The material structure described by Ni16AlSi9 is beta Plutonium-derived structured and crystallizes in the orthorhombic Ama2 space group. There are eleven inequivalent Ni sites. In the first Ni site, Ni(8) is bonded in a 12-coordinate geometry to one Ni(4), one Ni(9), two equivalent Ni(2), two equivalent Ni(6), one Al(1), one Si(5), two equivalent Si(2), and two equivalent Si(4) atoms. In the second Ni site, Ni(9) is bonded in a 13-coordinate geometry to one Ni(10), one Ni(11), one Ni(7), one Ni(8), two equivalent Ni(2), two equivalent Ni(3), one Si(5), two equivalent Si(2), and two equivalent Si(3) atoms. In the third Ni site, Ni(10) is bonded in a 1-coordinate geometry to one Ni(11), one Ni(9), two equivalent Ni(1), two equivalent Ni(3), one Al(1), two equivalent Si(2), and two equivalent Si(4) atoms. In the fourth Ni site, Ni(11) is bonded in a 11-coordinate geometry to one Ni(10), one Ni(4), one Ni(9), two equivalent Ni(3), one Al(1), one Si(5), two equivalent Si(1), and two equivalent Si(4) atoms. In the fifth Ni site, Ni(1) is bonded in a 13-coordinate geometry to one Ni(1), one Ni(10), one Ni(5), one Ni(7), two equivalent Ni(3), two equivalent Ni(6), one Al(1), one Si(2), one Si(3), and two equivalent Si(4) atoms. In the sixth Ni site, Ni(2) is bonded in a 13-coordinate geometry to one Ni(2), one Ni(6), one Ni(8), one Ni(9), two equivalent Ni(3), two equivalent Ni(5), one Si(2), one Si(4), one Si(5), and two equivalent Si(3) atoms. In the seventh Ni site, Ni(3) is bonded in a 15-coordinate geometry to one Ni(10), one Ni(11), one Ni(3), one Ni(5), one Ni(6), one Ni(9), two equivalent Ni(1), two equivalent Ni(2), one Si(1), one Si(3), one Si(4), and two equivalent Si(2) atoms. In the eighth Ni site, Ni(4) is bonded in a 13-coordinate geometry to one Ni(11), one Ni(7), one Ni(8), two equivalent Ni(5), two equivalent Ni(6), one Al(1), one Si(5), two equivalent Si(1), and two equivalent Si(2) atoms. In the ninth Ni site, Ni(5) is bonded in a 14-coordinate geometry to one Ni(1), one Ni(3), one Ni(4), one Ni(5), one Ni(6), one Ni(7), two equivalent Ni(2), one Si(2), one Si(3), one Si(4), one Si(5), and two equivalent Si(1) atoms. In the tenth Ni site, Ni(6) is bonded in a 14-coordinate geometry to one Ni(2), one Ni(3), one Ni(4), one Ni(5), one Ni(6), one Ni(8), two equivalent Ni(1), one Al(1), one Si(2), one Si(3), one Si(4), and two equivalent Si(1) atoms. In the eleventh Ni site, Ni(7) is bonded in a 4-coordinate geometry to one Ni(4), one Ni(9), two equivalent Ni(1), two equivalent Ni(5), one Al(1), one Si(5), two equivalent Si(2), and two equivalent Si(3) atoms. Al(1) is bonded in a 6-coordinate geometry to one Ni(10), one Ni(11), one Ni(4), one Ni(7), one Ni(8), two equivalent Ni(1), two equivalent Ni(6), and two equivalent Si(1) atoms. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to one Ni(11), one Ni(3), one Ni(4), two equivalent Ni(5), two equivalent Ni(6), and one Al(1) atom. In the second Si site, Si(2) is bonded to one Ni(1), one Ni(10), one Ni(2), one Ni(4), one Ni(5), one Ni(6), one Ni(7), one Ni(8), one Ni(9), two equivalent Ni(3), and one Si(2) atom to form a mixture of distorted edge and face-sharing SiSiNi11 cuboctahedra. