The material described by Er3NdFe34 crystallizes in the hexagonal P-6m2 space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 20-coordinate geometry to two equivalent Fe(6), six equivalent Fe(2), six equivalent Fe(3), and six equivalent Fe(7) atoms. In the second Er site, Er(2) is bonded in a 18-coordinate geometry to six equivalent Fe(1), six equivalent Fe(2), and six equivalent Fe(3) atoms. In the third Er site, Er(3) is bonded in a 18-coordinate geometry to six equivalent Fe(1), six equivalent Fe(2), and six equivalent Fe(4) atoms. Nd(1) is bonded in a 20-coordinate geometry to two equivalent Fe(5), six equivalent Fe(1), six equivalent Fe(4), and six equivalent Fe(7) atoms. There are seven inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one Er(2), one Er(3), one Nd(1), one Fe(5), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and two equivalent Fe(7) atoms to form distorted FeNdEr2Fe9 cuboctahedra that share corners with four equivalent Fe(2)Er3Fe9 cuboctahedra, corners with five equivalent Fe(7)NdErFe10 cuboctahedra, corners with six equivalent Fe(1)NdEr2Fe9 cuboctahedra, edges with three equivalent Fe(7)NdErFe10 cuboctahedra, edges with five equivalent Fe(2)Er3Fe9 cuboctahedra, faces with two equivalent Fe(2)Er3Fe9 cuboctahedra, faces with two equivalent Fe(7)NdErFe10 cuboctahedra, and faces with six equivalent Fe(1)NdEr2Fe9 cuboctahedra. In the second Fe site, Fe(7) is bonded to one Er(1), one Nd(1), one Fe(5), one Fe(6), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(4) atoms to form FeNdErFe10 cuboctahedra that share corners with four equivalent Fe(7)NdErFe10 cuboctahedra, corners with five equivalent Fe(2)Er3Fe9 cuboctahedra, corners with five equivalent Fe(1)NdEr2Fe9 cuboctahedra, edges with three equivalent Fe(2)Er3Fe9 cuboctahedra, edges with three equivalent Fe(1)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(2)Er3Fe9 cuboctahedra, faces with two equivalent Fe(1)NdEr2Fe9 cuboctahedra, and faces with six equivalent Fe(7)NdErFe10 cuboctahedra. In the third Fe site, Fe(2) is bonded to one Er(1), one Er(2), one Er(3), one Fe(6), two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(4), and two equivalent Fe(7) atoms to form distorted FeEr3Fe9 cuboctahedra that share corners with four equivalent Fe(1)NdEr2Fe9 cuboctahedra, corners with five equivalent Fe(7)NdErFe10 cuboctahedra, corners with six equivalent Fe(2)Er3Fe9 cuboctahedra, edges with three equivalent Fe(7)NdErFe10 cuboctahedra, edges with five equivalent Fe(1)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(1)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(7)NdErFe10 cuboctahedra, and faces with six equivalent Fe(2)Er3Fe9 cuboctahedra. In the fourth Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Er(1), one Er(2), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(5), and two equivalent Fe(7) atoms. In the fifth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Er(3), one Nd(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(4), two equivalent Fe(6), and two equivalent Fe(7) atoms. In the sixth Fe site, Fe(5) is bonded in a 14-coordinate geometry to one Nd(1), one Fe(5), three equivalent Fe(1), three equivalent Fe(7), and six equivalent Fe(3) atoms. In the seventh Fe site, Fe(6) is bonded in a 14-coordinate geometry to one Er(1), one Fe(6), three equivalent Fe(2), three equivalent Fe(7), and six equivalent Fe(4) atoms. is represented by the CIF card [CIF]
data_NdEr3Fe34
