The material described by ErFe6Ge6 crystallizes in the orthorhombic Immm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to four equivalent Fe(2), four equivalent Fe(3), four equivalent Fe(4), one Ge(1), one Ge(6), two equivalent Ge(3), two equivalent Ge(5), and two equivalent Ge(8) atoms to form distorted ErFe12Ge8 hexagonal bipyramids that share corners with four equivalent Er(1)Fe12Ge8 hexagonal bipyramids, faces with eight equivalent Fe(2)Er2Fe4Ge6 cuboctahedra, faces with two equivalent Er(1)Fe12Ge8 hexagonal bipyramids, and faces with two equivalent Er(2)Fe12Ge8 hexagonal bipyramids. In the second Er site, Er(2) is bonded to four equivalent Fe(1), eight equivalent Fe(4), two equivalent Ge(3), two equivalent Ge(7), and four equivalent Ge(1) atoms to form distorted face-sharing ErFe12Ge8 hexagonal bipyramids. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to two equivalent Er(2), four equivalent Fe(4), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(7) atoms. In the second Fe site, Fe(2) is bonded to two equivalent Er(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Ge(5), two equivalent Ge(6), and two equivalent Ge(8) atoms to form distorted FeEr2Fe4Ge6 cuboctahedra that share corners with four equivalent Fe(2)Er2Fe4Ge6 cuboctahedra, edges with two equivalent Fe(2)Er2Fe4Ge6 cuboctahedra, faces with four equivalent Fe(2)Er2Fe4Ge6 cuboctahedra, and faces with four equivalent Er(1)Fe12Ge8 hexagonal bipyramids. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to two equivalent Er(1), two equivalent Fe(2), two equivalent Fe(4), one Ge(3), one Ge(4), one Ge(5), one Ge(6), and two equivalent Ge(8) atoms. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Er(1), one Er(2), one Fe(1), one Fe(3), two equivalent Fe(4), one Ge(1), one Ge(2), one Ge(3), one Ge(4), one Ge(7), and one Ge(8) atom. There are eight inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Er(1), two equivalent Er(2), two equivalent Fe(1), and four equivalent Fe(4) atoms. In the second Ge site, Ge(2) is bonded in a 6-coordinate geometry to two equivalent Fe(1) and four equivalent Fe(4) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Er(2), two equivalent Er(1), two equivalent Fe(3), and four equivalent Fe(4) atoms. In the fourth Ge site, Ge(4) is bonded in a 6-coordinate geometry to two equivalent Fe(3) and four equivalent Fe(4) atoms. In the fifth Ge site, Ge(5) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Fe(3), and four equivalent Fe(2) atoms. In the sixth Ge site, Ge(6) is bonded in a 7-coordinate geometry to one Er(1), two equivalent Fe(3), and four equivalent Fe(2) atoms. In the seventh Ge site, Ge(7) is bonded in a 8-coordinate geometry to one Er(2), two equivalent Fe(1), four equivalent Fe(4), and one Ge(7) atom. In the eighth Ge site, Ge(8) is bonded in a 8-coordinate geometry to one Er(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and one Ge(8) atom. is represented by the CIF file [CIF]
data_Er(FeGe)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.105
_cell_length_b   8.112
_cell_length_c   14.084
_cell_angle_alpha   106.738
_cell_angle_beta   100.442
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   548.407
_cell_formula_units_Z   3
