The compound described by USi2 is hexagonal omega structure-like structured and crystallizes in the tetragonal I4_1/amd space group. U(1) is bonded to twelve equivalent Si(1) atoms to form a mixture of edge and face-sharing USi12 cuboctahedra. Si(1) is bonded in a 9-coordinate geometry to six equivalent U(1) and three equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_USi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.542
_cell_length_b   7.542
_cell_length_c   7.542
_cell_angle_alpha   150.346
_cell_angle_beta   150.346
_cell_angle_gamma   42.433
_symmetry_Int_Tables_number   1
_cell_volume   104.772
_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
  U  U0  1  0.750  0.250  0.500  1.0
  U  U1  1  0.000  0.000  0.000  1.0
  Si  Si2  1  0.168  0.668  0.500  1.0
  Si  Si3  1  0.582  0.582  0.000  1.0
  Si  Si4  1  0.332  0.832  0.500  1.0
  Si  Si5  1  0.418  0.418  0.000  1.0
[/CIF]
.
The compound described by USi2 is hexagonal omega structure-like structured and crystallizes in the tetragonal I4_1/amd space group. U(1) is bonded to twelve equivalent Si(1) atoms to form a mixture of edge and face-sharing USi12 cuboctahedra. Si(1) is bonded in a 9-coordinate geometry to six equivalent U(1) and three equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_USi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.542
_cell_length_b   7.542
_cell_length_c   7.542
_cell_angle_alpha   150.346
_cell_angle_beta   150.346
_cell_angle_gamma   42.433
_symmetry_Int_Tables_number   1
_cell_volume   104.772
_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
  U  U0  1  0.750  0.250  0.500  1.0
  U  U1  1  0.000  0.000  0.000  1.0
  Si  Si2  1  0.168  0.668  0.500  1.0
  Si  Si3  1  0.582  0.582  0.000  1.0
  Si  Si4  1  0.332  0.832  0.500  1.0
  Si  Si5  1  0.418  0.418  0.000  1.0
[/CIF]
.