The material described by Er3NdFe34 crystallizes in the monoclinic Cm space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 19-coordinate geometry to one Fe(12), one Fe(18), one Fe(21), one Fe(22), one Fe(8), two equivalent Fe(1), two equivalent Fe(16), two equivalent Fe(4), two equivalent Fe(6), two equivalent Fe(9), and four equivalent Fe(20) atoms. In the second Er site, Er(2) is bonded in a 19-coordinate geometry to one Fe(13), one Fe(17), one Fe(18), one Fe(21), one Fe(7), two equivalent Fe(1), two equivalent Fe(19), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(9), and four equivalent Fe(15) atoms. In the third Er site, Er(3) is bonded in a 19-coordinate geometry to one Fe(14), one Fe(17), one Fe(18), one Fe(22), one Fe(8), two equivalent Fe(10), two equivalent Fe(2), two equivalent Fe(20), two equivalent Fe(4), two equivalent Fe(6), and four equivalent Fe(16) atoms. Nd(1) is bonded in a 19-coordinate geometry to one Fe(11), one Fe(17), one Fe(21), one Fe(22), one Fe(7), two equivalent Fe(10), two equivalent Fe(15), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(5), and four equivalent Fe(19) atoms. There are twenty-two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Er(1), one Er(2), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(20), one Fe(21), one Fe(3), one Fe(6), and two equivalent Fe(9) atoms. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to one Er(3), one Nd(1), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(19), one Fe(22), one Fe(4), one Fe(5), and two equivalent Fe(10) atoms. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Er(2), one Nd(1), one Fe(1), one Fe(12), one Fe(13), one Fe(19), one Fe(21), one Fe(3), one Fe(7), one Fe(9), and two equivalent Fe(15) atoms. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Er(1), one Er(3), one Fe(10), one Fe(11), one Fe(14), one Fe(2), one Fe(20), one Fe(22), one Fe(4), one Fe(8), and two equivalent Fe(16) atoms. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to one Er(2), one Nd(1), one Fe(10), one Fe(11), one Fe(14), one Fe(15), one Fe(17), one Fe(2), one Fe(5), one Fe(7), and two equivalent Fe(19) atoms. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to one Er(1), one Er(3), one Fe(1), one Fe(12), one Fe(13), one Fe(16), one Fe(18), one Fe(6), one Fe(8), one Fe(9), and two equivalent Fe(20) atoms. In the seventh Fe site, Fe(7) is bonded to one Er(2), one Nd(1), one Fe(11), one Fe(13), two equivalent Fe(15), two equivalent Fe(19), two equivalent Fe(3), and two equivalent Fe(5) atoms to form FeNdErFe10 cuboctahedra that share corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(17)NdEr2Fe9 cuboctahedra, corners with three equivalent Fe(21)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(18)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(22)NdEr2Fe9 cuboctahedra, edges with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, edges with two equivalent Fe(15)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the eighth Fe site, Fe(8) is bonded to one Er(1), one Er(3), one Fe(12), one Fe(14), two equivalent Fe(16), two equivalent Fe(20), two equivalent Fe(4), and two equivalent Fe(6) atoms to form FeEr2Fe10 cuboctahedra that share corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(18)Er3Fe9 cuboctahedra, corners with three equivalent Fe(22)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(17)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(21)NdEr2Fe9 cuboctahedra, edges with two equivalent Fe(16)Er3Fe9 cuboctahedra, edges with two equivalent Fe(20)Er3Fe9 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the ninth Fe site, Fe(9) is bonded to one Er(1), one Er(2), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(20), one Fe(21), one Fe(3), one Fe(6), and two equivalent Fe(1) atoms to form FeEr2Fe10 cuboctahedra that share  a cornercorner with one Fe(8)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(17)NdEr2Fe9 cuboctahedra,  a cornercorner with one Fe(22)NdEr2Fe9 cuboctahedra,  a cornercorner with one Fe(7)NdErFe10 cuboctahedra, corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(16)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(20)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(19)Nd2ErFe9 