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one Ni(1), one Ni(3), one Ni(5), one Ni(6), one Ni(7), one Ni(9), and two equivalent Ni(2) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to one Ni(10), one Ni(11), one Ni(2), one Ni(3), one Ni(5), one Ni(6), one Ni(8), and two equivalent Ni(1) atoms. In the fifth Si site, Si(5) is bonded in a 7-coordinate geometry to one Ni(11), one Ni(4), one Ni(7), one Ni(8), one Ni(9), two equivalent Ni(2), and two equivalent Ni(5) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_AlSi9Ni16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.080
_cell_length_b   7.080
_cell_length_c   12.078
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   105.685
_symmetry_Int_Tables_number   1
_cell_volume   582.927
_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
  Al  Al0  1  0.283  0.650  0.250  1.0
  Al  Al1  1  0.350  0.717  0.750  1.0
  Si  Si2  1  0.412  0.414  0.406  1.0
  Si  Si3  1  0.586  0.588  0.594  1.0
  Si  Si4  1  0.412  0.414  0.094  1.0
  Si  Si5  1  0.586  0.588  0.906  1.0
  Si  Si6  1  0.158  0.158  0.857  1.0
  Si  Si7  1  0.842  0.842  0.143  1.0
  Si  Si8  1  0.158  0.158  0.643  1.0
  Si  Si9  1  0.842  0.842  0.357  1.0
  Si  Si10  1  0.006  0.383  0.399  1.0
  Si  Si11  1  0.617  0.994  0.601  1.0
  Si  Si12  1  0.006  0.383  0.101  1.0
  Si  Si13  1  0.617  0.994  0.899  1.0
  Si  Si14  1  0.997  0.621  0.606  1.0
  Si  Si15  1  0.379  0.003  0.394  1.0
  Si  Si16  1  0.997  0.621  0.894  1.0
  Si  Si17  1  0.379  0.003  0.106  1.0
  Si  Si18  1  0.719  0.336  0.750  1.0
  Si  Si19  1  0.664  0.281  0.250  1.0
  Ni  Ni20  1  0.104  0.717  0.424  1.0
  Ni  Ni21  1  0.283  0.896  0.576  1.0
  Ni  Ni22  1  0.104  0.717  0.076  1.0
  Ni  Ni23  1  0.283  0.896  0.924  1.0
  Ni  Ni24  1  0.891  0.282  0.578  1.0
  Ni  Ni25  1  0.718  0.109  0.422  1.0
  Ni  Ni26  1  0.891  0.282  0.922  1.0
  Ni  Ni27  1  0.718  0.109  0.078  1.0
  Ni  Ni28  1  0.127  0.127  0.441  1.0
  Ni  Ni29  1  0.873  0.873  0.559  1.0
  Ni  Ni30  1  0.127  0.127  0.059  1.0
  Ni  Ni31  1  0.873  0.873  0.941  1.0
  Ni  Ni32  1  0.585  0.574  0.250  1.0
  Ni  Ni33  1  0.426  0.415  0.750  1.0
  Ni  Ni34  1  0.748  0.516  0.442  1.0
  Ni  Ni35  1  0.484  0.252  0.558  1.0
  Ni  Ni36  1  0.748  0.516  0.058  1.0
  Ni  Ni37  1  0.484  0.252  0.942  1.0
  Ni  Ni38  1  0.250  0.483  0.560  1.0
  Ni  Ni39  1  0.517  0.750  0.440  1.0
  Ni  Ni40  1  0.250  0.483  0.940  1.0
  Ni  Ni41  1  0.517  0.750  0.060  1.0
  Ni  Ni42  1  0.933  0.559  0.250  1.0
  Ni  Ni43  1  0.441  0.067  0.750  1.0
  Ni  Ni44  1  0.061  0.428  0.750  1.0
  Ni  Ni45  1  0.572  0.939  0.250  1.0
  Ni  Ni46  1  0.938  0.164  0.250  1.0
  Ni  Ni47  1  0.836  0.062  0.750  1.0
  Ni  Ni48  1  0.077  0.857  0.750  1.0
  Ni  Ni49  1  0.143  0.923  0.250  1.0
  Ni  Ni50  1  0.738  0.695  0.750  1.0
  Ni  Ni51  1  0.305  0.262  0.250  1.0
[/CIF]
.
