The crystal structure described by UIrSi3 crystallizes in the tetragonal I4mm space group. U(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Si(1), and eight equivalent Si(2) atoms. Ir(1) is bonded in a 5-coordinate geometry to four equivalent U(1), one Si(1), and four equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted single-bond geometry to four equivalent U(1), one Ir(1), and four equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a distorted bent 120 degrees geometry to four equivalent U(1), two equivalent Ir(1), and two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_USi3Ir
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.729
_cell_length_b   5.729
_cell_length_c   5.729
_cell_angle_alpha   137.299
_cell_angle_beta   137.299
_cell_angle_gamma   61.978
_symmetry_Int_Tables_number   1
_cell_volume   85.454
_cell_formula_units_Z   1
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
  U  U0  1  0.999  0.999  0.000  1.0
  Si  Si1  1  0.413  0.413  0.000  1.0
  Si  Si2  1  0.266  0.766  0.500  1.0
  Si  Si3  1  0.766  0.266  0.500  1.0
  Ir  Ir4  1  0.652  0.652  0.000  1.0
[/CIF]
.
The crystal structure described by UIrSi3 crystallizes in the tetragonal I4mm space group. U(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Si(1), and eight equivalent Si(2) atoms. Ir(1) is bonded in a 5-coordinate geometry to four equivalent U(1), one Si(1), and four equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted single-bond geometry to four equivalent U(1), one Ir(1), and four equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a distorted bent 120 degrees geometry to four equivalent U(1), two equivalent Ir(1), and two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_USi3Ir
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.729
_cell_length_b   5.729
_cell_length_c   5.729
_cell_angle_alpha   137.299
_cell_angle_beta   137.299
_cell_angle_gamma   61.978
_symmetry_Int_Tables_number   1
_cell_volume   85.454
_cell_formula_units_Z   1
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
  U  U0  1  0.999  0.999  0.000  1.0
  Si  Si1  1  0.413  0.413  0.000  1.0
  Si  Si2  1  0.266  0.766  0.500  1.0
  Si  Si3  1  0.766  0.266  0.500  1.0
  Ir  Ir4  1  0.652  0.652  0.000  1.0
[/CIF]
.