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  0.667  0.167  0.335  1.0
  Er  Er1  1  0.333  0.833  0.665  1.0
  Er  Er2  1  0.000  0.000  0.000  1.0
  Fe  Fe3  1  0.500  0.249  0.000  1.0
  Fe  Fe4  1  0.500  0.751  0.000  1.0
  Fe  Fe5  1  0.000  0.500  0.500  1.0
  Fe  Fe6  1  0.000  0.000  0.500  1.0
  Fe  Fe7  1  0.500  0.000  0.500  1.0
  Fe  Fe8  1  0.500  0.500  0.500  1.0
  Fe  Fe9  1  0.833  0.582  0.667  1.0
  Fe  Fe10  1  0.167  0.915  0.333  1.0
  Fe  Fe11  1  0.833  0.085  0.667  1.0
  Fe  Fe12  1  0.167  0.418  0.333  1.0
  Fe  Fe13  1  0.833  0.332  0.166  1.0
  Fe  Fe14  1  0.167  0.165  0.834  1.0
  Fe  Fe15  1  0.333  0.835  0.166  1.0
  Fe  Fe16  1  0.667  0.668  0.834  1.0
  Fe  Fe17  1  0.167  0.668  0.834  1.0
  Fe  Fe18  1  0.833  0.835  0.166  1.0
  Fe  Fe19  1  0.667  0.165  0.834  1.0
  Fe  Fe20  1  0.333  0.332  0.166  1.0
  Ge  Ge21  1  0.556  0.056  0.111  1.0
  Ge  Ge22  1  0.444  0.944  0.889  1.0
  Ge  Ge23  1  0.556  0.556  0.111  1.0
  Ge  Ge24  1  0.444  0.444  0.889  1.0
  Ge  Ge25  1  0.112  0.112  0.224  1.0
  Ge  Ge26  1  0.888  0.888  0.776  1.0
  Ge  Ge27  1  0.111  0.611  0.221  1.0
  Ge  Ge28  1  0.889  0.389  0.779  1.0
  Ge  Ge29  1  0.223  0.223  0.445  1.0
  Ge  Ge30  1  0.777  0.777  0.555  1.0
  Ge  Ge31  1  0.221  0.721  0.442  1.0
  Ge  Ge32  1  0.779  0.279  0.558  1.0
  Ge  Ge33  1  0.000  0.346  0.000  1.0
  Ge  Ge34  1  0.000  0.654  0.000  1.0
  Ge  Ge35  1  0.667  0.513  0.333  1.0
  Ge  Ge36  1  0.333  0.180  0.667  1.0
  Ge  Ge37  1  0.667  0.820  0.333  1.0
  Ge  Ge38  1  0.333  0.487  0.667  1.0
[/CIF]
.
The material described by ErFe6Ge6 crystallizes in the orthorhombic Immm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to four equivalent Fe(2), four equivalent Fe(3), four equivalent Fe(4), one Ge(1), one Ge(6), two equivalent Ge(3), two equivalent Ge(5), and two equivalent Ge(8) atoms to form distorted ErFe12Ge8 hexagonal bipyramids that share corners with four equivalent Er(1)Fe12Ge8 hexagonal bipyramids, faces with eight equivalent Fe(2)Er2Fe4Ge6 cuboctahedra, faces with two equivalent Er(1)Fe12Ge8 hexagonal bipyramids, and faces with two equivalent Er(2)Fe12Ge8 hexagonal bipyramids. In the second Er site, Er(2) is bonded to four equivalent Fe(1), eight equivalent Fe(4), two equivalent Ge(3), two equivalent Ge(7), and four equivalent Ge(1) atoms to form distorted face-sharing ErFe12Ge8 hexagonal bipyramids. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to two equivalent Er(2), four equivalent Fe(4), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(7) atoms. In the second Fe site, Fe(2) is bonded to two equivalent Er(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Ge(5), two equivalent Ge(6), and two equivalent Ge(8) atoms to form distorted FeEr2Fe4Ge6 cuboctahedra that share corners with four equivalent Fe(2)Er2Fe4Ge6 cuboctahedra, edges with two equivalent Fe(2)Er2Fe4Ge6 cuboctahedra, faces with four equivalent Fe(2)Er2Fe4Ge6 cuboctahedra, and faces with four equivalent Er(1)Fe12Ge8 hexagonal bipyramids. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to two equivalent Er(1), two equivalent Fe(2), two equivalent Fe(4), one Ge(3), one Ge(4), one Ge(5), one Ge(6), and two equivalent Ge(8) atoms. