data_LiHg2As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.94
_cell_length_b   4.94
_cell_length_c   4.94
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   LiHg2As
_chemical_formula_sum   'Li1 Hg2 As1'
_cell_volume   85.17
_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
  Li  Li3  1  0.0  0.0  0.0  1.0
  Hg  Hg1  1  0.24  0.24  0.24  1.0
  Hg  Hg2  1  0.49  0.49  0.49  1.0
  As  As0  1  0.75  0.75  0.75  1.0

data_LiHg2As
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.94
_cell_length_b   4.94
_cell_length_c   12.1
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   LiHg2As
_chemical_formula_sum   'Li3 Hg6 As3'
_cell_volume   255.51
_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
  Li  Li0  3  0.0  0.0  0.0  1.0
  Hg  Hg1  3  0.0  0.0  0.51  1.0
  Hg  Hg2  3  0.0  0.0  0.76  1.0
  As  As3  3  0.0  0.0  0.25  1.0

Li Hg Hg As
LiHg2As crystallizes in the trigonal R3m space group. Li(1) is bonded in a body-centered cubic geometry to four equivalent Hg(1) and four equivalent As(1) atoms. There is one shorter (2.88 Å) and three longer (3.08 Å) Li(1)-Hg(1) bond lengths. There are three shorter (3.01 Å) and one longer (3.07 Å) Li(1)-As(1) bond length. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded to four equivalent Li(1) and four equivalent Hg(2) atoms to form distorted edge-sharing HgLi4Hg4 tetrahedra. There are three shorter (3.01 Å) and one longer (3.07 Å) Hg(1)-Hg(2) bond length. In the second Hg site, Hg(2) is bonded in a distorted body-centered cubic geometry to four equivalent Hg(1) and four equivalent As(1) atoms. There are three shorter (3.01 Å) and one longer (3.07 Å) Hg(2)-As(1) bond length. As(1) is bonded in a body-centered cubic geometry to four equivalent Li(1) and four equivalent Hg(2) atoms.