The crystal structure described by Y2Ni17 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 18-coordinate geometry to six equivalent Ni(3) and twelve equivalent Ni(4) atoms. In the second Y site, Y(2) is bonded in a 20-coordinate geometry to two equivalent Ni(1), six equivalent Ni(2), six equivalent Ni(3), and six equivalent Ni(4) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 14-coordinate geometry to one Y(2), one Ni(1), three equivalent Ni(2), three equivalent Ni(4), and six equivalent Ni(3) atoms. In the second Ni site, Ni(2) is bonded to two equivalent Y(2), two equivalent Ni(1), four equivalent Ni(3), and four equivalent Ni(4) atoms to form NiY2Ni10 cuboctahedra that share corners with four equivalent Ni(2)Y2Ni10 cuboctahedra, corners with ten equivalent Ni(4)Y3Ni9 cuboctahedra, edges with six equivalent Ni(4)Y3Ni9 cuboctahedra, faces with four equivalent Ni(4)Y3Ni9 cuboctahedra, and faces with six equivalent Ni(2)Y2Ni10 cuboctahedra. In the third Ni site, Ni(3) is bonded in a 12-coordinate geometry to one Y(1), one Y(2), two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), and four equivalent Ni(4) atoms. In the fourth Ni site, Ni(4) is bonded to one Y(2), two equivalent Y(1), one Ni(1), two equivalent Ni(2), two equivalent Ni(4), and four equivalent Ni(3) atoms to form distorted NiY3Ni9 cuboctahedra that share corners with five equivalent Ni(2)Y2Ni10 cuboctahedra, corners with ten equivalent Ni(4)Y3Ni9 cuboctahedra, edges with three equivalent Ni(2)Y2Ni10 cuboctahedra, edges with five equivalent Ni(4)Y3Ni9 cuboctahedra, faces with two equivalent Ni(2)Y2Ni10 cuboctahedra, and faces with eight equivalent Ni(4)Y3Ni9 cuboctahedra. is represented by the CIF card [CIF]
data_Y2Ni17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.252
_cell_length_b   8.252
_cell_length_c   8.016
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   472.772
_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
  Y  Y0  1  0.000  0.000  0.250  1.0
  Y  Y1  1  0.000  0.000  0.750  1.0
  Y  Y2  1  0.333  0.667  0.750  1.0
  Y  Y3  1  0.667  0.333  0.250  1.0
  Ni  Ni4  1  0.333  0.667  0.397  1.0
  Ni  Ni5  1  0.667  0.333  0.603  1.0
  Ni  Ni6  1  0.667  0.333  0.897  1.0
  Ni  Ni7  1  0.333  0.667  0.103  1.0
  Ni  Ni8  1  0.500  0.500  0.500  1.0
  Ni  Ni9  1  0.500  0.000  0.500  1.0
  Ni  Ni10  1  0.000  0.500  0.500  1.0
  Ni  Ni11  1  0.500  0.500  0.000  1.0
  Ni  Ni12  1  0.500  0.000  0.000  1.0
  Ni  Ni13  1  0.000  0.500  0.000  1.0
  Ni  Ni14  1  0.328  0.372  0.250  1.0
  Ni  Ni15  1  0.628  0.956  0.250  1.0
  Ni  Ni16  1  0.044  0.672  0.250  1.0
  Ni  Ni17  1  0.628  0.672  0.250  1.0
  Ni  Ni18  1  0.044  0.372  0.250  1.0
  Ni  Ni19  1  0.328  0.956  0.250  1.0
  Ni  Ni20  1  0.672  0.628  0.750  1.0
  Ni  Ni21  1  0.372  0.044  0.750  1.0
  Ni  Ni22  1  0.956  0.328  0.750  1.0
  Ni  Ni23  1  0.372  0.328  0.750  1.0
  Ni  Ni24  1  0.956  0.628  0.750  1.0
  Ni  Ni25  1  0.672  0.044  0.750  1.0
  Ni  Ni26  1  0.165  0.835  0.522  1.0
  Ni  Ni27  1  0.165  0.330  0.522  1.0
  Ni  Ni28  1  0.670  0.835  0.522  1.0
  Ni  Ni29  1  0.835  0.165  0.478  1.0
  Ni  Ni30  1  0.835  0.670  0.478  1.0
  Ni  Ni31  1  0.330  0.165  0.478  1.0
  Ni  Ni32  1  0.835  0.165  0.022  1.0
  Ni  Ni33  1  0.835  0.670  0.022  1.0
  Ni  Ni34  1  0.330  0.165  0.022  1.0
  Ni  Ni35  1  0.165  0.835  0.978  1.0
  Ni  Ni36  1  0.165  0.330  0.978  1.0
  Ni  Ni37  1  0.670  0.835  0.978  1.0
[/CIF]
