The crystal structure described by LaSi2 is hexagonal omega structure-like structured and crystallizes in the tetragonal I4_1/amd space group. La(1) is bonded to twelve Si(1,1) atoms to form a mixture of edge and face-sharing LaSi12 cuboctahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1) and three equivalent Si(1) atoms. In the second Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1) and three Si(1,1) atoms. In the third Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1) and three equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.388
_cell_length_b   4.388
_cell_length_c   7.479
_cell_angle_alpha   107.060
_cell_angle_beta   107.060
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   131.049
_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
  La  La0  1  0.875  0.625  0.250  1.0
  La  La1  1  0.125  0.375  0.750  1.0
  Si  Si2  1  0.711  0.961  0.922  1.0
  Si  Si3  1  0.461  0.211  0.422  1.0
  Si  Si4  1  0.539  0.789  0.578  1.0
  Si  Si5  1  0.289  0.039  0.078  1.0
[/CIF]
.
The crystal structure described by LaSi2 is hexagonal omega structure-like structured and crystallizes in the tetragonal I4_1/amd space group. La(1) is bonded to twelve Si(1,1) atoms to form a mixture of edge and face-sharing LaSi12 cuboctahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1) and three equivalent Si(1) atoms. In the second Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1) and three Si(1,1) atoms. In the third Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1) and three equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.388
_cell_length_b   4.388
_cell_length_c   7.479
_cell_angle_alpha   107.060
_cell_angle_beta   107.060
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   131.049
_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
  La  La0  1  0.875  0.625  0.250  1.0
  La  La1  1  0.125  0.375  0.750  1.0
  Si  Si2  1  0.711  0.961  0.922  1.0
  Si  Si3  1  0.461  0.211  0.422  1.0
  Si  Si4  1  0.539  0.789  0.578  1.0
  Si  Si5  1  0.289  0.039  0.078  1.0
[/CIF]
.