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.243
_cell_length_b   8.498
_cell_length_c   8.498
_cell_angle_alpha   119.993
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   515.518
_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
  Nd  Nd0  1  0.250  0.667  0.333  1.0
  Er  Er1  1  0.750  0.333  0.667  1.0
  Er  Er2  1  0.750  0.000  1.000  1.0
  Er  Er3  1  0.250  0.000  1.000  1.0
  Fe  Fe4  1  0.485  0.835  0.670  1.0
  Fe  Fe5  1  0.485  0.835  0.165  1.0
  Fe  Fe6  1  0.485  0.330  0.165  1.0
  Fe  Fe7  1  0.517  0.166  0.332  1.0
  Fe  Fe8  1  0.517  0.166  0.834  1.0
  Fe  Fe9  1  0.517  0.668  0.834  1.0
  Fe  Fe10  1  0.983  0.166  0.332  1.0
  Fe  Fe11  1  0.983  0.166  0.834  1.0
  Fe  Fe12  1  0.983  0.668  0.834  1.0
  Fe  Fe13  1  0.015  0.835  0.670  1.0
  Fe  Fe14  1  0.015  0.835  0.165  1.0
  Fe  Fe15  1  0.015  0.330  0.165  1.0
  Fe  Fe16  1  0.750  0.671  0.040  1.0
  Fe  Fe17  1  0.750  0.369  0.329  1.0
  Fe  Fe18  1  0.750  0.960  0.631  1.0
  Fe  Fe19  1  0.750  0.369  0.040  1.0
  Fe  Fe20  1  0.750  0.960  0.329  1.0
  Fe  Fe21  1  0.750  0.671  0.631  1.0
  Fe  Fe22  1  0.250  0.328  0.958  1.0
  Fe  Fe23  1  0.250  0.630  0.672  1.0
  Fe  Fe24  1  0.250  0.042  0.370  1.0
  Fe  Fe25  1  0.250  0.630  0.958  1.0
  Fe  Fe26  1  0.250  0.042  0.672  1.0
  Fe  Fe27  1  0.250  0.328  0.370  1.0
  Fe  Fe28  1  0.607  0.667  0.333  1.0
  Fe  Fe29  1  0.394  0.333  0.667  1.0
  Fe  Fe30  1  0.106  0.333  0.667  1.0
  Fe  Fe31  1  0.893  0.667  0.333  1.0
  Fe  Fe32  1  0.501  0.499  0.998  1.0
  Fe  Fe33  1  0.501  0.499  0.501  1.0
  Fe  Fe34  1  0.501  0.002  0.501  1.0
  Fe  Fe35  1  0.999  0.499  0.998  1.0
  Fe  Fe36  1  0.999  0.499  0.501  1.0
  Fe  Fe37  1  0.999  0.002  0.501  1.0
[/CIF]
.
The material described by Er3NdFe34 crystallizes in the hexagonal P-6m2 space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 20-coordinate geometry to two equivalent Fe(6), six equivalent Fe(2), six equivalent Fe(3), and six equivalent Fe(7) atoms. In the second Er site, Er(2) is bonded in a 18-coordinate geometry to six equivalent Fe(1), six equivalent Fe(2), and six equivalent Fe(3) atoms. In the third Er site, Er(3) is bonded in a 18-coordinate geometry to six equivalent Fe(1), six equivalent Fe(2), and six equivalent Fe(4) atoms. Nd(1) is bonded in a 20-coordinate geometry to two equivalent Fe(5), six equivalent Fe(1), six equivalent Fe(4), and six equivalent Fe(7) atoms. There are seven inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one Er(2), one Er(3), one Nd(1), one Fe(5), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and two equivalent Fe(7) atoms to form distorted FeNdEr2Fe9 cuboctahedra that share corners with four equivalent Fe(2)Er3Fe9 cuboctahedra, corners with five equivalent Fe(7)NdErFe10 cuboctahedra, corners with six equivalent Fe(1)NdEr2Fe9 cuboctahedra, edges with three equivalent Fe(7)NdErFe10 cuboctahedra, edges with five equivalent Fe(2)Er3Fe9 cuboctahedra, faces with two equivalent Fe(2)Er3Fe9 cuboctahedra, faces with two equivalent Fe(7)NdErFe10 cuboctahedra, and faces with six equivalent Fe(1)NdEr2Fe9 cuboctahedra. In the second Fe site, Fe(7) is bonded to one Er(1), one Nd(1), one Fe(5), one Fe(6), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(4) atoms to form FeNdErFe10 cuboctahedra that share corners with four equivalent Fe(7)NdErFe10 cuboctahedra, corners with five equivalent Fe(2)Er3Fe9 cuboctahedra, corners with five equivalent Fe(1)NdEr2Fe9 cuboctahedra, edges