The compound described by Ce2Co17 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 20-coordinate geometry to two equivalent Co(2), six equivalent Co(1), six equivalent Co(3), and six equivalent Co(4) atoms. In the second Ce site, Ce(2) is bonded in a 18-coordinate geometry to six equivalent Co(4) and twelve equivalent Co(1) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one Ce(1), two equivalent Ce(2), one Co(2), two equivalent Co(1), two equivalent Co(3), and four equivalent Co(4) atoms to form distorted CoCe3Co9 cuboctahedra that share corners with five equivalent Co(3)Ce2Co10 cuboctahedra, corners with eight equivalent Co(4)Ce2Co10 cuboctahedra, corners with ten equivalent Co(1)Ce3Co9 cuboctahedra, edges with two equivalent Co(4)Ce2Co10 cuboctahedra, edges with three equivalent Co(3)Ce2Co10 cuboctahedra, edges with five equivalent Co(1)Ce3Co9 cuboctahedra, faces with two equivalent Co(3)Ce2Co10 cuboctahedra, faces with eight equivalent Co(1)Ce3Co9 cuboctahedra, and faces with ten equivalent Co(4)Ce2Co10 cuboctahedra. In the second Co site, Co(2) is bonded in a 14-coordinate geometry to one Ce(1), one Co(2), three equivalent Co(1), three equivalent Co(3), and six equivalent Co(4) atoms. In the third Co site, Co(3) is bonded to two equivalent Ce(1), two equivalent Co(2), four equivalent Co(1), and four equivalent Co(4) atoms to form CoCe2Co10 cuboctahedra that share corners with four equivalent Co(3)Ce2Co10 cuboctahedra, corners with eight equivalent Co(4)Ce2Co10 cuboctahedra, corners with ten equivalent Co(1)Ce3Co9 cuboctahedra, edges with four equivalent Co(4)Ce2Co10 cuboctahedra, edges with six equivalent Co(1)Ce3Co9 cuboctahedra, faces with four equivalent Co(1)Ce3Co9 cuboctahedra, faces with six equivalent Co(3)Ce2Co10 cuboctahedra, and faces with eight equivalent Co(4)Ce2Co10 cuboctahedra. In the fourth Co site, Co(4) is bonded to one Ce(1), one Ce(2), two equivalent Co(2), two equivalent Co(3), two equivalent Co(4), and four equivalent Co(1) atoms to form distorted CoCe2Co10 cuboctahedra that share corners with four equivalent Co(3)Ce2Co10 cuboctahedra, corners with eight equivalent Co(1)Ce3Co9 cuboctahedra, corners with twelve equivalent Co(4)Ce2Co10 cuboctahedra,  an edgeedge with one Co(4)Ce2Co10 cuboctahedra, edges with two equivalent Co(3)Ce2Co10 cuboctahedra, edges with two equivalent Co(1)Ce3Co9 cuboctahedra, faces with four equivalent Co(3)Ce2Co10 cuboctahedra, faces with seven equivalent Co(4)Ce2Co10 cuboctahedra, and faces with ten equivalent Co(1)Ce3Co9 cuboctahedra. is represented by the CIF file [CIF]
data_Ce2Co17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.325
_cell_length_b   8.325
_cell_length_c   8.095
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   485.872
_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
  Ce  Ce0  1  0.667  0.333  0.250  1.0
  Ce  Ce1  1  0.333  0.667  0.750  1.0
  Ce  Ce2  1  0.000  0.000  0.750  1.0
  Ce  Ce3  1  0.000  0.000  0.250  1.0
  Co  Co4  1  0.167  0.335  0.523  1.0
  Co  Co5  1  0.665  0.833  0.523  1.0
  Co  Co6  1  0.167  0.833  0.523  1.0
  Co  Co7  1  0.833  0.167  0.023  1.0
  Co  Co8  1  0.333  0.667  0.105  1.0
  Co  Co9  1  0.667  0.333  0.605  1.0
  Co  Co10  1  0.667  0.333  0.895  1.0
  Co  Co11  1  0.333  0.667  0.395  1.0
  Co  Co12  1  0.500  0.000  0.000  1.0
  Co  Co13  1  0.500  0.500  0.500  1.0
  Co  Co14  1  0.000  0.500  0.500  1.0
  Co  Co15  1  0.000  0.500  0.000  1.0
  Co  Co16  1  0.500  0.500  0.000  1.0
  Co  Co17  1  0.500  0.000  0.500  1.0
  Co  Co18  1  0.328  0.952  0.250  1.0
  Co  Co19  1  0.376  0.328  0.750  1.0
  Co  Co20  1  0.952  0.624  0.750  1.0
  Co  Co21  1  0.048  0.376  0.250  1.0
  Co  Co22  1  0.624  0.672  0.250  1.0
  Co  Co23  1  0.376  0.048  0.750  1.0
  Co  Co24  1  0.672  0.624  0.750  1.0
  Co  Co25  1  0.672  0.048  0.750  1.0
  Co  Co26  1  0.952  0.328  0.750  1.0
  Co  Co27  1  0.048  0.672  0.250  1.0
  Co  Co28  1  0.624  0.952  0.250  1.0
  Co  Co29  1  0.328  0.376  0.250  1.0
  Co  Co30  1  0.167  0.833  0.977  1.0
  Co  Co31  1  0.335  0.167  0.477  1.0
  Co  Co32  1  0.833  0.665  0.477  1.0
  Co  Co33  1  0.167  0.335  0.977  1.0
  Co  Co34  1  0.665  0.833  0.977  1.0
  Co  Co35  1  0.335  0.167  0.023  1.0
  Co  Co36  1  0.833  0.665  0.023  1.0
  Co  Co37  1  0.833  0.167  0.477  1.0
[/CIF]
.
