The material described by Pr2Fe17 crystallizes in the trigonal R-3m space group. Pr(1) is bonded in a 19-coordinate geometry to one Fe(2), three equivalent Fe(3), six equivalent Fe(4), and nine equivalent Fe(1) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to three equivalent Pr(1), one Fe(2), two equivalent Fe(1), two equivalent Fe(3), and four equivalent Fe(4) atoms to form FePr3Fe9 cuboctahedra that share corners with five equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with eight equivalent Fe(4)Pr2Fe10 cuboctahedra, corners with ten equivalent Fe(1)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(4)Pr2Fe10 cuboctahedra, edges with three equivalent Fe(3)Pr2Fe10 cuboctahedra, edges with five equivalent Fe(1)Pr3Fe9 cuboctahedra, faces with three equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with seven equivalent Fe(1)Pr3Fe9 cuboctahedra, and faces with ten equivalent Fe(4)Pr2Fe10 cuboctahedra. In the second Fe site, Fe(2) is bonded in a 14-coordinate geometry to one Pr(1), one Fe(2), three equivalent Fe(1), three equivalent Fe(3), and six equivalent Fe(4) atoms. In the third Fe site, Fe(3) is bonded to two equivalent Pr(1), two equivalent Fe(2), four equivalent Fe(1), and four equivalent Fe(4) atoms to form FePr2Fe10 cuboctahedra that share corners with four equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with eight equivalent Fe(4)Pr2Fe10 cuboctahedra, corners with ten equivalent Fe(1)Pr3Fe9 cuboctahedra, edges with four equivalent Fe(4)Pr2Fe10 cuboctahedra, edges with six equivalent Fe(1)Pr3Fe9 cuboctahedra, faces with four equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with six equivalent Fe(1)Pr3Fe9 cuboctahedra, and faces with eight equivalent Fe(4)Pr2Fe10 cuboctahedra. In the fourth Fe site, Fe(4) is bonded to two equivalent Pr(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and four equivalent Fe(1) atoms to form distorted FePr2Fe10 cuboctahedra that share corners with four equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with eight equivalent Fe(1)Pr3Fe9 cuboctahedra, corners with twelve equivalent Fe(4)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(4)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(3)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(1)Pr3Fe9 cuboctahedra, faces with four equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with seven equivalent Fe(4)Pr2Fe10 cuboctahedra, and faces with ten equivalent Fe(1)Pr3Fe9 cuboctahedra. is represented by the CIF file [CIF]
data_Pr2Fe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.486
_cell_length_b   6.486
_cell_length_c   6.486
_cell_angle_alpha   83.030
_cell_angle_beta   83.030
_cell_angle_gamma   83.030
_symmetry_Int_Tables_number   1
_cell_volume   267.203
_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
  Pr  Pr0  1  0.659  0.659  0.659  1.0
  Pr  Pr1  1  0.341  0.341  0.341  1.0
  Fe  Fe2  1  0.341  0.341  0.846  1.0
  Fe  Fe3  1  0.846  0.341  0.341  1.0
  Fe  Fe4  1  0.096  0.096  0.096  1.0
  Fe  Fe5  1  0.904  0.904  0.904  1.0
  Fe  Fe6  1  0.000  0.000  0.500  1.0
  Fe  Fe7  1  0.000  0.500  0.000  1.0
  Fe  Fe8  1  0.500  0.000  0.000  1.0
  Fe  Fe9  1  0.712  0.288  0.000  1.0
  Fe  Fe10  1  0.288  0.000  0.712  1.0
  Fe  Fe11  1  0.000  0.712  0.288  1.0
  Fe  Fe12  1  0.288  0.712  0.000  1.0
  Fe  Fe13  1  0.712  0.000  0.288  1.0
  Fe  Fe14  1  0.000  0.288  0.712  1.0
  Fe  Fe15  1  0.154  0.659  0.659  1.0
  Fe  Fe16  1  0.659  0.659  0.154  1.0
  Fe  Fe17  1  0.659  0.154  0.659  1.0
  Fe  Fe18  1  0.341  0.846  0.341  1.0
[/CIF]