with three equivalent Fe(2)Er3Fe9 cuboctahedra, edges with three equivalent Fe(1)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(2)Er3Fe9 cuboctahedra, faces with two equivalent Fe(1)NdEr2Fe9 cuboctahedra, and faces with six equivalent Fe(7)NdErFe10 cuboctahedra. In the third Fe site, Fe(2) is bonded to one Er(1), one Er(2), one Er(3), one Fe(6), two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(4), and two equivalent Fe(7) atoms to form distorted FeEr3Fe9 cuboctahedra that share corners with four equivalent Fe(1)NdEr2Fe9 cuboctahedra, corners with five equivalent Fe(7)NdErFe10 cuboctahedra, corners with six equivalent Fe(2)Er3Fe9 cuboctahedra, edges with three equivalent Fe(7)NdErFe10 cuboctahedra, edges with five equivalent Fe(1)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(1)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(7)NdErFe10 cuboctahedra, and faces with six equivalent Fe(2)Er3Fe9 cuboctahedra. In the fourth Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Er(1), one Er(2), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(5), and two equivalent Fe(7) atoms. In the fifth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Er(3), one Nd(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(4), two equivalent Fe(6), and two equivalent Fe(7) atoms. In the sixth Fe site, Fe(5) is bonded in a 14-coordinate geometry to one Nd(1), one Fe(5), three equivalent Fe(1), three equivalent Fe(7), and six equivalent Fe(3) atoms. In the seventh Fe site, Fe(6) is bonded in a 14-coordinate geometry to one Er(1), one Fe(6), three equivalent Fe(2), three equivalent Fe(7), and six equivalent Fe(4) atoms. is represented by the CIF card [CIF]
data_NdEr3Fe34
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.243
_cell_length_b   8.498
_cell_length_c   8.498
_cell_angle_alpha   119.993
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   515.518
_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
  Nd  Nd0  1  0.250  0.667  0.333  1.0
  Er  Er1  1  0.750  0.333  0.667  1.0
  Er  Er2  1  0.750  0.000  1.000  1.0
  Er  Er3  1  0.250  0.000  1.000  1.0
  Fe  Fe4  1  0.485  0.835  0.670  1.0
  Fe  Fe5  1  0.485  0.835  0.165  1.0
  Fe  Fe6  1  0.485  0.330  0.165  1.0
  Fe  Fe7  1  0.517  0.166  0.332  1.0
  Fe  Fe8  1  0.517  0.166  0.834  1.0
  Fe  Fe9  1  0.517  0.668  0.834  1.0
  Fe  Fe10  1  0.983  0.166  0.332  1.0
  Fe  Fe11  1  0.983  0.166  0.834  1.0
  Fe  Fe12  1  0.983  0.668  0.834  1.0
  Fe  Fe13  1  0.015  0.835  0.670  1.0
  Fe  Fe14  1  0.015  0.835  0.165  1.0
  Fe  Fe15  1  0.015  0.330  0.165  1.0
  Fe  Fe16  1  0.750  0.671  0.040  1.0
  Fe  Fe17  1  0.750  0.369  0.329  1.0
  Fe  Fe18  1  0.750  0.960  0.631  1.0
  Fe  Fe19  1  0.750  0.369  0.040  1.0
  Fe  Fe20  1  0.750  0.960  0.329  1.0
  Fe  Fe21  1  0.750  0.671  0.631  1.0
  Fe  Fe22  1  0.250  0.328  0.958  1.0
  Fe  Fe23  1  0.250  0.630  0.672  1.0
  Fe  Fe24  1  0.250  0.042  0.370  1.0
  Fe  Fe25  1  0.250  0.630  0.958  1.0
  Fe  Fe26  1  0.250  0.042  0.672  1.0
  Fe  Fe27  1  0.250  0.328  0.370  1.0
  Fe  Fe28  1  0.607  0.667  0.333  1.0
  Fe  Fe29  1  0.394  0.333  0.667  1.0
  Fe  Fe30  1  0.106  0.333  0.667  1.0
  Fe  Fe31  1  0.893  0.667  0.333  1.0
  Fe  Fe32  1  0.501  0.499  0.998  1.0
  Fe  Fe33  1  0.501  0.499  0.501  1.0
  Fe  Fe34  1  0.501  0.002  0.501  1.0
  Fe  Fe35  1  0.999  0.499  0.998  1.0
  Fe  Fe36  1  0.999  0.499  0.501  1.0
  Fe  Fe37  1  0.999  0.002  0.501  1.0
[/CIF]
.