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The crystal structure described by Y2Ni17 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 18-coordinate geometry to six equivalent Ni(3) and twelve equivalent Ni(4) atoms. In the second Y site, Y(2) is bonded in a 20-coordinate geometry to two equivalent Ni(1), six equivalent Ni(2), six equivalent Ni(3), and six equivalent Ni(4) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 14-coordinate geometry to one Y(2), one Ni(1), three equivalent Ni(2), three equivalent Ni(4), and six equivalent Ni(3) atoms. In the second Ni site, Ni(2) is bonded to two equivalent Y(2), two equivalent Ni(1), four equivalent Ni(3), and four equivalent Ni(4) atoms to form NiY2Ni10 cuboctahedra that share corners with four equivalent Ni(2)Y2Ni10 cuboctahedra, corners with ten equivalent Ni(4)Y3Ni9 cuboctahedra, edges with six equivalent Ni(4)Y3Ni9 cuboctahedra, faces with four equivalent Ni(4)Y3Ni9 cuboctahedra, and faces with six equivalent Ni(2)Y2Ni10 cuboctahedra. In the third Ni site, Ni(3) is bonded in a 12-coordinate geometry to one Y(1), one Y(2), two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), and four equivalent Ni(4) atoms. In the fourth Ni site, Ni(4) is bonded to one Y(2), two equivalent Y(1), one Ni(1), two equivalent Ni(2), two equivalent Ni(4), and four equivalent Ni(3) atoms to form distorted NiY3Ni9 cuboctahedra that share corners with five equivalent Ni(2)Y2Ni10 cuboctahedra, corners with ten equivalent Ni(4)Y3Ni9 cuboctahedra, edges with three equivalent Ni(2)Y2Ni10 cuboctahedra, edges with five equivalent Ni(4)Y3Ni9 cuboctahedra, faces with two equivalent Ni(2)Y2Ni10 cuboctahedra, and faces with eight equivalent Ni(4)Y3Ni9 cuboctahedra. is represented by the CIF card [CIF]
data_Y2Ni17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.252
_cell_length_b   8.252
_cell_length_c   8.016
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   472.772
_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
  Y  Y0  1  0.000  0.000  0.250  1.0
  Y  Y1  1  0.000  0.000  0.750  1.0
  Y  Y2  1  0.333  0.667  0.750  1.0
  Y  Y3  1  0.667  0.333  0.250  1.0
  Ni  Ni4  1  0.333  0.667  0.397  1.0
  Ni  Ni5  1  0.667  0.333  0.603  1.0
  Ni  Ni6  1  0.667  0.333  0.897  1.0
  Ni  Ni7  1  0.333  0.667  0.103  1.0
  Ni  Ni8  1  0.500  0.500  0.500  1.0
  Ni  Ni9  1  0.500  0.000  0.500  1.0
  Ni  Ni10  1  0.000  0.500  0.500  1.0
  Ni  Ni11  1  0.500  0.500  0.000  1.0
  Ni  Ni12  1  0.500  0.000  0.000  1.0
  Ni  Ni13  1  0.000  0.500  0.000  1.0
  Ni  Ni14  1  0.328  0.372  0.250  1.0
  Ni  Ni15  1  0.628  0.956  0.250  1.0
  Ni  Ni16  1  0.044  0.672  0.250  1.0
  Ni  Ni17  1  0.628  0.672  0.250  1.0
  Ni  Ni18  1  0.044  0.372  0.250  1.0
  Ni  Ni19  1  0.328  0.956  0.250  1.0
  Ni  Ni20  1  0.672  0.628  0.750  1.0
  Ni  Ni21  1  0.372  0.044  0.750  1.0
  Ni  Ni22  1  0.956  0.328  0.750  1.0
  Ni  Ni23  1  0.372  0.328  0.750  1.0
  Ni  Ni24  1  0.956  0.628  0.750  1.0
  Ni  Ni25  1  0.672  0.044  0.750  1.0
  Ni  Ni26  1  0.165  0.835  0.522  1.0
  Ni  Ni27  1  0.165  0.330  0.522  1.0
  Ni  Ni28  1  0.670  0.835  0.522  1.0
  Ni  Ni29  1  0.835  0.165  0.478  1.0
  Ni  Ni30  1  0.835  0.670  0.478  1.0
  Ni  Ni31  1  0.330  0.165  0.478  1.0
  Ni  Ni32  1  0.835  0.165  0.022  1.0
  Ni  Ni33  1  0.835  0.670  0.022  1.0
  Ni  Ni34  1  0.330  0.165  0.022  1.0
  Ni  Ni35  1  0.165  0.835  0.978  1.0
  Ni  Ni36  1  0.165  0.330  0.978  1.0
  Ni  Ni37  1  0.670  0.835  0.978  1.0
[/CIF]
.