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The material described by Pr2Fe17 crystallizes in the trigonal R-3m space group. Pr(1) is bonded in a 19-coordinate geometry to one Fe(2), three equivalent Fe(3), six equivalent Fe(4), and nine equivalent Fe(1) atoms. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to three equivalent Pr(1), one Fe(2), two equivalent Fe(1), two equivalent Fe(3), and four equivalent Fe(4) atoms to form FePr3Fe9 cuboctahedra that share corners with five equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with eight equivalent Fe(4)Pr2Fe10 cuboctahedra, corners with ten equivalent Fe(1)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(4)Pr2Fe10 cuboctahedra, edges with three equivalent Fe(3)Pr2Fe10 cuboctahedra, edges with five equivalent Fe(1)Pr3Fe9 cuboctahedra, faces with three equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with seven equivalent Fe(1)Pr3Fe9 cuboctahedra, and faces with ten equivalent Fe(4)Pr2Fe10 cuboctahedra. In the second Fe site, Fe(2) is bonded in a 14-coordinate geometry to one Pr(1), one Fe(2), three equivalent Fe(1), three equivalent Fe(3), and six equivalent Fe(4) atoms. In the third Fe site, Fe(3) is bonded to two equivalent Pr(1), two equivalent Fe(2), four equivalent Fe(1), and four equivalent Fe(4) atoms to form FePr2Fe10 cuboctahedra that share corners with four equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with eight equivalent Fe(4)Pr2Fe10 cuboctahedra, corners with ten equivalent Fe(1)Pr3Fe9 cuboctahedra, edges with four equivalent Fe(4)Pr2Fe10 cuboctahedra, edges with six equivalent Fe(1)Pr3Fe9 cuboctahedra, faces with four equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with six equivalent Fe(1)Pr3Fe9 cuboctahedra, and faces with eight equivalent Fe(4)Pr2Fe10 cuboctahedra. In the fourth Fe site, Fe(4) is bonded to two equivalent Pr(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and four equivalent Fe(1) atoms to form distorted FePr2Fe10 cuboctahedra that share corners with four equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with eight equivalent Fe(1)Pr3Fe9 cuboctahedra, corners with twelve equivalent Fe(4)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(4)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(3)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(1)Pr3Fe9 cuboctahedra, faces with four equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with seven equivalent Fe(4)Pr2Fe10 cuboctahedra, and faces with ten equivalent Fe(1)Pr3Fe9 cuboctahedra. is represented by the CIF file [CIF]
data_Pr2Fe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.486
_cell_length_b   6.486
_cell_length_c   6.486
_cell_angle_alpha   83.030
_cell_angle_beta   83.030
_cell_angle_gamma   83.030
_symmetry_Int_Tables_number   1
_cell_volume   267.203
_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
  Pr  Pr0  1  0.659  0.659  0.659  1.0
  Pr  Pr1  1  0.341  0.341  0.341  1.0
  Fe  Fe2  1  0.341  0.341  0.846  1.0
  Fe  Fe3  1  0.846  0.341  0.341  1.0
  Fe  Fe4  1  0.096  0.096  0.096  1.0
  Fe  Fe5  1  0.904  0.904  0.904  1.0
  Fe  Fe6  1  0.000  0.000  0.500  1.0
  Fe  Fe7  1  0.000  0.500  0.000  1.0
  Fe  Fe8  1  0.500  0.000  0.000  1.0
  Fe  Fe9  1  0.712  0.288  0.000  1.0
  Fe  Fe10  1  0.288  0.000  0.712  1.0
  Fe  Fe11  1  0.000  0.712  0.288  1.0
  Fe  Fe12  1  0.288  0.712  0.000  1.0
  Fe  Fe13  1  0.712  0.000  0.288  1.0
  Fe  Fe14  1  0.000  0.288  0.712  1.0
  Fe  Fe15  1  0.154  0.659  0.659  1.0
  Fe  Fe16  1  0.659  0.659  0.154  1.0
  Fe  Fe17  1  0.659  0.154  0.659  1.0
  Fe  Fe18  1  0.341  0.846  0.341  1.0
[/CIF]
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