The structure described by Pt3Hg crystallizes in the tetragonal P4/mmm space group. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Pt(1), four equivalent Pt(2), and four equivalent Hg(1) atoms to form PtHg4Pt8 cuboctahedra that share corners with twelve equivalent Pt(1)Hg4Pt8 cuboctahedra, edges with eight equivalent Pt(1)Hg4Pt8 cuboctahedra, edges with eight equivalent Pt(2)Pt12 cuboctahedra, edges with eight equivalent Hg(1)Hg4Pt8 cuboctahedra, faces with four equivalent Pt(2)Pt12 cuboctahedra, faces with four equivalent Hg(1)Hg4Pt8 cuboctahedra, and faces with ten equivalent Pt(1)Hg4Pt8 cuboctahedra. In the second Pt site, Pt(2) is bonded to four equivalent Pt(2) and eight equivalent Pt(1) atoms to form PtPt12 cuboctahedra that share corners with four equivalent Pt(2)Pt12 cuboctahedra, corners with eight equivalent Hg(1)Hg4Pt8 cuboctahedra, edges with eight equivalent Hg(1)Hg4Pt8 cuboctahedra, edges with sixteen equivalent Pt(1)Hg4Pt8 cuboctahedra, faces with two equivalent Hg(1)Hg4Pt8 cuboctahedra, faces with eight equivalent Pt(1)Hg4Pt8 cuboctahedra, and faces with eight equivalent Pt(2)Pt12 cuboctahedra. Hg(1) is bonded to eight equivalent Pt(1) and four equivalent Hg(1) atoms to form HgHg4Pt8 cuboctahedra that share corners with four equivalent Hg(1)Hg4Pt8 cuboctahedra, corners with eight equivalent Pt(2)Pt12 cuboctahedra, edges with eight equivalent Pt(2)Pt12 cuboctahedra, edges with sixteen equivalent Pt(1)Hg4Pt8 cuboctahedra, faces with two equivalent Pt(2)Pt12 cuboctahedra, faces with eight equivalent Pt(1)Hg4Pt8 cuboctahedra, and faces with eight equivalent Hg(1)Hg4Pt8 cuboctahedra. is represented by the CIF file [CIF]
data_HgPt3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.930
_cell_length_b   2.930
_cell_length_c   7.906
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   89.831
_symmetry_Int_Tables_number   1
_cell_volume   67.850
_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
  Hg  Hg0  1  0.000  0.000  0.000  1.0
  Pt  Pt1  1  0.500  0.500  0.264  1.0
  Pt  Pt2  1  0.000  0.000  0.500  1.0
  Pt  Pt3  1  0.500  0.500  0.736  1.0
[/CIF]
.
The structure described by Pt3Hg crystallizes in the tetragonal P4/mmm space group. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Pt(1), four equivalent Pt(2), and four equivalent Hg(1) atoms to form PtHg4Pt8 cuboctahedra that share corners with twelve equivalent Pt(1)Hg4Pt8 cuboctahedra, edges with eight equivalent Pt(1)Hg4Pt8 cuboctahedra, edges with eight equivalent Pt(2)Pt12 cuboctahedra, edges with eight equivalent Hg(1)Hg4Pt8 cuboctahedra, faces with four equivalent Pt(2)Pt12 cuboctahedra, faces with four equivalent Hg(1)Hg4Pt8 cuboctahedra, and faces with ten equivalent Pt(1)Hg4Pt8 cuboctahedra. In the second Pt site, Pt(2) is bonded to four equivalent Pt(2) and eight equivalent Pt(1) atoms to form PtPt12 cuboctahedra that share corners with four equivalent Pt(2)Pt12 cuboctahedra, corners with eight equivalent Hg(1)Hg4Pt8 cuboctahedra, edges with eight equivalent Hg(1)Hg4Pt8 cuboctahedra, edges with sixteen equivalent Pt(1)Hg4Pt8 cuboctahedra, faces with two equivalent Hg(1)Hg4Pt8 cuboctahedra, faces with eight equivalent Pt(1)Hg4Pt8 cuboctahedra, and faces with eight equivalent Pt(2)Pt12 cuboctahedra. Hg(1) is bonded to eight equivalent Pt(1) and four equivalent Hg(1) atoms to form HgHg4Pt8 cuboctahedra that share corners with four equivalent Hg(1)Hg4Pt8 cuboctahedra, corners with eight equivalent Pt(2)Pt12 cuboctahedra, edges with eight equivalent Pt(2)Pt12 cuboctahedra, edges with sixteen equivalent Pt(1)Hg4Pt8 cuboctahedra, faces with two equivalent Pt(2)Pt12 cuboctahedra, faces with eight equivalent Pt(1)Hg4Pt8 cuboctahedra, and faces with eight equivalent Hg(1)Hg4Pt8 cuboctahedra. is represented by the CIF file [CIF]
data_HgPt3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.930
_cell_length_b   2.930
_cell_length_c   7.906
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   89.831
_symmetry_Int_Tables_number   1
_cell_volume   67.850
_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
  Hg  Hg0  1  0.000  0.000  0.000  1.0
  Pt  Pt1  1  0.500  0.500  0.264  1.0
  Pt  Pt2  1  0.000  0.000  0.500  1.0
  Pt  Pt3  1  0.500  0.500  0.736  1.0
[/CIF]
.