The compound described by Ce2Fe17 crystallizes in the trigonal R-3m space group. Ce(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 Ce(1), one Fe(2), two equivalent Fe(1), two equivalent Fe(3), and four equivalent Fe(4) atoms to form FeCe3Fe9 cuboctahedra that share corners with five equivalent Fe(3)Ce2Fe10 cuboctahedra, corners with ten equivalent Fe(1)Ce3Fe9 cuboctahedra, edges with three equivalent Fe(3)Ce2Fe10 cuboctahedra, edges with five equivalent Fe(1)Ce3Fe9 cuboctahedra, faces with three equivalent Fe(3)Ce2Fe10 cuboctahedra, and faces with seven equivalent Fe(1)Ce3Fe9 cuboctahedra. In the second Fe site, Fe(2) is bonded in a 14-coordinate geometry to one Ce(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 Ce(1), two equivalent Fe(2), four equivalent Fe(1), and four equivalent Fe(4) atoms to form FeCe2Fe10 cuboctahedra that share corners with four equivalent Fe(3)Ce2Fe10 cuboctahedra, corners with ten equivalent Fe(1)Ce3Fe9 cuboctahedra, edges with six equivalent Fe(1)Ce3Fe9 cuboctahedra, faces with four equivalent Fe(3)Ce2Fe10 cuboctahedra, and faces with six equivalent Fe(1)Ce3Fe9 cuboctahedra. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and four equivalent Fe(1) atoms. is represented by the CIF file [CIF]
data_Ce2Fe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.431
_cell_length_b   6.431
_cell_length_c   6.431
_cell_angle_alpha   81.849
_cell_angle_beta   81.849
_cell_angle_gamma   81.849
_symmetry_Int_Tables_number   1
_cell_volume   258.660
_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  0.658  0.658  0.658  1.0
  Ce  Ce1  1  0.342  0.342  0.342  1.0
  Fe  Fe2  1  0.342  0.342  0.844  1.0
  Fe  Fe3  1  0.342  0.844  0.342  1.0
  Fe  Fe4  1  0.095  0.095  0.095  1.0
  Fe  Fe5  1  0.905  0.905  0.905  1.0
  Fe  Fe6  1  0.000  0.000  0.500  1.0
  Fe  Fe7  1  0.500  0.000  0.000  1.0
  Fe  Fe8  1  0.000  0.500  0.000  1.0
  Fe  Fe9  1  0.296  0.704  0.000  1.0
  Fe  Fe10  1  0.000  0.296  0.704  1.0
  Fe  Fe11  1  0.704  0.000  0.296  1.0
  Fe  Fe12  1  0.704  0.296  0.000  1.0
  Fe  Fe13  1  0.000  0.704  0.296  1.0
  Fe  Fe14  1  0.296  0.000  0.704  1.0
  Fe  Fe15  1  0.658  0.156  0.658  1.0
  Fe  Fe16  1  0.658  0.658  0.156  1.0
  Fe  Fe17  1  0.156  0.658  0.658  1.0
  Fe  Fe18  1  0.844  0.342  0.342  1.0
[/CIF]
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The compound described by Ce2Fe17 crystallizes in the trigonal R-3m space group. Ce(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 Ce(1), one Fe(2), two equivalent Fe(1), two equivalent Fe(3), and four equivalent Fe(4) atoms to form FeCe3Fe9 cuboctahedra that share corners with five equivalent Fe(3)Ce2Fe10 cuboctahedra, corners with ten equivalent Fe(1)Ce3Fe9 cuboctahedra, edges with three equivalent Fe(3)Ce2Fe10 cuboctahedra, edges with five equivalent Fe(1)Ce3Fe9 cuboctahedra, faces with three equivalent Fe(3)Ce2Fe10 cuboctahedra, and faces with seven equivalent Fe(1)Ce3Fe9 cuboctahedra. In the second Fe site, Fe(2) is bonded in a 14-coordinate geometry to one Ce(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 Ce(1), two equivalent Fe(2), four equivalent Fe(1), and four equivalent Fe(4) atoms to form FeCe2Fe10 cuboctahedra that share corners with four equivalent Fe(3)Ce2Fe10 cuboctahedra, corners with ten equivalent Fe(1)Ce3Fe9 cuboctahedra, edges with six equivalent Fe(1)Ce3Fe9 cuboctahedra, faces with four equivalent Fe(3)Ce2Fe10 cuboctahedra, and faces with six equivalent Fe(1)Ce3Fe9 cuboctahedra. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to two equivalent Ce(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and four equivalent Fe(1) atoms. is represented by the CIF file [CIF]
data_Ce2Fe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.431
_cell_length_b   6.431
_cell_length_c   6.431
_cell_angle_alpha   81.849
_cell_angle_beta   81.849
_cell_angle_gamma   81.849
_symmetry_Int_Tables_number   1
_cell_volume   258.660
_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  0.658  0.658  0.658  1.0
  Ce  Ce1  1  0.342  0.342  0.342  1.0
  Fe  Fe2  1  0.342  0.342  0.844  1.0
  Fe  Fe3  1  0.342  0.844  0.342  1.0
  Fe  Fe4  1  0.095  0.095  0.095  1.0
  Fe  Fe5  1  0.905  0.905  0.905  1.0
  Fe  Fe6  1  0.000  0.000  0.500  1.0
  Fe  Fe7  1  0.500  0.000  0.000  1.0
  Fe  Fe8  1  0.000  0.500  0.000  1.0
  Fe  Fe9  1  0.296  0.704  0.000  1.0
  Fe  Fe10  1  0.000  0.296  0.704  1.0
  Fe  Fe11  1  0.704  0.000  0.296  1.0
  Fe  Fe12  1  0.704  0.296  0.000  1.0
  Fe  Fe13  1  0.000  0.704  0.296  1.0
  Fe  Fe14  1  0.296  0.000  0.704  1.0
  Fe  Fe15  1  0.658  0.156  0.658  1.0
  Fe  Fe16  1  0.658  0.658  0.156  1.0
  Fe  Fe17  1  0.156  0.658  0.658  1.0
  Fe  Fe18  1  0.844  0.342  0.342  1.0
[/CIF]
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