The material structure described by Eu2Ni8Si3 crystallizes in the tetragonal P4_2/nmc space group. Eu(1) is bonded in a 13-coordinate geometry to one Ni(3), three equivalent Ni(2), six equivalent Ni(1), one Si(2), and two equivalent Si(1) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to three equivalent Eu(1), one Ni(3), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Si(1) atoms. In the second Ni site, Ni(2) is bonded in a 11-coordinate geometry to three equivalent Eu(1), one Ni(2), one Ni(3), four equivalent Ni(1), and two equivalent Si(1) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to one Eu(1), one Ni(2), two equivalent Ni(1), two equivalent Ni(3), two equivalent Si(1), and two equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to two equivalent Eu(1), two equivalent Ni(2), two equivalent Ni(3), and four equivalent Ni(1) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to two equivalent Eu(1) and four equivalent Ni(3) atoms. is represented by the CIF file [CIF]
data_Eu2Si3Ni8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.319
_cell_length_b   10.319
_cell_length_c   7.232
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   770.023
_cell_formula_units_Z   4
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
  Eu  Eu0  1  0.008  0.250  0.886  1.0
  Eu  Eu1  1  0.750  0.508  0.614  1.0
  Eu  Eu2  1  0.992  0.750  0.114  1.0
  Eu  Eu3  1  0.250  0.492  0.386  1.0
  Eu  Eu4  1  0.750  0.992  0.614  1.0
  Eu  Eu5  1  0.492  0.250  0.886  1.0
  Eu  Eu6  1  0.250  0.008  0.386  1.0
  Eu  Eu7  1  0.508  0.750  0.114  1.0
  Si  Si8  1  0.467  0.533  0.750  1.0
  Si  Si9  1  0.467  0.967  0.750  1.0
  Si  Si10  1  0.033  0.967  0.750  1.0
  Si  Si11  1  0.750  0.250  0.483  1.0
  Si  Si12  1  0.533  0.467  0.250  1.0
  Si  Si13  1  0.250  0.750  0.983  1.0
  Si  Si14  1  0.033  0.533  0.750  1.0
  Si  Si15  1  0.967  0.033  0.250  1.0
  Si  Si16  1  0.533  0.033  0.250  1.0
  Si  Si17  1  0.750  0.250  0.017  1.0
  Si  Si18  1  0.967  0.467  0.250  1.0
  Si  Si19  1  0.250  0.750  0.517  1.0
  Ni  Ni20  1  0.970  0.629  0.473  1.0
  Ni  Ni21  1  0.865  0.750  0.755  1.0
  Ni  Ni22  1  0.470  0.129  0.527  1.0
  Ni  Ni23  1  0.365  0.250  0.245  1.0
  Ni  Ni24  1  0.090  0.750  0.714  1.0
  Ni  Ni25  1  0.250  0.135  0.745  1.0
  Ni  Ni26  1  0.629  0.530  0.973  1.0
  Ni  Ni27  1  0.750  0.865  0.255  1.0
  Ni  Ni28  1  0.250  0.910  0.786  1.0
  Ni  Ni29  1  0.871  0.970  0.973  1.0
  Ni  Ni30  1  0.030  0.371  0.527  1.0
  Ni  Ni31  1  0.371  0.470  0.027  1.0
  Ni  Ni32  1  0.871  0.530  0.973  1.0
  Ni  Ni33  1  0.635  0.750  0.755  1.0
  Ni  Ni34  1  0.030  0.129  0.527  1.0
  Ni  Ni35  1  0.371  0.030  0.027  1.0
  Ni  Ni36  1  0.590  0.250  0.286  1.0
  Ni  Ni37  1  0.750  0.090  0.214  1.0
  Ni  Ni38  1  0.250  0.590  0.786  1.0
  Ni  Ni39  1  0.750  0.635  0.255  1.0
  Ni  Ni40  1  0.629  0.970  0.973  1.0
  Ni  Ni41  1  0.129  0.030  0.027  1.0
  Ni  Ni42  1  0.530  0.629  0.473  1.0
  Ni  Ni43  1  0.470  0.371  0.527  1.0
  Ni  Ni44  1  0.410  0.750  0.714  1.0
  Ni  Ni45  1  0.129  0.470  0.027  1.0
  Ni  Ni46  1  0.530  0.871  0.473  1.0
  Ni  Ni47  1  0.750  0.410  0.214  1.0
  Ni  Ni48  1  0.250  0.365  0.745  1.0
  Ni  Ni49  1  0.970  0.871  0.473  1.0
  Ni  Ni50  1  0.910  0.250  0.286  1.0
  Ni  Ni51  1  0.135  0.250  0.245  1.0
[/CIF]
.
