The material described by Ni25Si9 crystallizes in the trigonal P-3 space group. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 13-coordinate geometry to one Ni(3), one Ni(5), three equivalent Ni(1), four equivalent Ni(6), one Si(1), one Si(3), and two equivalent Si(2) atoms. In the second Ni site, Ni(2) is bonded in a 12-coordinate geometry to three equivalent Ni(6), six equivalent Ni(7), and three equivalent Si(1) atoms. In the third Ni site, Ni(3) is bonded in a 8-coordinate geometry to one Ni(4), three equivalent Ni(1), three equivalent Ni(6), one Si(3), and three equivalent Si(1) atoms. In the fourth Ni site, Ni(4) is bonded in a distorted body-centered cubic geometry to two equivalent Ni(3) and six equivalent Ni(7) atoms. In the fifth Ni site, Ni(5) is bonded in a 13-coordinate geometry to three equivalent Ni(1), three equivalent Ni(6), three equivalent Ni(7), one Si(2), and three equivalent Si(1) atoms. In the sixth Ni site, Ni(6) is bonded in a 11-coordinate geometry to one Ni(2), one Ni(3), one Ni(5), one Ni(7), four equivalent Ni(1), one Si(2), and two equivalent Si(1) atoms. In the seventh Ni site, Ni(7) is bonded in a 12-coordinate geometry to one Ni(4), one Ni(5), one Ni(6), two equivalent Ni(2), three equivalent Ni(7), and four equivalent Si(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one Ni(1), one Ni(2), one Ni(3), one Ni(5), two equivalent Ni(6), and four equivalent Ni(7) atoms. In the second Si site, Si(2) is bonded in a 10-coordinate geometry to one Ni(5), three equivalent Ni(6), and six equivalent Ni(1) atoms. In the third Si site, Si(3) is bonded in a body-centered cubic geometry to two equivalent Ni(3) and six equivalent Ni(1) atoms. is represented by the CIF card [CIF]
data_Si9Ni25
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.622
_cell_length_b   6.622
_cell_length_c   9.520
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   361.543
_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
  Si  Si0  1  0.992  0.329  0.677  1.0
  Si  Si1  1  0.008  0.671  0.323  1.0
  Si  Si2  1  0.337  0.008  0.677  1.0
  Si  Si3  1  0.663  0.992  0.323  1.0
  Si  Si4  1  0.671  0.663  0.677  1.0
  Si  Si5  1  0.329  0.337  0.323  1.0
  Si  Si6  1  0.667  0.333  0.975  1.0
  Si  Si7  1  0.333  0.667  0.025  1.0
  Si  Si8  1  0.000  0.000  0.000  1.0
  Ni  Ni9  1  0.657  0.702  0.925  1.0
  Ni  Ni10  1  0.343  0.298  0.075  1.0
  Ni  Ni11  1  0.045  0.343  0.925  1.0
  Ni  Ni12  1  0.955  0.657  0.075  1.0
  Ni  Ni13  1  0.298  0.955  0.925  1.0
  Ni  Ni14  1  0.702  0.045  0.075  1.0
  Ni  Ni15  1  0.667  0.333  0.610  1.0
  Ni  Ni16  1  0.333  0.667  0.390  1.0
  Ni  Ni17  1  0.000  0.000  0.756  1.0
  Ni  Ni18  1  0.000  0.000  0.244  1.0
  Ni  Ni19  1  0.000  0.000  0.500  1.0
  Ni  Ni20  1  0.667  0.333  0.237  1.0
  Ni  Ni21  1  0.333  0.667  0.763  1.0
  Ni  Ni22  1  0.672  0.072  0.812  1.0
  Ni  Ni23  1  0.328  0.928  0.188  1.0
  Ni  Ni24  1  0.400  0.328  0.812  1.0
  Ni  Ni25  1  0.600  0.672  0.188  1.0
  Ni  Ni26  1  0.928  0.600  0.812  1.0
  Ni  Ni27  1  0.072  0.400  0.188  1.0
  Ni  Ni28  1  0.622  0.936  0.567  1.0
  Ni  Ni29  1  0.378  0.064  0.433  1.0
  Ni  Ni30  1  0.314  0.378  0.567  1.0
  Ni  Ni31  1  0.686  0.622  0.433  1.0
  Ni  Ni32  1  0.064  0.686  0.567  1.0
  Ni  Ni33  1  0.936  0.314  0.433  1.0
[/CIF]