The compound described by Ce2Co17 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 20-coordinate geometry to two equivalent Co(2), six equivalent Co(1), six equivalent Co(3), and six equivalent Co(4) atoms. In the second Ce site, Ce(2) is bonded in a 18-coordinate geometry to six equivalent Co(4) and twelve equivalent Co(1) atoms. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one Ce(1), two equivalent Ce(2), one Co(2), two equivalent Co(1), two equivalent Co(3), and four equivalent Co(4) atoms to form distorted CoCe3Co9 cuboctahedra that share corners with five equivalent Co(3)Ce2Co10 cuboctahedra, corners with eight equivalent Co(4)Ce2Co10 cuboctahedra, corners with ten equivalent Co(1)Ce3Co9 cuboctahedra, edges with two equivalent Co(4)Ce2Co10 cuboctahedra, edges with three equivalent Co(3)Ce2Co10 cuboctahedra, edges with five equivalent Co(1)Ce3Co9 cuboctahedra, faces with two equivalent Co(3)Ce2Co10 cuboctahedra, faces with eight equivalent Co(1)Ce3Co9 cuboctahedra, and faces with ten equivalent Co(4)Ce2Co10 cuboctahedra. In the second Co site, Co(2) is bonded in a 14-coordinate geometry to one Ce(1), one Co(2), three equivalent Co(1), three equivalent Co(3), and six equivalent Co(4) atoms. In the third Co site, Co(3) is bonded to two equivalent Ce(1), two equivalent Co(2), four equivalent Co(1), and four equivalent Co(4) atoms to form CoCe2Co10 cuboctahedra that share corners with four equivalent Co(3)Ce2Co10 cuboctahedra, corners with eight equivalent Co(4)Ce2Co10 cuboctahedra, corners with ten equivalent Co(1)Ce3Co9 cuboctahedra, edges with four equivalent Co(4)Ce2Co10 cuboctahedra, edges with six equivalent Co(1)Ce3Co9 cuboctahedra, faces with four equivalent Co(1)Ce3Co9 cuboctahedra, faces with six equivalent Co(3)Ce2Co10 cuboctahedra, and faces with eight equivalent Co(4)Ce2Co10 cuboctahedra. In the fourth Co site, Co(4) is bonded to one Ce(1), one Ce(2), two equivalent Co(2), two equivalent Co(3), two equivalent Co(4), and four equivalent Co(1) atoms to form distorted CoCe2Co10 cuboctahedra that share corners with four equivalent Co(3)Ce2Co10 cuboctahedra, corners with eight equivalent Co(1)Ce3Co9 cuboctahedra, corners with twelve equivalent Co(4)Ce2Co10 cuboctahedra,  an edgeedge with one Co(4)Ce2Co10 cuboctahedra, edges with two equivalent Co(3)Ce2Co10 cuboctahedra, edges with two equivalent Co(1)Ce3Co9 cuboctahedra, faces with four equivalent Co(3)Ce2Co10 cuboctahedra, faces with seven equivalent Co(4)Ce2Co10 cuboctahedra, and faces with ten equivalent Co(1)Ce3Co9 cuboctahedra. is represented by the CIF file [CIF]
data_Ce2Co17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.325
_cell_length_b   8.325
_cell_length_c   8.095
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   485.872
_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
  Ce  Ce0  1  0.667  0.333  0.250  1.0
  Ce  Ce1  1  0.333  0.667  0.750  1.0
  Ce  Ce2  1  0.000  0.000  0.750  1.0
  Ce  Ce3  1  0.000  0.000  0.250  1.0
  Co  Co4  1  0.167  0.335  0.523  1.0
  Co  Co5  1  0.665  0.833  0.523  1.0
  Co  Co6  1  0.167  0.833  0.523  1.0
  Co  Co7  1  0.833  0.167  0.023  1.0
  Co  Co8  1  0.333  0.667  0.105  1.0
  Co  Co9  1  0.667  0.333  0.605  1.0
  Co  Co10  1  0.667  0.333  0.895  1.0
  Co  Co11  1  0.333  0.667  0.395  1.0
  Co  Co12  1  0.500  0.000  0.000  1.0
  Co  Co13  1  0.500  0.500  0.500  1.0
  Co  Co14  1  0.000  0.500  0.500  1.0
  Co  Co15  1  0.000  0.500  0.000  1.0
  Co  Co16  1  0.500  0.500  0.000  1.0
  Co  Co17  1  0.500  0.000  0.500  1.0
  Co  Co18  1  0.328  0.952  0.250  1.0
  Co  Co19  1  0.376  0.328  0.750  1.0
  Co  Co20  1  0.952  0.624  0.750  1.0
  Co  Co21  1  0.048  0.376  0.250  1.0
  Co  Co22  1  0.624  0.672  0.250  1.0
  Co  Co23  1  0.376  0.048  0.750  1.0
  Co  Co24  1  0.672  0.624  0.750  1.0
  Co  Co25  1  0.672  0.048  0.750  1.0
  Co  Co26  1  0.952  0.328  0.750  1.0
  Co  Co27  1  0.048  0.672  0.250  1.0
  Co  Co28  1  0.624  0.952  0.250  1.0
  Co  Co29  1  0.328  0.376  0.250  1.0
  Co  Co30  1  0.167  0.833  0.977  1.0
  Co  Co31  1  0.335  0.167  0.477  1.0
  Co  Co32  1  0.833  0.665  0.477  1.0
  Co  Co33  1  0.167  0.335  0.977  1.0
  Co  Co34  1  0.665  0.833  0.977  1.0
  Co  Co35  1  0.335  0.167  0.023  1.0
  Co  Co36  1  0.833  0.665  0.023  1.0
  Co  Co37  1  0.833  0.167  0.477  1.0
[/CIF]
.