The material structure described by Eu2Ni8Si3 crystallizes in the tetragonal P4_2/nmc space group. Eu(1) is bonded in a 13-coordinate geometry to one Ni(3), three equivalent Ni(2), six equivalent Ni(1), one Si(2), and two equivalent Si(1) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to three equivalent Eu(1), one Ni(3), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Si(1) atoms. In the second Ni site, Ni(2) is bonded in a 11-coordinate geometry to three equivalent Eu(1), one Ni(2), one Ni(3), four equivalent Ni(1), and two equivalent Si(1) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to one Eu(1), one Ni(2), two equivalent Ni(1), two equivalent Ni(3), two equivalent Si(1), and two equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to two equivalent Eu(1), two equivalent Ni(2), two equivalent Ni(3), and four equivalent Ni(1) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to two equivalent Eu(1) and four equivalent Ni(3) atoms. is represented by the CIF file [CIF]
data_Eu2Si3Ni8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.319
_cell_length_b   10.319
_cell_length_c   7.232
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   770.023
_cell_formula_units_Z   4
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
  Eu  Eu0  1  0.008  0.250  0.886  1.0
  Eu  Eu1  1  0.750  0.508  0.614  1.0
  Eu  Eu2  1  0.992  0.750  0.114  1.0
  Eu  Eu3  1  0.250  0.492  0.386  1.0
  Eu  Eu4  1  0.750  0.992  0.614  1.0
  Eu  Eu5  1  0.492  0.250  0.886  1.0
  Eu  Eu6  1  0.250  0.008  0.386  1.0
  Eu  Eu7  1  0.508  0.750  0.114  1.0
  Si  Si8  1  0.467  0.533  0.750  1.0
  Si  Si9  1  0.467  0.967  0.750  1.0
  Si  Si10  1  0.033  0.967  0.750  1.0
  Si  Si11  1  0.750  0.250  0.483  1.0
  Si  Si12  1  0.533  0.467  0.250  1.0
  Si  Si13  1  0.250  0.750  0.983  1.0
  Si  Si14  1  0.033  0.533  0.750  1.0
  Si  Si15  1  0.967  0.033  0.250  1.0
  Si  Si16  1  0.533  0.033  0.250  1.0
  Si  Si17  1  0.750  0.250  0.017  1.0
  Si  Si18  1  0.967  0.467  0.250  1.0
  Si  Si19  1  0.250  0.750  0.517  1.0
  Ni  Ni20  1  0.970  0.629  0.473  1.0
  Ni  Ni21  1  0.865  0.750  0.755  1.0
  Ni  Ni22  1  0.470  0.129  0.527  1.0
  Ni  Ni23  1  0.365  0.250  0.245  1.0
  Ni  Ni24  1  0.090  0.750  0.714  1.0
  Ni  Ni25  1  0.250  0.135  0.745  1.0
  Ni  Ni26  1  0.629  0.530  0.973  1.0
  Ni  Ni27  1  0.750  0.865  0.255  1.0
  Ni  Ni28  1  0.250  0.910  0.786  1.0
  Ni  Ni29  1  0.871  0.970  0.973  1.0
  Ni  Ni30  1  0.030  0.371  0.527  1.0
  Ni  Ni31  1  0.371  0.470  0.027  1.0
  Ni  Ni32  1  0.871  0.530  0.973  1.0
  Ni  Ni33  1  0.635  0.750  0.755  1.0
  Ni  Ni34  1  0.030  0.129  0.527  1.0
  Ni  Ni35  1  0.371  0.030  0.027  1.0
  Ni  Ni36  1  0.590  0.250  0.286  1.0
  Ni  Ni37  1  0.750  0.090  0.214  1.0
  Ni  Ni38  1  0.250  0.590  0.786  1.0
  Ni  Ni39  1  0.750  0.635  0.255  1.0
  Ni  Ni40  1  0.629  0.970  0.973  1.0
  Ni  Ni41  1  0.129  0.030  0.027  1.0
  Ni  Ni42  1  0.530  0.629  0.473  1.0
  Ni  Ni43  1  0.470  0.371  0.527  1.0
  Ni  Ni44  1  0.410  0.750  0.714  1.0
  Ni  Ni45  1  0.129  0.470  0.027  1.0
  Ni  Ni46  1  0.530  0.871  0.473  1.0
  Ni  Ni47  1  0.750  0.410  0.214  1.0
  Ni  Ni48  1  0.250  0.365  0.745  1.0
  Ni  Ni49  1  0.970  0.871  0.473  1.0
  Ni  Ni50  1  0.910  0.250  0.286  1.0
  Ni  Ni51  1  0.135  0.250  0.245  1.0
[/CIF]
.