The compound described by Ni3Si2 is beta Plutonium-derived structured and crystallizes in the orthorhombic Cmcm space group. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Ni(2), four equivalent Ni(6), two equivalent Si(2), and four equivalent Si(4) atoms to form face-sharing NiSi6Ni6 cuboctahedra. In the second Ni site, Ni(2) is bonded in a 13-coordinate geometry to one Ni(1), one Ni(2), one Ni(3), two equivalent Ni(5), two equivalent Ni(6), one Si(1), one Si(2), two equivalent Si(3), and two equivalent Si(4) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent Ni(2), two equivalent Ni(4), one Si(1), one Si(2), and four equivalent Si(3) atoms. In the fourth Ni site, Ni(4) is bonded in a 10-coordinate geometry to one Ni(3), one Ni(5), two equivalent Ni(6), one Si(1), one Si(4), and four equivalent Si(3) atoms. In the fifth Ni site, Ni(5) is bonded in a 3-coordinate geometry to one Ni(4), two equivalent Ni(2), four equivalent Ni(6), one Si(4), and four equivalent Si(3) atoms. In the sixth Ni site, Ni(6) is bonded in a 12-coordinate geometry to one Ni(1), one Ni(2), one Ni(4), two equivalent Ni(5), two equivalent Ni(6), one Si(2), two equivalent Si(3), and two equivalent Si(4) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 5-coordinate geometry to one Ni(3), two equivalent Ni(2), and two equivalent Ni(4) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to one Ni(3), two equivalent Ni(1), two equivalent Ni(2), and four equivalent Ni(6) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one Ni(2), one Ni(3), two equivalent Ni(4), two equivalent Ni(5), and two equivalent Ni(6) atoms. In the fourth Si site, Si(4) is bonded in a 8-coordinate geometry to one Ni(4), one Ni(5), two equivalent Ni(1), two equivalent Ni(2), and four equivalent Ni(6) atoms. is represented by the CIF file [CIF]
data_Si2Ni3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.076
_cell_length_b   8.076
_cell_length_c   6.871
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   97.037
_symmetry_Int_Tables_number   1
_cell_volume   444.784
_cell_formula_units_Z   8
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  0.593  0.593  0.250  1.0
  Si  Si1  1  0.407  0.407  0.750  1.0
  Si  Si2  1  0.845  0.845  0.750  1.0
  Si  Si3  1  0.155  0.155  0.250  1.0
  Si  Si4  1  0.493  0.189  0.458  1.0
  Si  Si5  1  0.507  0.811  0.958  1.0
  Si  Si6  1  0.811  0.507  0.958  1.0
  Si  Si7  1  0.189  0.493  0.458  1.0
  Si  Si8  1  0.493  0.189  0.042  1.0
  Si  Si9  1  0.507  0.811  0.542  1.0
  Si  Si10  1  0.811  0.507  0.542  1.0
  Si  Si11  1  0.189  0.493  0.042  1.0
  Si  Si12  1  0.175  0.938  0.750  1.0
  Si  Si13  1  0.825  0.062  0.250  1.0
  Si  Si14  1  0.062  0.825  0.250  1.0
  Si  Si15  1  0.938  0.175  0.750  1.0
  Ni  Ni16  1  0.000  0.000  0.500  1.0
  Ni  Ni17  1  0.000  0.000  0.000  1.0
  Ni  Ni18  1  0.235  0.235  0.562  1.0
  Ni  Ni19  1  0.765  0.765  0.062  1.0
  Ni  Ni20  1  0.235  0.235  0.938  1.0
  Ni  Ni21  1  0.765  0.765  0.438  1.0
  Ni  Ni22  1  0.383  0.383  0.250  1.0
  Ni  Ni23  1  0.617  0.617  0.750  1.0
  Ni  Ni24  1  0.678  0.315  0.750  1.0
  Ni  Ni25  1  0.322  0.685  0.250  1.0
  Ni  Ni26  1  0.685  0.322  0.250  1.0
  Ni  Ni27  1  0.315  0.678  0.750  1.0
  Ni  Ni28  1  0.443  0.050  0.750  1.0
  Ni  Ni29  1  0.557  0.950  0.250  1.0
  Ni  Ni30  1  0.950  0.557  0.250  1.0
  Ni  Ni31  1  0.050  0.443  0.750  1.0
  Ni  Ni32  1  0.291  0.946  0.440  1.0
  Ni  Ni33  1  0.709  0.054  0.940  1.0
  Ni  Ni34  1  0.054  0.709  0.940  1.0
  Ni  Ni35  1  0.946  0.291  0.440  1.0
  Ni  Ni36  1  0.291  0.946  0.060  1.0
  Ni  Ni37  1  0.709  0.054  0.560  1.0
  Ni  Ni38  1  0.054  0.709  0.560  1.0
  Ni  Ni39  1  0.946  0.291  0.060  1.0
[/CIF]
.
