data_Hf2CoGe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.84
_cell_length_b   4.84
_cell_length_c   4.84
_cell_angle_alpha   128.33
_cell_angle_beta   128.33
_cell_angle_gamma   76.1
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Hf2CoGe
_chemical_formula_sum   'Hf2 Co1 Ge1'
_cell_volume   67.98
_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  Hf2  1  0.0  0.11  0.91  1.0
  Hf  Hf3  1  0.11  0.0  0.91  1.0
  Co  Co0  1  0.0  0.0  0.0  1.0
  Ge  Ge1  1  0.0  0.0  0.81  1.0

data_Hf2CoGe
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.97
_cell_length_b   5.97
_cell_length_c   4.84
_cell_angle_alpha   90.0
_cell_angle_beta   128.05
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Hf2CoGe
_chemical_formula_sum   'Hf4 Co2 Ge2'
_cell_volume   135.96
_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  4  0.44  0.44  0.8  1.0
  Co  Co1  2  0.0  0.0  0.0  1.0
  Ge  Ge2  2  0.0  0.0  0.81  1.0

Hf Hf Co Ge
Hf2CoGe is Copper structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Hf2CoGe clusters. Hf(1) is bonded in a single-bond geometry to one Co(1) and one Ge(1) atom. The Hf(1)-Co(1) bond length is 0.89 Å. The Hf(1)-Ge(1) bond length is 0.44 Å. Co(1) is bonded in a 2-coordinate geometry to two equivalent Hf(1) atoms. Ge(1) is bonded in a water-like geometry to two equivalent Hf(1) atoms.