data_TlBAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.59
_cell_length_b   4.59
_cell_length_c   4.59
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TlBAs
_chemical_formula_sum   'Tl1 B1 As1'
_cell_volume   68.57
_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  0.25  0.25  0.25  1.0
  B  B1  1  0.0  0.0  0.0  1.0
  As  As0  1  0.62  0.62  0.62  1.0

data_TlBAs
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.59
_cell_length_b   4.59
_cell_length_c   11.25
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   TlBAs
_chemical_formula_sum   'Tl3 B3 As3'
_cell_volume   205.71
_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  0.75  1.0
  B  B1  3  0.0  0.0  0.0  1.0
  As  As2  3  0.0  0.0  0.38  1.0

Tl B As
Tl B As 0 1 o o o 0 1 o o + 0 1 + o o 0 1 o + o 0 2 - o o 0 2 o - o 0 2 o o - 1 2 - - o 1 2 - o - 1 2 o - - 
TlBAs crystallizes in the trigonal R3m space group. Tl(1) is bonded to four equivalent B(1) and three equivalent As(1) atoms to form a mixture of distorted edge and corner-sharing TlB4As3 hexagonal pyramids. There is one shorter (2.80 Å) and three longer (2.82 Å) Tl(1)-B(1) bond lengths. All Tl(1)-As(1) bond lengths are 2.69 Å. B(1) is bonded in a 7-coordinate geometry to four equivalent Tl(1) and three equivalent As(1) atoms. All B(1)-As(1) bond lengths are 2.69 Å. As(1) is bonded in a distorted hexagonal planar geometry to three equivalent Tl(1) and three equivalent B(1) atoms.