data_HfAlTc2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.4
_cell_length_b   4.4
_cell_length_c   3.28
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HfAlTc2
_chemical_formula_sum   'Hf1 Al1 Tc2'
_cell_volume   63.5
_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
  Hf  Hf1  1  0.2  0.2  0.0  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0
  Tc  Tc2  1  0.2  0.0  0.64  1.0
  Tc  Tc3  1  0.0  0.2  0.64  1.0

data_HfAlTc2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.22
_cell_length_b   6.22
_cell_length_c   3.28
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   HfAlTc2
_chemical_formula_sum   'Hf2 Al2 Tc4'
_cell_volume   126.99
_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
  Hf  Hf0  2  0.2  0.0  0.0  1.0
  Al  Al1  2  0.0  0.0  0.0  1.0
  Tc  Tc2  4  0.1  0.1  0.64  1.0

Hf Al Tc Tc
HfTc2Al crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two HfTc2Al clusters. Hf(1) is bonded in a 1-coordinate geometry to two equivalent Tc(1) and one Al(1) atom. Both Hf(1)-Tc(1) bond lengths are 1.46 Å. The Hf(1)-Al(1) bond length is 1.23 Å. Tc(1) is bonded in a 3-coordinate geometry to one Hf(1), one Tc(1), and one Al(1) atom. The Tc(1)-Tc(1) bond length is 1.23 Å. The Tc(1)-Al(1) bond length is 1.46 Å. Al(1) is bonded in a distorted single-bond geometry to one Hf(1) and two equivalent Tc(1) atoms.