data_Ta2TlPb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.34
_cell_length_b   4.34
_cell_length_c   4.54
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ta2TlPb
_chemical_formula_sum   'Ta2 Tl1 Pb1'
_cell_volume   85.71
_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  Ta1  1  0.17  0.0  0.27  1.0
  Ta  Ta2  1  0.0  0.17  0.27  1.0
  Tl  Tl3  1  0.0  0.0  0.0  1.0
  Pb  Pb0  1  0.17  0.17  0.0  1.0

data_Ta2TlPb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.14
_cell_length_b   6.14
_cell_length_c   4.54
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Ta2TlPb
_chemical_formula_sum   'Ta4 Tl2 Pb2'
_cell_volume   171.42
_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+1/2, y+1/2, z'
  4  '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  0.09  0.09  0.27  1.0
  Tl  Tl1  2  0.0  0.0  0.0  1.0
  Pb  Pb2  2  0.17  0.0  -0.0  1.0

Ta Ta Tl Pb
Ta2TlPb is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Ta2TlPb clusters. Ta(1) is bonded in a 3-coordinate geometry to one Ta(1), one Tl(1), and one Pb(1) atom. The Ta(1)-Ta(1) bond length is 1.06 Å. The Ta(1)-Tl(1) bond length is 1.44 Å. The Ta(1)-Pb(1) bond length is 1.44 Å. Tl(1) is bonded in a distorted single-bond geometry to two equivalent Ta(1) and one Pb(1) atom. The Tl(1)-Pb(1) bond length is 1.06 Å. Pb(1) is bonded in a 3-coordinate geometry to two equivalent Ta(1) and one Tl(1) atom.