data_Sr2Hf
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.73
_cell_length_b   8.73
_cell_length_c   8.73
_cell_angle_alpha   155.82
_cell_angle_beta   155.82
_cell_angle_gamma   34.46
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr2Hf
_chemical_formula_sum   'Sr2 Hf1'
_cell_volume   111.44
_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
  Sr  Sr1  1  0.0  0.0  0.88  1.0
  Sr  Sr2  1  0.0  0.0  0.79  1.0
  Hf  Hf0  1  0.0  0.0  0.0  1.0

data_Sr2Hf
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.17
_cell_length_b   5.17
_cell_length_c   8.73
_cell_angle_alpha   90.0
_cell_angle_beta   107.23
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Sr2Hf
_chemical_formula_sum   'Sr4 Hf2'
_cell_volume   222.88
_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
  Sr  Sr0  2  0.29  0.5  0.79  1.0
  Sr  Sr1  2  0.38  0.5  0.88  1.0
  Hf  Hf2  2  0.0  0.0  0.0  1.0

Sr Sr Hf
Sr2Hf is Cyanogen Chloride-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Sr2Hf clusters. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a linear geometry to one Sr(2) and one Hf(1) atom. The Sr(1)-Sr(2) bond length is 0.77 Å. The Sr(1)-Hf(1) bond length is 1.05 Å. In the second Sr site, Sr(2) is bonded in a single-bond geometry to one Sr(1) atom. Hf(1) is bonded in a single-bond geometry to one Sr(1) atom.