data_Ta2HgPt
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.81
_cell_length_b   9.81
_cell_length_c   9.81
_cell_angle_alpha   17.25
_cell_angle_beta   17.25
_cell_angle_gamma   17.25
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta2HgPt
_chemical_formula_sum   'Ta2 Hg1 Pt1'
_cell_volume   72.55
_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
  Ta  Ta2  1  0.0  0.0  0.38  1.0
  Ta  Ta3  1  0.0  0.0  0.61  1.0
  Hg  Hg0  1  0.0  0.0  0.5  1.0
  Pt  Pt1  1  0.0  0.0  0.0  1.0

data_Ta2HgPt
_symmetry_space_group_name_H-M   C2/m
_cell_length_a   5.1
_cell_length_b   2.94
_cell_length_c   9.81
_cell_angle_alpha   90.0
_cell_angle_beta   99.97
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   12
_chemical_formula_structural   Ta2HgPt
_chemical_formula_sum   'Ta4 Hg2 Pt2'
_cell_volume   145.11
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, -z'
  3  '-x, y, -z'
  4  'x, -y, z'
  5  'x+1/2, y+1/2, z'
  6  '-x+1/2, -y+1/2, -z'
  7  '-x+1/2, y+1/2, -z'
  8  'x+1/2, -y+1/2, 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
  Ta  Ta0  4  0.0  0.0  0.38  1.0
  Hg  Hg1  2  0.0  0.0  0.5  1.0
  Pt  Pt2  2  0.0  0.0  0.0  1.0

Ta Ta Hg Pt
Ta2PtHg crystallizes in the monoclinic Cm space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a single-bond geometry to one Pt(1) and one Hg(1) atom. The Ta(1)-Pt(1) bond length is 3.76 Å. The Ta(1)-Hg(1) bond length is 1.13 Å. In the second Ta site, Ta(2) is bonded in a single-bond geometry to one Pt(1) and one Hg(1) atom. The Ta(2)-Pt(1) bond length is 3.79 Å. The Ta(2)-Hg(1) bond length is 1.13 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one Ta(1); one Ta(2); and six Pt(1,1) atoms to form a mixture of distorted corner and edge-sharing PtTa2Pt6 hexagonal bipyramids. All Pt(1)-Pt(1,1) bond lengths are 2.94 Å. In the second Pt site, Pt(1) is bonded to one Ta(1); one Ta(2); and six Pt(1,1) atoms to form a mixture of distorted corner and edge-sharing PtTa2Pt6 hexagonal bipyramids. The Pt(1)-Ta(1) bond length is 3.76 Å. The Pt(1)-Ta(2) bond length is 3.79 Å. Both Pt(1)-Pt(1) bond lengths are 2.94 Å. Hg(1) is bonded in a linear geometry to one Ta(1) and one Ta(2) atom.