The crystal structure described by EuSi2 is hexagonal omega structure-like structured and crystallizes in the tetragonal I4_1/amd space group. Eu(1) is bonded to twelve Si(1,1) atoms to form a mixture of edge and face-sharing EuSi12 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Eu(1) and three equivalent Si(1) atoms. In the second Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Eu(1) and three Si(1,1) atoms. is represented by the CIF card [CIF]
data_EuSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.279
_cell_length_b   4.279
_cell_length_c   7.482
_cell_angle_alpha   106.616
_cell_angle_beta   106.616
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   125.269
_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
  Eu  Eu0  1  0.250  0.750  0.500  1.0
  Eu  Eu1  1  0.000  0.000  0.000  1.0
  Si  Si2  1  0.666  0.166  0.332  1.0
  Si  Si3  1  0.584  0.584  0.168  1.0
  Si  Si4  1  0.834  0.334  0.668  1.0
  Si  Si5  1  0.416  0.416  0.832  1.0
[/CIF]
.
The crystal structure described by EuSi2 is hexagonal omega structure-like structured and crystallizes in the tetragonal I4_1/amd space group. Eu(1) is bonded to twelve Si(1,1) atoms to form a mixture of edge and face-sharing EuSi12 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Eu(1) and three equivalent Si(1) atoms. In the second Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent Eu(1) and three Si(1,1) atoms. is represented by the CIF card [CIF]
data_EuSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.279
_cell_length_b   4.279
_cell_length_c   7.482
_cell_angle_alpha   106.616
_cell_angle_beta   106.616
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   125.269
_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
  Eu  Eu0  1  0.250  0.750  0.500  1.0
  Eu  Eu1  1  0.000  0.000  0.000  1.0
  Si  Si2  1  0.666  0.166  0.332  1.0
  Si  Si3  1  0.584  0.584  0.168  1.0
  Si  Si4  1  0.834  0.334  0.668  1.0
  Si  Si5  1  0.416  0.416  0.832  1.0
[/CIF]
.