cuboctahedra,  an edgeedge with one Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(21)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, and faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra. In the tenth Fe site, Fe(10) is bonded to one Er(3), one Nd(1), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(19), one Fe(22), one Fe(4), one Fe(5), and two equivalent Fe(2) atoms to form FeNdErFe10 cuboctahedra that share  a cornercorner with one Fe(8)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(18)Er3Fe9 cuboctahedra,  a cornercorner with one Fe(21)NdEr2Fe9 cuboctahedra,  a cornercorner with one Fe(7)NdErFe10 cuboctahedra, corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra,  an edgeedge with one Fe(16)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(20)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(19)Nd2ErFe9 cuboctahedra,  an edgeedge with one Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(17)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(22)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the eleventh Fe site, Fe(11) is bonded in a 14-coordinate geometry to one Nd(1), one Fe(14), one Fe(22), one Fe(7), two equivalent Fe(10), two equivalent Fe(19), two equivalent Fe(2), two equivalent Fe(4), and two equivalent Fe(5) atoms. In the twelfth Fe site, Fe(12) is bonded in a 14-coordinate geometry to one Er(1), one Fe(13), one Fe(21), one Fe(8), two equivalent Fe(1), two equivalent Fe(20), two equivalent Fe(3), two equivalent Fe(6), and two equivalent Fe(9) atoms. In the thirteenth Fe site, Fe(13) is bonded in a 14-coordinate geometry to one Er(2), one Fe(12), one Fe(18), one Fe(7), two equivalent Fe(1), two equivalent Fe(15), two equivalent Fe(3), two equivalent Fe(6), and two equivalent Fe(9) atoms. In the fourteenth Fe site, Fe(14) is bonded in a 14-coordinate geometry to one Er(3), one Fe(11), one Fe(17), one Fe(8), two equivalent Fe(10), two equivalent Fe(16), two equivalent Fe(2), two equivalent Fe(4), and two equivalent Fe(5) atoms. In the fifteenth Fe site, Fe(15) is bonded to two equivalent Er(2), one Nd(1), one Fe(1), one Fe(13), one Fe(19), one Fe(21), one Fe(5), one Fe(7), one Fe(9), and two equivalent Fe(3) atoms to form FeNdEr2Fe9 cuboctahedra that share  a cornercorner with one Fe(22)NdEr2Fe9 cuboctahedra,  a cornercorner with one Fe(7)NdErFe10 cuboctahedra, corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(21)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(19)Nd2ErFe9 cuboctahedra,  an edgeedge with one Fe(9)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(18)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(19)Nd2ErFe9 cuboctahedra,  an edgeedge with one Fe(17)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(10)NdErFe10 cuboctahedra,  an edgeedge with one Fe(7)NdErFe10 cuboctahedra, edges with two equivalent Fe(15)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, and faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra. In the sixteenth Fe site, Fe(16) is bonded to one Er(1), two equivalent Er(3), one Fe(10), one Fe(14), one Fe(2), one Fe(20), one Fe(22), one Fe(6), one Fe(8), and two equivalent Fe(4) atoms to form FeEr3Fe9 cuboctahedra that share  a cornercorner with one Fe(8)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(21)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(22)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(20)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(8)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(9)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(18)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(20)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(17)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(10)NdErFe10 cuboctahedra, edges with two equivalent Fe(16)Er3Fe9 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the seventeenth Fe site, Fe(17) is bonded to one Er(2), one Er(3), one Nd(1), one Fe(14), two equivalent Fe(10), two equivalent Fe(19), two equivalent Fe(2), and two equivalent Fe(5) atoms to form FeNdEr2Fe9 cuboctahedra that share corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(18)Er3Fe9 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(22)NdEr2Fe9 