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The material described by Ni25Si9 crystallizes in the trigonal P-3 space group. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 13-coordinate geometry to one Ni(3), one Ni(5), three equivalent Ni(1), four equivalent Ni(6), one Si(1), one Si(3), and two equivalent Si(2) atoms. In the second Ni site, Ni(2) is bonded in a 12-coordinate geometry to three equivalent Ni(6), six equivalent Ni(7), and three equivalent Si(1) atoms. In the third Ni site, Ni(3) is bonded in a 8-coordinate geometry to one Ni(4), three equivalent Ni(1), three equivalent Ni(6), one Si(3), and three equivalent Si(1) atoms. In the fourth Ni site, Ni(4) is bonded in a distorted body-centered cubic geometry to two equivalent Ni(3) and six equivalent Ni(7) atoms. In the fifth Ni site, Ni(5) is bonded in a 13-coordinate geometry to three equivalent Ni(1), three equivalent Ni(6), three equivalent Ni(7), one Si(2), and three equivalent Si(1) atoms. In the sixth Ni site, Ni(6) is bonded in a 11-coordinate geometry to one Ni(2), one Ni(3), one Ni(5), one Ni(7), four equivalent Ni(1), one Si(2), and two equivalent Si(1) atoms. In the seventh Ni site, Ni(7) is bonded in a 12-coordinate geometry to one Ni(4), one Ni(5), one Ni(6), two equivalent Ni(2), three equivalent Ni(7), and four equivalent Si(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one Ni(1), one Ni(2), one Ni(3), one Ni(5), two equivalent Ni(6), and four equivalent Ni(7) atoms. In the second Si site, Si(2) is bonded in a 10-coordinate geometry to one Ni(5), three equivalent Ni(6), and six equivalent Ni(1) atoms. In the third Si site, Si(3) is bonded in a body-centered cubic geometry to two equivalent Ni(3) and six equivalent Ni(1) atoms. is represented by the CIF card [CIF]
data_Si9Ni25
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.622
_cell_length_b   6.622
_cell_length_c   9.520
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   361.543
_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
  Si  Si0  1  0.992  0.329  0.677  1.0
  Si  Si1  1  0.008  0.671  0.323  1.0
  Si  Si2  1  0.337  0.008  0.677  1.0
  Si  Si3  1  0.663  0.992  0.323  1.0
  Si  Si4  1  0.671  0.663  0.677  1.0
  Si  Si5  1  0.329  0.337  0.323  1.0
  Si  Si6  1  0.667  0.333  0.975  1.0
  Si  Si7  1  0.333  0.667  0.025  1.0
  Si  Si8  1  0.000  0.000  0.000  1.0
  Ni  Ni9  1  0.657  0.702  0.925  1.0
  Ni  Ni10  1  0.343  0.298  0.075  1.0
  Ni  Ni11  1  0.045  0.343  0.925  1.0
  Ni  Ni12  1  0.955  0.657  0.075  1.0
  Ni  Ni13  1  0.298  0.955  0.925  1.0
  Ni  Ni14  1  0.702  0.045  0.075  1.0
  Ni  Ni15  1  0.667  0.333  0.610  1.0
  Ni  Ni16  1  0.333  0.667  0.390  1.0
  Ni  Ni17  1  0.000  0.000  0.756  1.0
  Ni  Ni18  1  0.000  0.000  0.244  1.0
  Ni  Ni19  1  0.000  0.000  0.500  1.0
  Ni  Ni20  1  0.667  0.333  0.237  1.0
  Ni  Ni21  1  0.333  0.667  0.763  1.0
  Ni  Ni22  1  0.672  0.072  0.812  1.0
  Ni  Ni23  1  0.328  0.928  0.188  1.0
  Ni  Ni24  1  0.400  0.328  0.812  1.0
  Ni  Ni25  1  0.600  0.672  0.188  1.0
  Ni  Ni26  1  0.928  0.600  0.812  1.0
  Ni  Ni27  1  0.072  0.400  0.188  1.0
  Ni  Ni28  1  0.622  0.936  0.567  1.0
  Ni  Ni29  1  0.378  0.064  0.433  1.0
  Ni  Ni30  1  0.314  0.378  0.567  1.0
  Ni  Ni31  1  0.686  0.622  0.433  1.0
  Ni  Ni32  1  0.064  0.686  0.567  1.0
  Ni  Ni33  1  0.936  0.314  0.433  1.0
[/CIF]
.