The material structure described by CeIr2Si crystallizes in the tetragonal I4_1/amd space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 14-coordinate geometry to two equivalent Ir(1), two equivalent Ir(2), six equivalent Ir(3), and four equivalent Si(1) atoms. In the second Ce site, Ce(1) is bonded in a 14-coordinate geometry to two equivalent Ir(1), two equivalent Ir(2), six equivalent Ir(3), and four equivalent Si(1) atoms. There are three inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four Ce(1,1) and four equivalent Si(1) atoms to form a mixture of distorted edge and face-sharing IrCe4Si4 tetrahedra. In the second Ir site, Ir(2) is bonded to four equivalent Ce(1) and four equivalent Si(1) atoms to form a mixture of distorted edge and face-sharing IrCe4Si4 tetrahedra. In the third Ir site, Ir(3) is bonded in a 9-coordinate geometry to six Ce(1,1); two equivalent Ir(3); and one Si(1) atom. Si(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), one Ir(3), two equivalent Ir(1), and two equivalent Ir(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CeSiIr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   18.257
_cell_length_b   18.257
_cell_length_c   18.257
_cell_angle_alpha   167.255
_cell_angle_beta   167.255
_cell_angle_gamma   18.061
_symmetry_Int_Tables_number   1
_cell_volume   296.130
_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
  Ce  Ce0  1  0.676  0.676  0.000  1.0
  Ce  Ce1  1  0.426  0.926  0.500  1.0
  Ce  Ce2  1  0.074  0.574  0.500  1.0
  Ce  Ce3  1  0.324  0.324  0.000  1.0
  Si  Si4  1  0.786  0.786  0.000  1.0
  Si  Si5  1  0.536  0.036  0.500  1.0
  Si  Si6  1  0.964  0.464  0.500  1.0
  Si  Si7  1  0.214  0.214  0.000  1.0
  Ir  Ir8  1  0.750  0.250  0.500  1.0
  Ir  Ir9  1  0.000  0.000  0.000  1.0
  Ir  Ir10  1  0.500  0.500  0.000  1.0
  Ir  Ir11  1  0.250  0.750  0.500  1.0
  Ir  Ir12  1  0.852  0.852  0.000  1.0
  Ir  Ir13  1  0.602  0.102  0.500  1.0
  Ir  Ir14  1  0.898  0.398  0.500  1.0
  Ir  Ir15  1  0.148  0.148  0.000  1.0
[/CIF]
.
The material structure described by CeIr2Si crystallizes in the tetragonal I4_1/amd space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 14-coordinate geometry to two equivalent Ir(1), two equivalent Ir(2), six equivalent Ir(3), and four equivalent Si(1) atoms. In the second Ce site, Ce(1) is bonded in a 14-coordinate geometry to two equivalent Ir(1), two equivalent Ir(2), six equivalent Ir(3), and four equivalent Si(1) atoms. There are three inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to four Ce(1,1) and four equivalent Si(1) atoms to form a mixture of distorted edge and face-sharing IrCe4Si4 tetrahedra. In the second Ir site, Ir(2) is bonded to four equivalent Ce(1) and four equivalent Si(1) atoms to form a mixture of distorted edge and face-sharing IrCe4Si4 tetrahedra. In the third Ir site, Ir(3) is bonded in a 9-coordinate geometry to six Ce(1,1); two equivalent Ir(3); and one Si(1) atom. Si(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), one Ir(3), two equivalent Ir(1), and two equivalent Ir(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CeSiIr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   18.257
_cell_length_b   18.257
_cell_length_c   18.257
_cell_angle_alpha   167.255
_cell_angle_beta   167.255
_cell_angle_gamma   18.061
_symmetry_Int_Tables_number   1
_cell_volume   296.130
_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
  Ce  Ce0  1  0.676  0.676  0.000  1.0
  Ce  Ce1  1  0.426  0.926  0.500  1.0
  Ce  Ce2  1  0.074  0.574  0.500  1.0
  Ce  Ce3  1  0.324  0.324  0.000  1.0
  Si  Si4  1  0.786  0.786  0.000  1.0
  Si  Si5  1  0.536  0.036  0.500  1.0
  Si  Si6  1  0.964  0.464  0.500  1.0
  Si  Si7  1  0.214  0.214  0.000  1.0
  Ir  Ir8  1  0.750  0.250  0.500  1.0
  Ir  Ir9  1  0.000  0.000  0.000  1.0
  Ir  Ir10  1  0.500  0.500  0.000  1.0
  Ir  Ir11  1  0.250  0.750  0.500  1.0
  Ir  Ir12  1  0.852  0.852  0.000  1.0
  Ir  Ir13  1  0.602  0.102  0.500  1.0
  Ir  Ir14  1  0.898  0.398  0.500  1.0
  Ir  Ir15  1  0.148  0.148  0.000  1.0
[/CIF]
.