data_HfCoSi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.26
_cell_length_b   8.26
_cell_length_c   8.26
_cell_angle_alpha   20.16
_cell_angle_beta   20.16
_cell_angle_gamma   20.16
_symmetry_Int_Tables_number   1
_chemical_formula_structural   HfCoSi2
_chemical_formula_sum   'Hf1 Co1 Si2'
_cell_volume   58.51
_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  0.0  0.0  0.13  1.0
  Co  Co0  1  0.0  0.0  0.0  1.0
  Si  Si2  1  0.0  0.0  0.87  1.0
  Si  Si3  1  0.0  0.0  0.39  1.0

data_HfCoSi2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.01
_cell_length_b   2.89
_cell_length_c   8.26
_cell_angle_alpha   90.0
_cell_angle_beta   101.66
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   HfCoSi2
_chemical_formula_sum   'Hf2 Co2 Si4'
_cell_volume   117.02
_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  -0.0  0.0  0.87  1.0
  Co  Co1  2  0.0  0.0  0.0  1.0
  Si  Si2  2  0.0  0.0  0.13  1.0
  Si  Si3  2  0.0  0.0  0.61  1.0

Hf Co Si Si
HfCoSi2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two HfCoSi2 clusters. Hf(1) is bonded in a distorted single-bond geometry to one Co(1) and one Si(2) atom. The Hf(1)-Co(1) bond length is 1.07 Å. The Hf(1)-Si(2) bond length is 2.14 Å. Co(1) is bonded in a distorted linear geometry to one Hf(1) and one Si(1) atom. The Co(1)-Si(1) bond length is 1.07 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a single-bond geometry to one Co(1) atom. In the second Si site, Si(2) is bonded in a single-bond geometry to one Hf(1) atom.