data_Hf2NiAg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.72
_cell_length_b   4.72
_cell_length_c   4.72
_cell_angle_alpha   121.65
_cell_angle_beta   121.65
_cell_angle_gamma   87.16
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Hf2NiAg
_chemical_formula_sum   'Hf2 Ni1 Ag1'
_cell_volume   72.39
_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  0.3  0.71  1.0
  Hf  Hf2  1  0.3  0.0  0.71  1.0
  Ni  Ni3  1  0.0  0.0  0.0  1.0
  Ag  Ag0  1  0.0  0.0  0.42  1.0

data_Hf2NiAg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.51
_cell_length_b   6.51
_cell_length_c   4.72
_cell_angle_alpha   90.0
_cell_angle_beta   133.58
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Hf2NiAg
_chemical_formula_sum   'Hf4 Ni2 Ag2'
_cell_volume   144.78
_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  0.35  0.35  0.41  1.0
  Ni  Ni1  2  0.0  0.0  0.0  1.0
  Ag  Ag2  2  0.0  0.0  0.42  1.0

Hf Hf Ni Ag
Hf2NiAg crystallizes in the monoclinic Cm space group. Hf(1) is bonded in a distorted single-bond geometry to two equivalent Ni(1) and one Ag(1) atom. There is one shorter (2.44 Å) and one longer (2.83 Å) Hf(1)-Ni(1) bond length. The Hf(1)-Ag(1) bond length is 1.36 Å. Ni(1) is bonded in a 5-coordinate geometry to four equivalent Hf(1) and one Ag(1) atom. The Ni(1)-Ag(1) bond length is 1.98 Å. Ag(1) is bonded in a distorted L-shaped geometry to two equivalent Hf(1) and one Ni(1) atom.