data_Er(Fe2Ge)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.11
_cell_length_b   7.3
_cell_length_c   3.86
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Er(Fe2Ge)2
_chemical_formula_sum   'Er2 Fe8 Ge4'
_cell_volume   200.41
_cell_formula_units_Z   2
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
  Er  Er0  1  0.56  0.65  0.93  1.0
  Er  Er1  1  0.0  0.0  0.0  1.0
  Fe  Fe2  1  0.94  0.06  0.0  1.0
  Fe  Fe3  1  0.09  0.34  0.0  1.0
  Fe  Fe4  1  0.62  0.71  0.93  1.0
  Fe  Fe5  1  0.18  0.23  0.0  1.0
  Fe  Fe6  1  0.58  0.69  0.93  1.0
  Fe  Fe7  1  0.49  0.58  0.93  1.0
  Fe  Fe8  1  0.02  0.96  0.0  1.0
  Fe  Fe9  1  0.54  0.6  0.93  1.0
  Ge  Ge10  1  0.57  0.54  0.93  1.0
  Ge  Ge11  1  0.55  0.75  0.93  1.0
  Ge  Ge12  1  0.12  0.11  0.0  1.0
  Ge  Ge13  1  0.99  0.19  0.0  1.0

data_Er(Fe2Ge)2
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.86
_cell_length_b   7.11
_cell_length_c   7.3
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Er(Fe2Ge)2
_chemical_formula_sum   'Er2 Fe8 Ge4'
_cell_volume   200.41
_cell_formula_units_Z   2
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
  Er  Er0  1  0.0  0.0  0.0  1.0
  Er  Er1  1  0.93  0.56  0.65  1.0
  Fe  Fe2  1  0.0  0.94  0.06  1.0
  Fe  Fe3  1  0.0  0.18  0.23  1.0
  Fe  Fe4  1  0.0  0.09  0.34  1.0
  Fe  Fe5  1  0.0  0.02  0.96  1.0
  Fe  Fe6  1  0.93  0.49  0.58  1.0
  Fe  Fe7  1  0.93  0.54  0.6  1.0
  Fe  Fe8  1  0.93  0.58  0.69  1.0
  Fe  Fe9  1  0.93  0.62  0.71  1.0
  Ge  Ge10  1  0.0  0.12  0.11  1.0
  Ge  Ge11  1  0.0  0.99  0.19  1.0
  Ge  Ge12  1  0.93  0.55  0.75  1.0
  Ge  Ge13  1  0.93  0.57  0.54  1.0

Er Er Fe Fe Fe Fe Fe Fe Fe Fe Ge Ge Ge Ge
Er Er Fe Fe Fe Fe Fe Fe Fe Fe Ge Ge Ge Ge 0 9 o o o 0 6 o o o 1 8 o - o 1 2 - o o 1 12 o o o 2 13 o o o 3 5 o o o 4 6 o o o 4 11 o o o 5 12 o o o 6 11 o o o 7 9 o o o 7 10 o o o 9 10 o o o 12 13 - o o 
ErFe4Ge2 crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of two ErFe4Ge2 clusters. In one of the ErFe4Ge2 clusters, Er(1) is bonded in a linear geometry to two equivalent Fe(5,8) atoms. Both Er(1)-Fe(5,8) bond lengths are 0.36 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(3,6) is bonded in a single-bond geometry to one Fe(5,8) atom. The Fe(3,6)-Fe(5,8) bond length is 0.32 Å. In the second Fe site, Fe(5,8) is bonded in a 3-coordinate geometry to one Er(1); one Fe(3,6); and one Ge(1,2) atom. The Fe(5,8)-Ge(1,2) bond length is 0.51 Å. Ge(1,2) is bonded in a single-bond geometry to one Fe(5,8) atom. In one of the ErFe4Ge2 clusters, Er(2) is bonded in a 3-coordinate geometry to one Fe(1), one Fe(7), and one Ge(3) atom. The Er(2)-Fe(1) bond length is 0.64 Å. The Er(2)-Fe(7) bond length is 0.36 Å. The Er(2)-Ge(3) bond length is 1.18 Å. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a distorted single-bond geometry to one Er(2) and one Ge(4) atom. The Fe(1)-Ge(4) bond length is 0.99 Å. In the second Fe site, Fe(2) is bonded in a 2-coordinate geometry to one Fe(4) and one Ge(4) atom. The Fe(2)-Fe(4) bond length is 0.99 Å. The Fe(2)-Ge(4) bond length is 1.32 Å. In the third Fe site, Fe(4) is bonded in a 3-coordinate geometry to one Fe(2), one Ge(3), and one Ge(4) atom. The Fe(4)-Ge(3) bond length is 0.99 Å. The Fe(4)-Ge(4) bond length is 1.37 Å. In the fourth Fe site, Fe(7) is bonded in a single-bond geometry to one Er(2) atom. There are two inequivalent Ge sites. In the first Ge site, Ge(3) is bonded in a 3-coordinate geometry to one Er(2), one Fe(4), and one Ge(4) atom. The Ge(3)-Ge(4) bond length is 1.13 Å. In the second Ge site, Ge(4) is bonded in a 4-coordinate geometry to one Fe(1), one Fe(2), one Fe(4), and one Ge(3) atom.