The crystal structure described by Er9(FeGe)10 crystallizes in the orthorhombic Immm space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded in a 7-coordinate geometry to four equivalent Fe(1), one Ge(3), one Ge(4), two equivalent Ge(1), and three equivalent Ge(2) atoms. In the second Er site, Er(2) is bonded in a 11-coordinate geometry to one Fe(2), four equivalent Fe(1), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(3) atoms. In the third Er site, Er(3) is bonded in a 10-coordinate geometry to four equivalent Fe(1), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(4) atoms. In the fourth Er site, Er(4) is bonded in a 14-coordinate geometry to four equivalent Fe(2), eight equivalent Fe(1), and two equivalent Ge(3) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Er(2), one Er(3), one Er(4), two equivalent Er(1), one Fe(2), two equivalent Fe(1), one Ge(3), one Ge(4), and two equivalent Ge(2) atoms. In the second Fe site, Fe(2) is bonded in a 10-coordinate geometry to one Er(2), two equivalent Er(4), one Fe(2), four equivalent Fe(1), and two equivalent Ge(4) atoms. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to two equivalent Er(2), two equivalent Er(3), four equivalent Er(1), and two equivalent Ge(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Er(2), one Er(3), three equivalent Er(1), and four equivalent Fe(1) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Er(4), two equivalent Er(1), two equivalent Er(2), and four equivalent Fe(1) atoms. In the fourth Ge site, Ge(4) is bonded in a 10-coordinate geometry to two equivalent Er(1), two equivalent Er(3), two equivalent Fe(2), and four equivalent Fe(1) atoms. is represented by the CIF card [CIF]
data_Er9(FeGe)10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.352
_cell_length_b   10.054
_cell_length_c   10.054
_cell_angle_alpha   83.031
_cell_angle_beta   74.563
_cell_angle_gamma   74.563
_symmetry_Int_Tables_number   1
_cell_volume   501.985
_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
  Er  Er0  1  0.636  0.716  0.011  1.0
  Er  Er1  1  0.364  0.284  0.989  1.0
  Er  Er2  1  0.364  0.989  0.284  1.0
  Er  Er3  1  0.636  0.011  0.716  1.0
  Er  Er4  1  0.198  0.802  0.802  1.0
  Er  Er5  1  0.802  0.198  0.198  1.0
  Er  Er6  1  0.000  0.781  0.219  1.0
  Er  Er7  1  0.000  0.219  0.781  1.0
  Er  Er8  1  0.000  0.500  0.500  1.0
  Fe  Fe9  1  0.101  0.510  0.798  1.0
  Fe  Fe10  1  0.409  0.490  0.202  1.0
  Fe  Fe11  1  0.899  0.202  0.490  1.0
  Fe  Fe12  1  0.591  0.798  0.510  1.0
  Fe  Fe13  1  0.899  0.490  0.202  1.0
  Fe  Fe14  1  0.591  0.510  0.798  1.0
  Fe  Fe15  1  0.101  0.798  0.510  1.0
  Fe  Fe16  1  0.409  0.202  0.490  1.0
  Fe  Fe17  1  0.407  0.593  0.593  1.0
  Fe  Fe18  1  0.593  0.407  0.407  1.0
  Ge  Ge19  1  0.749  0.000  0.000  1.0
  Ge  Ge20  1  0.251  0.000  0.000  1.0
  Ge  Ge21  1  0.205  0.583  0.006  1.0
  Ge  Ge22  1  0.795  0.417  0.994  1.0
  Ge  Ge23  1  0.795  0.994  0.417  1.0
  Ge  Ge24  1  0.205  0.006  0.583  1.0
  Ge  Ge25  1  0.792  0.708  0.708  1.0
  Ge  Ge26  1  0.208  0.292  0.292  1.0
  Ge  Ge27  1  0.500  0.673  0.327  1.0
  Ge  Ge28  1  0.500  0.327  0.673  1.0
[/CIF]
.