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Er(1), one Er(2), one Fe(1), one Fe(3), two equivalent Fe(4), one Ge(1), one Ge(2), one Ge(3), one Ge(4), one Ge(7), and one Ge(8) atom. There are eight inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Er(1), two equivalent Er(2), two equivalent Fe(1), and four equivalent Fe(4) atoms. In the second Ge site, Ge(2) is bonded in a 6-coordinate geometry to two equivalent Fe(1) and four equivalent Fe(4) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Er(2), two equivalent Er(1), two equivalent Fe(3), and four equivalent Fe(4) atoms. In the fourth Ge site, Ge(4) is bonded in a 6-coordinate geometry to two equivalent Fe(3) and four equivalent Fe(4) atoms. In the fifth Ge site, Ge(5) is bonded in a 8-coordinate geometry to two equivalent Er(1), two equivalent Fe(3), and four equivalent Fe(2) atoms. In the sixth Ge site, Ge(6) is bonded in a 7-coordinate geometry to one Er(1), two equivalent Fe(3), and four equivalent Fe(2) atoms. In the seventh Ge site, Ge(7) is bonded in a 8-coordinate geometry to one Er(2), two equivalent Fe(1), four equivalent Fe(4), and one Ge(7) atom. In the eighth Ge site, Ge(8) is bonded in a 8-coordinate geometry to one Er(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and one Ge(8) atom. is represented by the CIF file [CIF]
data_Er(FeGe)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.105
_cell_length_b   8.112
_cell_length_c   14.084
_cell_angle_alpha   106.738
_cell_angle_beta   100.442
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   548.407
_cell_formula_units_Z   3
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  0.667  0.167  0.335  1.0
  Er  Er1  1  0.333  0.833  0.665  1.0
  Er  Er2  1  0.000  0.000  0.000  1.0
  Fe  Fe3  1  0.500  0.249  0.000  1.0
  Fe  Fe4  1  0.500  0.751  0.000  1.0
  Fe  Fe5  1  0.000  0.500  0.500  1.0
  Fe  Fe6  1  0.000  0.000  0.500  1.0
  Fe  Fe7  1  0.500  0.000  0.500  1.0
  Fe  Fe8  1  0.500  0.500  0.500  1.0
  Fe  Fe9  1  0.833  0.582  0.667  1.0
  Fe  Fe10  1  0.167  0.915  0.333  1.0
  Fe  Fe11  1  0.833  0.085  0.667  1.0
  Fe  Fe12  1  0.167  0.418  0.333  1.0
  Fe  Fe13  1  0.833  0.332  0.166  1.0
  Fe  Fe14  1  0.167  0.165  0.834  1.0
  Fe  Fe15  1  0.333  0.835  0.166  1.0
  Fe  Fe16  1  0.667  0.668  0.834  1.0
  Fe  Fe17  1  0.167  0.668  0.834  1.0
  Fe  Fe18  1  0.833  0.835  0.166  1.0
  Fe  Fe19  1  0.667  0.165  0.834  1.0
  Fe  Fe20  1  0.333  0.332  0.166  1.0
  Ge  Ge21  1  0.556  0.056  0.111  1.0
  Ge  Ge22  1  0.444  0.944  0.889  1.0
  Ge  Ge23  1  0.556  0.556  0.111  1.0
  Ge  Ge24  1  0.444  0.444  0.889  1.0
  Ge  Ge25  1  0.112  0.112  0.224  1.0
  Ge  Ge26  1  0.888  0.888  0.776  1.0
  Ge  Ge27  1  0.111  0.611  0.221  1.0
  Ge  Ge28  1  0.889  0.389  0.779  1.0
  Ge  Ge29  1  0.223  0.223  0.445  1.0
  Ge  Ge30  1  0.777  0.777  0.555  1.0
  Ge  Ge31  1  0.221  0.721  0.442  1.0
  Ge  Ge32  1  0.779  0.279  0.558  1.0
  Ge  Ge33  1  0.000  0.346  0.000  1.0
  Ge  Ge34  1  0.000  0.654  0.000  1.0
  Ge  Ge35  1  0.667  0.513  0.333  1.0
  Ge  Ge36  1  0.333  0.180  0.667  1.0
  Ge  Ge37  1  0.667  0.820  0.333  1.0
  Ge  Ge38  1  0.333  0.487  0.667  1.0
[/CIF]
.