The compound described by Ag3Si crystallizes in the hexagonal P-6m2 space group. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to six equivalent Ag(1) and six equivalent Ag(2) atoms to form AgAg12 cuboctahedra that share corners with six equivalent Ag(1)Ag12 cuboctahedra, corners with twelve equivalent Si(1)Ag6 cuboctahedra, edges with six equivalent Ag(1)Ag12 cuboctahedra, edges with twelve equivalent Ag(2)Si3Ag9 cuboctahedra, faces with two equivalent Si(1)Ag6 cuboctahedra, faces with six equivalent Ag(1)Ag12 cuboctahedra, and faces with twelve equivalent Ag(2)Si3Ag9 cuboctahedra. In the second Ag site, Ag(2) is bonded to three equivalent Ag(1), six equivalent Ag(2), and three equivalent Si(1) atoms to form AgSi3Ag9 cuboctahedra that share corners with six equivalent Si(1)Ag6 cuboctahedra, corners with eighteen equivalent Ag(2)Si3Ag9 cuboctahedra, edges with six equivalent Ag(1)Ag12 cuboctahedra, edges with six equivalent Ag(2)Si3Ag9 cuboctahedra, edges with six equivalent Si(1)Ag6 cuboctahedra, faces with six equivalent Ag(1)Ag12 cuboctahedra, and faces with eight equivalent Ag(2)Si3Ag9 cuboctahedra. Si(1) is bonded to six equivalent Ag(2) atoms to form distorted SiAg6 cuboctahedra that share corners with twelve equivalent Ag(1)Ag12 cuboctahedra, corners with twelve equivalent Ag(2)Si3Ag9 cuboctahedra, edges with six equivalent Si(1)Ag6 cuboctahedra, edges with twelve equivalent Ag(2)Si3Ag9 cuboctahedra, and faces with two equivalent Ag(1)Ag12 cuboctahedra. is represented by the CIF card [CIF]
data_SiAg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.940
_cell_length_b   2.940
_cell_length_c   9.222
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   69.049
_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  0.333  0.667  0.500  1.0
  Ag  Ag1  1  0.333  0.667  0.000  1.0
  Ag  Ag2  1  0.667  0.333  0.738  1.0
  Ag  Ag3  1  0.667  0.333  0.262  1.0
[/CIF]
.
The compound described by Ag3Si crystallizes in the hexagonal P-6m2 space group. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to six equivalent Ag(1) and six equivalent Ag(2) atoms to form AgAg12 cuboctahedra that share corners with six equivalent Ag(1)Ag12 cuboctahedra, corners with twelve equivalent Si(1)Ag6 cuboctahedra, edges with six equivalent Ag(1)Ag12 cuboctahedra, edges with twelve equivalent Ag(2)Si3Ag9 cuboctahedra, faces with two equivalent Si(1)Ag6 cuboctahedra, faces with six equivalent Ag(1)Ag12 cuboctahedra, and faces with twelve equivalent Ag(2)Si3Ag9 cuboctahedra. In the second Ag site, Ag(2) is bonded to three equivalent Ag(1), six equivalent Ag(2), and three equivalent Si(1) atoms to form AgSi3Ag9 cuboctahedra that share corners with six equivalent Si(1)Ag6 cuboctahedra, corners with eighteen equivalent Ag(2)Si3Ag9 cuboctahedra, edges with six equivalent Ag(1)Ag12 cuboctahedra, edges with six equivalent Ag(2)Si3Ag9 cuboctahedra, edges with six equivalent Si(1)Ag6 cuboctahedra, faces with six equivalent Ag(1)Ag12 cuboctahedra, and faces with eight equivalent Ag(2)Si3Ag9 cuboctahedra. Si(1) is bonded to six equivalent Ag(2) atoms to form distorted SiAg6 cuboctahedra that share corners with twelve equivalent Ag(1)Ag12 cuboctahedra, corners with twelve equivalent Ag(2)Si3Ag9 cuboctahedra, edges with six equivalent Si(1)Ag6 cuboctahedra, edges with twelve equivalent Ag(2)Si3Ag9 cuboctahedra, and faces with two equivalent Ag(1)Ag12 cuboctahedra. is represented by the CIF card [CIF]
data_SiAg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.940
_cell_length_b   2.940
_cell_length_c   9.222
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   69.049
_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  0.333  0.667  0.500  1.0
  Ag  Ag1  1  0.333  0.667  0.000  1.0
  Ag  Ag2  1  0.667  0.333  0.738  1.0
  Ag  Ag3  1  0.667  0.333  0.262  1.0
[/CIF]
.