data_FeGe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.63
_cell_length_b   4.63
_cell_length_c   4.63
_cell_angle_alpha   140.03
_cell_angle_beta   138.25
_cell_angle_gamma   59.18
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeGe2
_chemical_formula_sum   'Fe1 Ge2'
_cell_volume   41.94
_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
  Fe  Fe0  1  0.0  0.0  0.0  1.0
  Ge  Ge1  1  0.0  0.0  0.29  1.0
  Ge  Ge2  1  0.0  0.0  0.76  1.0

data_FeGe2
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.16
_cell_length_b   3.3
_cell_length_c   4.63
_cell_angle_alpha   110.88
_cell_angle_beta   109.99
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeGe2
_chemical_formula_sum   'Fe1 Ge2'
_cell_volume   41.94
_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
  Fe  Fe0  1  0.0  0.0  0.0  1.0
  Ge  Ge1  1  0.0  0.29  0.29  1.0
  Ge  Ge2  1  0.0  0.76  0.76  1.0

Fe Ge Ge
FeGe2 crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one FeGe2 cluster. Fe(1) is bonded in a linear geometry to one Ge(1) and one Ge(2) atom. The Fe(1)-Ge(1) bond length is 1.34 Å. The Fe(1)-Ge(2) bond length is 1.13 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a single-bond geometry to one Fe(1) atom. In the second Ge site, Ge(2) is bonded in a single-bond geometry to one Fe(1) atom.