data_TlGeIr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.46
_cell_length_b   4.46
_cell_length_c   4.46
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TlGeIr
_chemical_formula_sum   'Tl1 Ge1 Ir1'
_cell_volume   62.63
_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
  Tl  Tl2  1  0.58  0.58  0.58  1.0
  Ge  Ge0  1  0.0  0.0  0.0  1.0
  Ir  Ir1  1  0.73  0.73  0.73  1.0

data_TlGeIr
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.46
_cell_length_b   4.46
_cell_length_c   10.92
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   TlGeIr
_chemical_formula_sum   'Tl3 Ge3 Ir3'
_cell_volume   187.89
_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
  Tl  Tl0  3  0.0  0.0  0.42  1.0
  Ge  Ge1  3  0.0  0.0  0.0  1.0
  Ir  Ir2  3  0.0  0.0  0.27  1.0

Tl Ge Ir
IrTlGe is half-Heusler structured and crystallizes in the trigonal R3m space group. Ir(1) is bonded in a single-bond geometry to one Tl(1) and four equivalent Ge(1) atoms. The Ir(1)-Tl(1) bond length is 1.66 Å. There are three shorter (2.66 Å) and one longer (2.97 Å) Ir(1)-Ge(1) bond length. Tl(1) is bonded in a single-bond geometry to one Ir(1) and three equivalent Ge(1) atoms. All Tl(1)-Ge(1) bond lengths are 2.76 Å. Ge(1) is bonded to four equivalent Ir(1) and three equivalent Tl(1) atoms to form a mixture of distorted edge and corner-sharing GeTl3Ir4 hexagonal pyramids.