data_TiCuB2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.83
_cell_length_b   3.83
_cell_length_c   3.83
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TiCuB2
_chemical_formula_sum   'Ti1 Cu1 B2'
_cell_volume   39.59
_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
  Ti  Ti3  1  0.0  0.0  0.0  1.0
  Cu  Cu2  1  0.71  0.71  0.71  1.0
  B  B0  1  0.35  0.35  0.35  1.0
  B  B1  1  0.06  0.06  0.06  1.0

data_TiCuB2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   3.83
_cell_length_b   3.83
_cell_length_c   9.37
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   TiCuB2
_chemical_formula_sum   'Ti3 Cu3 B6'
_cell_volume   118.76
_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
  Ti  Ti0  3  0.0  0.0  0.0  1.0
  Cu  Cu1  3  0.0  0.0  0.29  1.0
  B  B2  3  0.0  0.0  0.65  1.0
  B  B3  3  0.0  0.0  0.94  1.0

Ti Cu B B
CuTiB2 crystallizes in the trigonal R3m space group. Ti(1) is bonded in a single-bond geometry to four equivalent Cu(1), one B(2), and three equivalent B(1) atoms. There are three shorter (2.24 Å) and one longer (2.76 Å) Ti(1)-Cu(1) bond length. The Ti(1)-B(2) bond length is 0.54 Å. All Ti(1)-B(1) bond lengths are 2.22 Å. Cu(1) is bonded in a distorted q6 geometry to four equivalent Ti(1), three equivalent B(1), and three equivalent B(2) atoms. All Cu(1)-B(1) bond lengths are 2.22 Å. All Cu(1)-B(2) bond lengths are 2.22 Å. There are two inequivalent B sites. In the first B site, B(1) is bonded in a distorted hexagonal planar geometry to three equivalent Ti(1) and three equivalent Cu(1) atoms. In the second B site, B(2) is bonded in a single-bond geometry to one Ti(1) and three equivalent Cu(1) atoms.