data_YbNbTl2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.09
_cell_length_b   5.09
_cell_length_c   5.09
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   YbNbTl2
_chemical_formula_sum   'Yb1 Nb1 Tl2'
_cell_volume   93.25
_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
  Yb  Yb3  1  0.6  0.6  0.6  1.0
  Nb  Nb0  1  0.0  0.0  0.0  1.0
  Tl  Tl1  1  0.4  0.4  0.4  1.0
  Tl  Tl2  1  0.8  0.8  0.8  1.0

data_YbNbTl2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.09
_cell_length_b   5.09
_cell_length_c   12.47
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   YbNbTl2
_chemical_formula_sum   'Yb3 Nb3 Tl6'
_cell_volume   279.74
_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
  Yb  Yb0  3  0.0  0.0  0.4  1.0
  Nb  Nb1  3  0.0  0.0  0.0  1.0
  Tl  Tl2  3  0.0  0.0  0.2  1.0
  Tl  Tl3  3  0.0  0.0  0.6  1.0

Yb Nb Tl Tl
Yb Nb Tl Tl 0 2 o o o 0 2 o + o 0 2 + o o 0 2 o o + 0 1 o + + 0 1 + o + 0 1 + + o 0 3 o o o 1 3 - - - 1 3 - - o 1 3 o - - 1 3 - o - 1 2 - o o 1 2 o - o 1 2 o o - 2 3 - o o 2 3 o - o 2 3 o o - 
YbNbTl2 crystallizes in the trigonal R3m space group. Yb(1) is bonded in a 2-coordinate geometry to three equivalent Nb(1), one Tl(1), and one Tl(2) atom. All Yb(1)-Nb(1) bond lengths are 3.06 Å. The Yb(1)-Tl(1) bond length is 2.50 Å. The Yb(1)-Tl(2) bond length is 2.50 Å. Nb(1) is bonded in a 10-coordinate geometry to three equivalent Yb(1), three equivalent Tl(1), and four equivalent Tl(2) atoms. All Nb(1)-Tl(1) bond lengths are 3.05 Å. There is one shorter (2.50 Å) and three longer (3.37 Å) Nb(1)-Tl(2) bond lengths. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a single-bond geometry to one Yb(1) and three equivalent Nb(1) atoms. In the second Tl site, Tl(2) is bonded in a 1-coordinate geometry to one Yb(1) and four equivalent Nb(1) atoms.