The material structure described by Ni16AlSi9 is beta Plutonium-derived structured and crystallizes in the orthorhombic Ama2 space group. There are eleven inequivalent Ni sites. In the first Ni site, Ni(8) is bonded in a 12-coordinate geometry to one Ni(4), one Ni(9), two equivalent Ni(2), two equivalent Ni(6), one Al(1), one Si(5), two equivalent Si(2), and two equivalent Si(4) atoms. In the second Ni site, Ni(9) is bonded in a 13-coordinate geometry to one Ni(10), one Ni(11), one Ni(7), one Ni(8), two equivalent Ni(2), two equivalent Ni(3), one Si(5), two equivalent Si(2), and two equivalent Si(3) atoms. In the third Ni site, Ni(10) is bonded in a 1-coordinate geometry to one Ni(11), one Ni(9), two equivalent Ni(1), two equivalent Ni(3), one Al(1), two equivalent Si(2), and two equivalent Si(4) atoms. In the fourth Ni site, Ni(11) is bonded in a 11-coordinate geometry to one Ni(10), one Ni(4), one Ni(9), two equivalent Ni(3), one Al(1), one Si(5), two equivalent Si(1), and two equivalent Si(4) atoms. In the fifth Ni site, Ni(1) is bonded in a 13-coordinate geometry to one Ni(1), one Ni(10), one Ni(5), one Ni(7), two equivalent Ni(3), two equivalent Ni(6), one Al(1), one Si(2), one Si(3), and two equivalent Si(4) atoms. In the sixth Ni site, Ni(2) is bonded in a 13-coordinate geometry to one Ni(2), one Ni(6), one Ni(8), one Ni(9), two equivalent Ni(3), two equivalent Ni(5), one Si(2), one Si(4), one Si(5), and two equivalent Si(3) atoms. In the seventh Ni site, Ni(3) is bonded in a 15-coordinate geometry to one Ni(10), one Ni(11), one Ni(3), one Ni(5), one Ni(6), one Ni(9), two equivalent Ni(1), two equivalent Ni(2), one Si(1), one Si(3), one Si(4), and two equivalent Si(2) atoms. In the eighth Ni site, Ni(4) is bonded in a 13-coordinate geometry to one Ni(11), one Ni(7), one Ni(8), two equivalent Ni(5), two equivalent Ni(6), one Al(1), one Si(5), two equivalent Si(1), and two equivalent Si(2) atoms. In the ninth Ni site, Ni(5) is bonded in a 14-coordinate geometry to one Ni(1), one Ni(3), one Ni(4), one Ni(5), one Ni(6), one Ni(7), two equivalent Ni(2), one Si(2), one Si(3), one Si(4), one Si(5), and two equivalent Si(1) atoms. In the tenth Ni site, Ni(6) is bonded in a 14-coordinate geometry to one Ni(2), one Ni(3), one Ni(4), one Ni(5), one Ni(6), one Ni(8), two equivalent Ni(1), one Al(1), one Si(2), one Si(3), one Si(4), and two equivalent Si(1) atoms. In the eleventh Ni site, Ni(7) is bonded in a 4-coordinate geometry to one Ni(4), one Ni(9), two equivalent Ni(1), two equivalent Ni(5), one Al(1), one Si(5), two equivalent Si(2), and two equivalent Si(3) atoms. Al(1) is bonded in a 6-coordinate geometry to one Ni(10), one Ni(11), one Ni(4), one Ni(7), one Ni(8), two equivalent Ni(1), two equivalent Ni(6), and two equivalent Si(1) atoms. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a 8-coordinate geometry to one Ni(11), one Ni(3), one Ni(4), two equivalent Ni(5), two equivalent Ni(6), and one Al(1) atom. In the second Si site, Si(2) is bonded to one Ni(1), one Ni(10), one Ni(2), one Ni(4), one Ni(5), one Ni(6), one Ni(7), one Ni(8), one Ni(9), two equivalent Ni(3), and one Si(2) atom to form a mixture of distorted edge and face-sharing SiSiNi11 cuboctahedra. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one Ni(1), one Ni(3), one Ni(5), one Ni(6), one Ni(7), one Ni(9), and two equivalent Ni(2) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to one Ni(10), one Ni(11), one Ni(2), one Ni(3), one Ni(5), one Ni(6), one Ni(8), and two equivalent Ni(1) atoms. In the fifth Si site, Si(5) is bonded in a 7-coordinate geometry to one Ni(11), one Ni(4), one Ni(7), one Ni(8), one Ni(9), two equivalent Ni(2), and two equivalent Ni(5) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_AlSi9Ni16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.080
_cell_length_b   7.080
_cell_length_c   12.078
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   105.685
_symmetry_Int_Tables_number   1
_cell_volume   582.927
_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
  Al  Al0  1  0.283  0.650  0.250  1.0
  Al  Al1  1  0.350  0.717  0.750  1.0
  Si  Si2  1  0.412  0.414  0.406  1.0
  Si  Si3  1  0.586  0.588  0.594  1.0
  Si  Si4  1  0.412  0.414  0.094  1.0
  Si  Si5  1  0.586  0.588  0.906  1.0
  Si  Si6  1  0.158  0.158  0.857  1.0
  Si  Si7  1  0.842  0.842  0.143  1.0
  Si  Si8  1  0.158  0.158  0.643  1.0
  Si  Si9  1  0.842  0.842  0.357  1.0
  Si  Si10  1  0.006  0.383  0.399  1.0
  Si  Si11  1  0.617  0.994  0.601  1.0
  Si  Si12  1  0.006  0.383  0.101  1.0
  Si  Si13  1  0.617  0.994  0.899  1.0
  Si  Si14  1  0.997  0.621  0.606  1.0
  Si  Si15  1  0.379  0.003  0.394  1.0
  Si  Si16  1  0.997  0.621  0.894  1.0
  Si  Si17  1  0.379  0.003  0.106  1.0
  Si  Si18  1  0.719  0.336  0.750  1.0
  Si  Si19  1  0.664  0.281  0.250  1.0
  Ni  Ni20  1  0.104  0.717  0.424  1.0
  Ni  Ni21  1  0.283  0.896  0.576  1.0
  Ni  Ni22  1  0.104  0.717  0.076  1.0
  Ni  Ni23  1  0.283  0.896  0.924  1.0
  Ni  Ni24  1  0.891  0.282  0.578  1.0
  Ni  Ni25  1  0.718  0.109  0.422  1.0
  Ni  Ni26  1  0.891  0.282  0.922  1.0
  Ni  Ni27  1  0.718  0.109  0.078  1.0
  Ni  Ni28  1  0.127  0.127  0.441  1.0
  Ni  Ni29  1  0.873  0.873  0.559  1.0
  Ni  Ni30  1  0.127  0.127  0.059  1.0
  Ni  Ni31  1  0.873  0.873  0.941  1.0
  Ni  Ni32  1  0.585  0.574  0.250  1.0
  Ni  Ni33  1  0.426  0.415  0.750  1.0
  Ni  Ni34  1  0.748  0.516  0.442  1.0
  Ni  Ni35  1  0.484  0.252  0.558  1.0
  Ni  Ni36  1  0.748  0.516  0.058  1.0
  Ni  Ni37  1  0.484  0.252  0.942  1.0
  Ni  Ni38  1  0.250  0.483  0.560  1.0
  Ni  Ni39  1  0.517  0.750  0.440  1.0
  Ni  Ni40  1  0.250  0.483  0.940  1.0
  Ni  Ni41  1  0.517  0.750  0.060  1.0
  Ni  Ni42  1  0.933  0.559  0.250  1.0
  Ni  Ni43  1  0.441  0.067  0.750  1.0
  Ni  Ni44  1  0.061  0.428  0.750  1.0
  Ni  Ni45  1  0.572  0.939  0.250  1.0
  Ni  Ni46  1  0.938  0.164  0.250  1.0
  Ni  Ni47  1  0.836  0.062  0.750  1.0
  Ni  Ni48  1  0.077  0.857  0.750  1.0
  Ni  Ni49  1  0.143  0.923  0.250  1.0
  Ni  Ni50  1  0.738  0.695  0.750  1.0
  Ni  Ni51  1  0.305  0.262  0.250  1.0
[/CIF]
.