cuboctahedra, corners with three equivalent Fe(7)NdErFe10 cuboctahedra, corners with four equivalent Fe(19)Nd2ErFe9 cuboctahedra,  an edgeedge with one Fe(8)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(21)NdEr2Fe9 cuboctahedra, edges with two equivalent Fe(16)Er3Fe9 cuboctahedra, edges with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, edges with two equivalent Fe(10)NdErFe10 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the eighteenth Fe site, Fe(18) is bonded to one Er(1), one Er(2), one Er(3), one Fe(13), two equivalent Fe(1), two equivalent Fe(20), two equivalent Fe(6), and two equivalent Fe(9) atoms to form FeEr3Fe9 cuboctahedra that share corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(17)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(21)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(8)Er2Fe10 cuboctahedra, corners with four equivalent Fe(20)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(22)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(7)NdErFe10 cuboctahedra, edges with two equivalent Fe(9)Er2Fe10 cuboctahedra, edges with two equivalent Fe(16)Er3Fe9 cuboctahedra, edges with two equivalent Fe(15)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, and faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra. In the nineteenth Fe site, Fe(19) is bonded to one Er(2), two equivalent Nd(1), one Fe(10), one Fe(11), one Fe(15), one Fe(17), one Fe(2), one Fe(3), one Fe(7), and two equivalent Fe(5) atoms to form FeNd2ErFe9 cuboctahedra that share  a cornercorner with one Fe(18)Er3Fe9 cuboctahedra,  a cornercorner with one Fe(7)NdErFe10 cuboctahedra, corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(17)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(9)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(21)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(22)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(10)NdErFe10 cuboctahedra,  an edgeedge with one Fe(7)NdErFe10 cuboctahedra, edges with two equivalent Fe(19)Nd2ErFe9 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the twentieth Fe site, Fe(20) is bonded to one Er(3), two equivalent Er(1), one Fe(1), one Fe(12), one Fe(16), one Fe(18), one Fe(4), one Fe(8), one Fe(9), and two equivalent Fe(6) atoms to form FeEr3Fe9 cuboctahedra that share  a cornercorner with one Fe(8)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(17)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(18)Er3Fe9 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(16)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(8)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(9)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(16)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(21)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(22)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(10)NdErFe10 cuboctahedra, edges with two equivalent Fe(20)Er3Fe9 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, and faces with two equivalent Fe(20)Er3Fe9 cuboctahedra. In the twenty-first Fe site, Fe(21) is bonded to one Er(1), one Er(2), one Nd(1), one Fe(12), two equivalent Fe(1), two equivalent Fe(15), two equivalent Fe(3), and two equivalent Fe(9) atoms to form FeNdEr2Fe9 cuboctahedra that share corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(18)Er3Fe9 cuboctahedra, corners with two equivalent Fe(22)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(7)NdErFe10 cuboctahedra, corners with four equivalent Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(8)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(17)NdEr2Fe9 cuboctahedra, edges with two equivalent Fe(9)Er2Fe10 cuboctahedra, edges with two equivalent Fe(20)Er3Fe9 cuboctahedra, edges with two equivalent Fe(19)Nd2ErFe9 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, and faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra. In the twenty-second Fe site, Fe(22) is bonded to one Er(1), one Er(3), one Nd(1), one Fe(11), two equivalent Fe(10), two equivalent Fe(16), two equivalent Fe(2), and two equivalent Fe(4) atoms to form FeNdEr2Fe9 cuboctahedra that share corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(17)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(21)NdEr2Fe9 cuboctahedra, corners with three equivalent Fe(8)Er2Fe10 cuboctahedra, corners with four equivalent Fe(16)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(7)NdErFe10 cuboctahedra, edges with two equivalent Fe(20)Er3Fe9 cuboctahedra, edges with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, edges with two equivalent Fe(10)NdErFe10 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. is represented by the CIF file [CIF]