The crystal structure described by Er9(FeGe)10 crystallizes in the orthorhombic Immm space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded in a 7-coordinate geometry to four equivalent Fe(1), one Ge(3), one Ge(4), two equivalent Ge(1), and three equivalent Ge(2) atoms. In the second Er site, Er(2) is bonded in a 11-coordinate geometry to one Fe(2), four equivalent Fe(1), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(3) atoms. In the third Er site, Er(3) is bonded in a 10-coordinate geometry to four equivalent Fe(1), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(4) atoms. In the fourth Er site, Er(4) is bonded in a 14-coordinate geometry to four equivalent Fe(2), eight equivalent Fe(1), and two equivalent Ge(3) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Er(2), one Er(3), one Er(4), two equivalent Er(1), one Fe(2), two equivalent Fe(1), one Ge(3), one Ge(4), and two equivalent Ge(2) atoms. In the second Fe site, Fe(2) is bonded in a 10-coordinate geometry to one Er(2), two equivalent Er(4), one Fe(2), four equivalent Fe(1), and two equivalent Ge(4) atoms. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to two equivalent Er(2), two equivalent Er(3), four equivalent Er(1), and two equivalent Ge(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Er(2), one Er(3), three equivalent Er(1), and four equivalent Fe(1) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Er(4), two equivalent Er(1), two equivalent Er(2), and four equivalent Fe(1) atoms. In the fourth Ge site, Ge(4) is bonded in a 10-coordinate geometry to two equivalent Er(1), two equivalent Er(3), two equivalent Fe(2), and four equivalent Fe(1) atoms. is represented by the CIF card [CIF]
data_Er9(FeGe)10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.352
_cell_length_b   10.054
_cell_length_c   10.054
_cell_angle_alpha   83.031
_cell_angle_beta   74.563
_cell_angle_gamma   74.563
_symmetry_Int_Tables_number   1
_cell_volume   501.985
_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
  Er  Er0  1  0.636  0.716  0.011  1.0
  Er  Er1  1  0.364  0.284  0.989  1.0
  Er  Er2  1  0.364  0.989  0.284  1.0
  Er  Er3  1  0.636  0.011  0.716  1.0
  Er  Er4  1  0.198  0.802  0.802  1.0
  Er  Er5  1  0.802  0.198  0.198  1.0
  Er  Er6  1  0.000  0.781  0.219  1.0
  Er  Er7  1  0.000  0.219  0.781  1.0
  Er  Er8  1  0.000  0.500  0.500  1.0
  Fe  Fe9  1  0.101  0.510  0.798  1.0
  Fe  Fe10  1  0.409  0.490  0.202  1.0
  Fe  Fe11  1  0.899  0.202  0.490  1.0
  Fe  Fe12  1  0.591  0.798  0.510  1.0
  Fe  Fe13  1  0.899  0.490  0.202  1.0
  Fe  Fe14  1  0.591  0.510  0.798  1.0
  Fe  Fe15  1  0.101  0.798  0.510  1.0
  Fe  Fe16  1  0.409  0.202  0.490  1.0
  Fe  Fe17  1  0.407  0.593  0.593  1.0
  Fe  Fe18  1  0.593  0.407  0.407  1.0
  Ge  Ge19  1  0.749  0.000  0.000  1.0
  Ge  Ge20  1  0.251  0.000  0.000  1.0
  Ge  Ge21  1  0.205  0.583  0.006  1.0
  Ge  Ge22  1  0.795  0.417  0.994  1.0
  Ge  Ge23  1  0.795  0.994  0.417  1.0
  Ge  Ge24  1  0.205  0.006  0.583  1.0
  Ge  Ge25  1  0.792  0.708  0.708  1.0
  Ge  Ge26  1  0.208  0.292  0.292  1.0
  Ge  Ge27  1  0.500  0.673  0.327  1.0
  Ge  Ge28  1  0.500  0.327  0.673  1.0
[/CIF]
.