data_AgHg3Rh
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.21
_cell_length_b   5.21
_cell_length_c   5.21
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AgHg3Rh
_chemical_formula_sum   'Ag1 Hg3 Rh1'
_cell_volume   141.14
_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
  Ag  Ag4  1  0.6  0.6  0.6  1.0
  Hg  Hg1  1  0.0  0.6  0.0  1.0
  Hg  Hg2  1  0.0  0.0  0.6  1.0
  Hg  Hg3  1  0.6  0.0  0.0  1.0
  Rh  Rh0  1  0.0  0.0  0.0  1.0

data_AgHg3Rh
_symmetry_space_group_name_H-M   R3m
_cell_length_a   7.36
_cell_length_b   7.36
_cell_length_c   9.02
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   AgHg3Rh
_chemical_formula_sum   'Ag3 Hg9 Rh3'
_cell_volume   423.41
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Ag  Ag0  3  0.0  0.0  0.6  1.0
  Hg  Hg1  9  0.07  0.53  0.53  1.0
  Rh  Rh2  3  0.0  0.0  0.0  1.0

Ag Hg Hg Hg Rh
Ag Hg Hg Hg Rh 0 2 + + o 0 1 + o + 0 3 o + + 1 4 o + o 2 4 o o + 3 4 + o o 
RhAgHg3 crystallizes in the trigonal R3m space group. Rh(1) is bonded to six equivalent Hg(1) atoms to form distorted corner-sharing RhHg6 octahedra. The corner-sharing octahedra are not tilted. There are three shorter (2.07 Å) and three longer (3.14 Å) Rh(1)-Hg(1) bond lengths. Ag(1) is bonded in a 3-coordinate geometry to three equivalent Hg(1) atoms. All Ag(1)-Hg(1) bond lengths are 2.92 Å. Hg(1) is bonded in a distorted single-bond geometry to two equivalent Rh(1) and one Ag(1) atom.