The crystal structure described by Ce2Ni17Si5 crystallizes in the tetragonal I-4m2 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 18-coordinate geometry to eight equivalent Ni(1), eight equivalent Ni(2), and two equivalent Si(2) atoms. In the second Ce site, Ce(2) is bonded in a 22-coordinate geometry to two equivalent Ni(3), eight equivalent Ni(1), eight equivalent Ni(2), and four equivalent Si(1) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 12-coordinate geometry to one Ce(1), one Ce(2), one Ni(3), three equivalent Ni(1), four equivalent Ni(2), and two equivalent Si(1) atoms. In the second Ni site, Ni(2) is bonded to one Ce(1), one Ce(2), three equivalent Ni(2), four equivalent Ni(1), one Si(2), and two equivalent Si(1) atoms to form a mixture of distorted edge, face, and corner-sharing NiCe2Si3Ni7 cuboctahedra. In the third Ni site, Ni(3) is bonded in a 14-coordinate geometry to two equivalent Ce(2), eight equivalent Ni(1), and four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one Ce(2), one Ni(3), four equivalent Ni(1), four equivalent Ni(2), and one Si(2) atom. In the second Si site, Si(2) is bonded in a 14-coordinate geometry to two equivalent Ce(1), eight equivalent Ni(2), and four equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Si5Ni17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.609
_cell_length_b   7.609
_cell_length_c   7.609
_cell_angle_alpha   99.534
_cell_angle_beta   99.534
_cell_angle_gamma   131.968
_symmetry_Int_Tables_number   1
_cell_volume   299.163
_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  0.000  0.000  0.000  1.0
  Ce  Ce1  1  0.250  0.750  0.500  1.0
  Si  Si2  1  0.628  0.893  0.265  1.0
  Si  Si3  1  0.637  0.372  0.265  1.0
  Si  Si4  1  0.107  0.372  0.735  1.0
  Si  Si5  1  0.628  0.363  0.735  1.0
  Si  Si6  1  0.500  0.500  0.000  1.0
  Ni  Ni7  1  0.819  0.239  0.171  1.0
  Ni  Ni8  1  0.068  0.239  0.420  1.0
  Ni  Ni9  1  0.879  0.806  0.319  1.0
  Ni  Ni10  1  0.487  0.806  0.927  1.0
  Ni  Ni11  1  0.819  0.648  0.580  1.0
  Ni  Ni12  1  0.068  0.648  0.829  1.0
  Ni  Ni13  1  0.879  0.560  0.073  1.0
  Ni  Ni14  1  0.487  0.560  0.681  1.0
  Ni  Ni15  1  0.440  0.513  0.319  1.0
  Ni  Ni16  1  0.194  0.513  0.073  1.0
  Ni  Ni17  1  0.352  0.932  0.171  1.0
  Ni  Ni18  1  0.761  0.932  0.580  1.0
  Ni  Ni19  1  0.440  0.121  0.927  1.0
  Ni  Ni20  1  0.194  0.121  0.681  1.0
  Ni  Ni21  1  0.352  0.181  0.420  1.0
  Ni  Ni22  1  0.761  0.181  0.829  1.0
  Ni  Ni23  1  0.750  0.250  0.500  1.0
[/CIF]
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The crystal structure described by Ce2Ni17Si5 crystallizes in the tetragonal I-4m2 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 18-coordinate geometry to eight equivalent Ni(1), eight equivalent Ni(2), and two equivalent Si(2) atoms. In the second Ce site, Ce(2) is bonded in a 22-coordinate geometry to two equivalent Ni(3), eight equivalent Ni(1), eight equivalent Ni(2), and four equivalent Si(1) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 12-coordinate geometry to one Ce(1), one Ce(2), one Ni(3), three equivalent Ni(1), four equivalent Ni(2), and two equivalent Si(1) atoms. In the second Ni site, Ni(2) is bonded to one Ce(1), one Ce(2), three equivalent Ni(2), four equivalent Ni(1), one Si(2), and two equivalent Si(1) atoms to form a mixture of distorted edge, face, and corner-sharing NiCe2Si3Ni7 cuboctahedra. In the third Ni site, Ni(3) is bonded in a 14-coordinate geometry to two equivalent Ce(2), eight equivalent Ni(1), and four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one Ce(2), one Ni(3), four equivalent Ni(1), four equivalent Ni(2), and one Si(2) atom. In the second Si site, Si(2) is bonded in a 14-coordinate geometry to two equivalent Ce(1), eight equivalent Ni(2), and four equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Si5Ni17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.609
_cell_length_b   7.609
_cell_length_c   7.609
_cell_angle_alpha   99.534
_cell_angle_beta   99.534
_cell_angle_gamma   131.968
_symmetry_Int_Tables_number   1
_cell_volume   299.163
_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  0.000  0.000  0.000  1.0
  Ce  Ce1  1  0.250  0.750  0.500  1.0
  Si  Si2  1  0.628  0.893  0.265  1.0
  Si  Si3  1  0.637  0.372  0.265  1.0
  Si  Si4  1  0.107  0.372  0.735  1.0
  Si  Si5  1  0.628  0.363  0.735  1.0
  Si  Si6  1  0.500  0.500  0.000  1.0
  Ni  Ni7  1  0.819  0.239  0.171  1.0
  Ni  Ni8  1  0.068  0.239  0.420  1.0
  Ni  Ni9  1  0.879  0.806  0.319  1.0
  Ni  Ni10  1  0.487  0.806  0.927  1.0
  Ni  Ni11  1  0.819  0.648  0.580  1.0
  Ni  Ni12  1  0.068  0.648  0.829  1.0
  Ni  Ni13  1  0.879  0.560  0.073  1.0
  Ni  Ni14  1  0.487  0.560  0.681  1.0
  Ni  Ni15  1  0.440  0.513  0.319  1.0
  Ni  Ni16  1  0.194  0.513  0.073  1.0
  Ni  Ni17  1  0.352  0.932  0.171  1.0
  Ni  Ni18  1  0.761  0.932  0.580  1.0
  Ni  Ni19  1  0.440  0.121  0.927  1.0
  Ni  Ni20  1  0.194  0.121  0.681  1.0
  Ni  Ni21  1  0.352  0.181  0.420  1.0
  Ni  Ni22  1  0.761  0.181  0.829  1.0
  Ni  Ni23  1  0.750  0.250  0.500  1.0
[/CIF]
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