The crystal structure described by Hg3Si crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 8-coordinate geometry to four equivalent Hg(1) and four equivalent Hg(2) atoms. In the second Hg site, Hg(2) is bonded in a distorted square co-planar geometry to eight equivalent Hg(1) and four equivalent Si(1) atoms. Si(1) is bonded in a square co-planar geometry to four equivalent Hg(2) atoms. is represented by the CIF card [CIF]
data_SiHg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.837
_cell_length_b   5.837
_cell_length_c   5.837
_cell_angle_alpha   136.598
_cell_angle_beta   136.598
_cell_angle_gamma   63.057
_symmetry_Int_Tables_number   1
_cell_volume   92.699
_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
  Si  Si0  1  0.000  0.000  0.000  1.0
  Hg  Hg1  1  0.750  0.250  0.500  1.0
  Hg  Hg2  1  0.250  0.750  0.500  1.0
  Hg  Hg3  1  0.500  0.500  0.000  1.0
[/CIF]
.
The crystal structure described by Hg3Si crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 8-coordinate geometry to four equivalent Hg(1) and four equivalent Hg(2) atoms. In the second Hg site, Hg(2) is bonded in a distorted square co-planar geometry to eight equivalent Hg(1) and four equivalent Si(1) atoms. Si(1) is bonded in a square co-planar geometry to four equivalent Hg(2) atoms. is represented by the CIF card [CIF]
data_SiHg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.837
_cell_length_b   5.837
_cell_length_c   5.837
_cell_angle_alpha   136.598
_cell_angle_beta   136.598
_cell_angle_gamma   63.057
_symmetry_Int_Tables_number   1
_cell_volume   92.699
_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
  Si  Si0  1  0.000  0.000  0.000  1.0
  Hg  Hg1  1  0.750  0.250  0.500  1.0
  Hg  Hg2  1  0.250  0.750  0.500  1.0
  Hg  Hg3  1  0.500  0.500  0.000  1.0
[/CIF]
.