.166  0.019  1.0
  Fe  Fe33  1  0.834  0.668  0.019  1.0
  Fe  Fe34  1  0.332  0.166  0.019  1.0
  Fe  Fe35  1  0.166  0.834  0.981  1.0
  Fe  Fe36  1  0.166  0.332  0.981  1.0
  Fe  Fe37  1  0.668  0.834  0.981  1.0
[/CIF]
.