The structure described by Ir2Si crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to six equivalent Ir(2) and five equivalent Si(1) atoms to form a mixture of distorted corner and face-sharing IrSi5Ir6 trigonal bipyramids. In the second Ir site, Ir(2) is bonded in a 14-coordinate geometry to two equivalent Ir(2), six equivalent Ir(1), and six equivalent Si(1) atoms. Si(1) is bonded in a 11-coordinate geometry to five equivalent Ir(1) and six equivalent Ir(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_SiIr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.194
_cell_length_b   4.194
_cell_length_c   5.505
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   83.877
_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
  Si  Si0  1  0.333  0.667  0.250  1.0
  Si  Si1  1  0.667  0.333  0.750  1.0
  Ir  Ir2  1  0.333  0.667  0.750  1.0
  Ir  Ir3  1  0.667  0.333  0.250  1.0
  Ir  Ir4  1  0.000  0.000  0.000  1.0
  Ir  Ir5  1  0.000  0.000  0.500  1.0
[/CIF]
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The structure described by Ir2Si crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded to six equivalent Ir(2) and five equivalent Si(1) atoms to form a mixture of distorted corner and face-sharing IrSi5Ir6 trigonal bipyramids. In the second Ir site, Ir(2) is bonded in a 14-coordinate geometry to two equivalent Ir(2), six equivalent Ir(1), and six equivalent Si(1) atoms. Si(1) is bonded in a 11-coordinate geometry to five equivalent Ir(1) and six equivalent Ir(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_SiIr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.194
_cell_length_b   4.194
_cell_length_c   5.505
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   83.877
_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
  Si  Si0  1  0.333  0.667  0.250  1.0
  Si  Si1  1  0.667  0.333  0.750  1.0
  Ir  Ir2  1  0.333  0.667  0.750  1.0
  Ir  Ir3  1  0.667  0.333  0.250  1.0
  Ir  Ir4  1  0.000  0.000  0.000  1.0
  Ir  Ir5  1  0.000  0.000  0.500  1.0
[/CIF]
.