The compound described by Ni3Si2 is beta Plutonium-derived structured and crystallizes in the orthorhombic Cmcm space group. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Ni(2), four equivalent Ni(6), two equivalent Si(2), and four equivalent Si(4) atoms to form face-sharing NiSi6Ni6 cuboctahedra. In the second Ni site, Ni(2) is bonded in a 13-coordinate geometry to one Ni(1), one Ni(2), one Ni(3), two equivalent Ni(5), two equivalent Ni(6), one Si(1), one Si(2), two equivalent Si(3), and two equivalent Si(4) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent Ni(2), two equivalent Ni(4), one Si(1), one Si(2), and four equivalent Si(3) atoms. In the fourth Ni site, Ni(4) is bonded in a 10-coordinate geometry to one Ni(3), one Ni(5), two equivalent Ni(6), one Si(1), one Si(4), and four equivalent Si(3) atoms. In the fifth Ni site, Ni(5) is bonded in a 3-coordinate geometry to one Ni(4), two equivalent Ni(2), four equivalent Ni(6), one Si(4), and four equivalent Si(3) atoms. In the sixth Ni site, Ni(6) is bonded in a 12-coordinate geometry to one Ni(1), one Ni(2), one Ni(4), two equivalent Ni(5), two equivalent Ni(6), one Si(2), two equivalent Si(3), and two equivalent Si(4) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 5-coordinate geometry to one Ni(3), two equivalent Ni(2), and two equivalent Ni(4) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to one Ni(3), two equivalent Ni(1), two equivalent Ni(2), and four equivalent Ni(6) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one Ni(2), one Ni(3), two equivalent Ni(4), two equivalent Ni(5), and two equivalent Ni(6) atoms. In the fourth Si site, Si(4) is bonded in a 8-coordinate geometry to one Ni(4), one Ni(5), two equivalent Ni(1), two equivalent Ni(2), and four equivalent Ni(6) atoms. is represented by the CIF file [CIF]
data_Si2Ni3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.076
_cell_length_b   8.076
_cell_length_c   6.871
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   97.037
_symmetry_Int_Tables_number   1
_cell_volume   444.784
_cell_formula_units_Z   8
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  0.593  0.593  0.250  1.0
  Si  Si1  1  0.407  0.407  0.750  1.0
  Si  Si2  1  0.845  0.845  0.750  1.0
  Si  Si3  1  0.155  0.155  0.250  1.0
  Si  Si4  1  0.493  0.189  0.458  1.0
  Si  Si5  1  0.507  0.811  0.958  1.0
  Si  Si6  1  0.811  0.507  0.958  1.0
  Si  Si7  1  0.189  0.493  0.458  1.0
  Si  Si8  1  0.493  0.189  0.042  1.0
  Si  Si9  1  0.507  0.811  0.542  1.0
  Si  Si10  1  0.811  0.507  0.542  1.0
  Si  Si11  1  0.189  0.493  0.042  1.0
  Si  Si12  1  0.175  0.938  0.750  1.0
  Si  Si13  1  0.825  0.062  0.250  1.0
  Si  Si14  1  0.062  0.825  0.250  1.0
  Si  Si15  1  0.938  0.175  0.750  1.0
  Ni  Ni16  1  0.000  0.000  0.500  1.0
  Ni  Ni17  1  0.000  0.000  0.000  1.0
  Ni  Ni18  1  0.235  0.235  0.562  1.0
  Ni  Ni19  1  0.765  0.765  0.062  1.0
  Ni  Ni20  1  0.235  0.235  0.938  1.0
  Ni  Ni21  1  0.765  0.765  0.438  1.0
  Ni  Ni22  1  0.383  0.383  0.250  1.0
  Ni  Ni23  1  0.617  0.617  0.750  1.0
  Ni  Ni24  1  0.678  0.315  0.750  1.0
  Ni  Ni25  1  0.322  0.685  0.250  1.0
  Ni  Ni26  1  0.685  0.322  0.250  1.0
  Ni  Ni27  1  0.315  0.678  0.750  1.0
  Ni  Ni28  1  0.443  0.050  0.750  1.0
  Ni  Ni29  1  0.557  0.950  0.250  1.0
  Ni  Ni30  1  0.950  0.557  0.250  1.0
  Ni  Ni31  1  0.050  0.443  0.750  1.0
  Ni  Ni32  1  0.291  0.946  0.440  1.0
  Ni  Ni33  1  0.709  0.054  0.940  1.0
  Ni  Ni34  1  0.054  0.709  0.940  1.0
  Ni  Ni35  1  0.946  0.291  0.440  1.0
  Ni  Ni36  1  0.291  0.946  0.060  1.0
  Ni  Ni37  1  0.709  0.054  0.560  1.0
  Ni  Ni38  1  0.054  0.709  0.560  1.0
  Ni  Ni39  1  0.946  0.291  0.060  1.0
[/CIF]
.