data_NdEr3Fe34
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.407
_cell_length_b   6.407
_cell_length_c   12.796
_cell_angle_alpha   82.870
_cell_angle_beta   82.870
_cell_angle_gamma   82.812
_symmetry_Int_Tables_number   1
_cell_volume   514.018
_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  0.342  0.342  0.671  1.0
  Er  Er1  1  0.341  0.341  0.170  1.0
  Er  Er2  1  0.660  0.660  0.830  1.0
  Er  Er3  1  0.659  0.659  0.330  1.0
  Fe  Fe4  1  0.705  0.295  0.001  1.0
  Fe  Fe5  1  0.709  0.293  0.499  1.0
  Fe  Fe6  1  0.294  0.998  0.854  1.0
  Fe  Fe7  1  0.295  1.000  0.352  1.0
  Fe  Fe8  1  0.999  0.707  0.647  1.0
  Fe  Fe9  1  0.000  0.705  0.148  1.0
  Fe  Fe10  1  0.707  0.999  0.647  1.0
  Fe  Fe11  1  0.705  0.000  0.148  1.0
  Fe  Fe12  1  0.998  0.294  0.854  1.0
  Fe  Fe13  1  1.000  0.295  0.352  1.0
  Fe  Fe14  1  0.293  0.709  0.499  1.0
  Fe  Fe15  1  0.295  0.705  0.001  1.0
  Fe  Fe16  1  0.999  0.999  0.751  1.0
  Fe  Fe17  1  1.000  1.000  0.250  1.0
  Fe  Fe18  1  1.000  0.500  0.000  1.0
  Fe  Fe19  1  0.999  0.501  0.499  1.0
  Fe  Fe20  1  0.500  1.000  0.000  1.0
  Fe  Fe21  1  0.501  0.999  0.499  1.0
  Fe  Fe22  1  0.096  0.096  0.548  1.0
  Fe  Fe23  1  0.097  0.097  0.049  1.0
  Fe  Fe24  1  0.903  0.903  0.952  1.0
  Fe  Fe25  1  0.903  0.903  0.450  1.0
  Fe  Fe26  1  0.155  0.658  0.830  1.0
  Fe  Fe27  1  0.156  0.656  0.328  1.0
  Fe  Fe28  1  0.658  0.658  0.577  1.0
  Fe  Fe29  1  0.656  0.656  0.078  1.0
  Fe  Fe30  1  0.658  0.155  0.830  1.0
  Fe  Fe31  1  0.656  0.156  0.328  1.0
  Fe  Fe32  1  0.844  0.344  0.672  1.0
  Fe  Fe33  1  0.844  0.344  0.172  1.0
  Fe  Fe34  1  0.344  0.344  0.924  1.0
  Fe  Fe35  1  0.344  0.344  0.421  1.0
  Fe  Fe36  1  0.344  0.844  0.672  1.0
  Fe  Fe37  1  0.344  0.844  0.172  1.0
[/CIF]
.
The material described by Er3NdFe34 crystallizes in the monoclinic Cm space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 19-coordinate geometry to one Fe(12), one Fe(18), one Fe(21), one Fe(22), one Fe(8), two equivalent Fe(1), two equivalent Fe(16), two equivalent Fe(4), two equivalent Fe(6), two equivalent Fe(9), and four equivalent Fe(20) atoms. In the second Er site, Er(2) is bonded in a 19-coordinate geometry to one Fe(13), one Fe(17), one Fe(18), one Fe(21), one Fe(7), two equivalent Fe(1), two equivalent Fe(19), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(9), and four equivalent Fe(15) atoms. In the third Er site, Er(3) is bonded in a 19-coordinate geometry to one Fe(14), one Fe(17), one Fe(18), one Fe(22), one Fe(8), two equivalent Fe(10), two equivalent Fe(2), two equivalent Fe(20), two equivalent Fe(4), two equivalent Fe(6), and four equivalent Fe(16) atoms. Nd(1) is bonded in a 19-coordinate geometry to one Fe(11), one Fe(17), one Fe(21), one Fe(22), one Fe(7), two equivalent Fe(10), two equivalent Fe(15), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(5), and four equivalent Fe(19) atoms. There are twenty-two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Er(1), one Er(2), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(20), one Fe(21), one Fe(3), one Fe(6), and two equivalent Fe(9) atoms. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to one Er(3), one Nd(1), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(19), one Fe(22), one Fe(4), one Fe(5), and two equivalent Fe(10) atoms. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to one Er(2), one Nd(1), one Fe(1), one Fe(12), one Fe(13), one Fe(19), one Fe(21), one Fe(3), one Fe(7), one Fe(9), and two equivalent Fe(15) atoms. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Er(1), one Er(3), one Fe(10), one Fe(11), one Fe(14), one Fe(2), one Fe(20), one Fe(22), one Fe(4), one Fe(8), and two equivalent Fe(16) atoms. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to one Er(2), one Nd(1), one Fe(10), one Fe(11), one Fe(14), one Fe(15), one Fe(17), one Fe(2), one Fe(5), one Fe(7), and two equivalent Fe(19) atoms. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to one Er(1), one Er(3), one Fe(1), one Fe(12), one Fe(13), one Fe(16), one Fe(18), one Fe(6), one Fe(8), one Fe(9), and two equivalent Fe(20) atoms. In the seventh Fe site, Fe(7) is bonded to one Er(2), one Nd(1), one Fe(11), one Fe(13), two equivalent Fe(15), two equivalent Fe(19), two equivalent Fe(3), and two equivalent Fe(5) atoms to form FeNdErFe10 cuboctahedra that share corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(17)NdEr2Fe9 cuboctahedra, corners with three equivalent Fe(21)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(18)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(22)NdEr2Fe9 cuboctahedra, edges with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, edges with two equivalent Fe(15)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the eighth Fe site, Fe(8) is bonded to one Er(1), one Er(3), one Fe(12), one Fe(14), two equivalent Fe(16), two equivalent Fe(20), two equivalent Fe(4), and two equivalent Fe(6) atoms to form FeEr2Fe10 cuboctahedra that share corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(18)Er3Fe9 cuboctahedra, corners with three equivalent Fe(22)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(17)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(21)NdEr2Fe9 cuboctahedra, edges with two equivalent Fe(16)Er3Fe9 cuboctahedra, edges with two equivalent Fe(20)Er3Fe9 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the ninth Fe site, Fe(9) is bonded to one Er(1), one Er(2), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(20), one Fe(21), one Fe(3), one Fe(6), and two equivalent Fe(1) atoms to form FeEr2Fe10 cuboctahedra that share  a cornercorner with one Fe(8)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(17)NdEr2Fe9 cuboctahedra,  a cornercorner with one Fe(22)NdEr2Fe9 cuboctahedra,  a cornercorner with one Fe(7)NdErFe10 cuboctahedra, corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(16)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(20)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(19)Nd2ErFe9 cuboctahedra,  an edgeedge with one Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(21)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, and faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra. In the tenth Fe site, Fe(10) is bonded to one Er(3), one Nd(1), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(19), one Fe(22), one Fe(4), one Fe(5), and two equivalent Fe(2) atoms to form FeNdErFe10 cuboctahedra that share  a cornercorner with one Fe(8)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(18)Er3Fe9 cuboctahedra,  a cornercorner with one Fe(21)NdEr2Fe9 cuboctahedra,  a cornercorner with one Fe(7)NdErFe10 cuboctahedra, corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra,  an edgeedge with one Fe(16)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(20)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(19)Nd2ErFe9 cuboctahedra,  an edgeedge with one Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(17)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(22)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the eleventh Fe site, Fe(11) is bonded in a 14-coordinate geometry to one Nd(1), one Fe(14), one Fe(22), one Fe(7), two equivalent Fe(10), two equivalent Fe(19), two equivalent Fe(2), two equivalent Fe(4), and two equivalent Fe(5) atoms. In the twelfth Fe site, Fe(12) is bonded in a 14-coordinate geometry to one Er(1), one Fe(13), one Fe(21), one Fe(8), two equivalent Fe(1), two equivalent Fe(20), two equivalent Fe(3), two equivalent Fe(6), and two equivalent Fe(9) atoms. In the thirteenth Fe site, Fe(13) is bonded in a 14-coordinate geometry to one Er(2), one Fe(12), one Fe(18), one Fe(7), two equivalent Fe(1), two equivalent Fe(15), two equivalent Fe(3), two equivalent Fe(6), and two equivalent Fe(9) atoms. In the fourteenth Fe site, Fe(14) is bonded in a 14-coordinate geometry to one Er(3), one Fe(11), one Fe(17), one Fe(8), two equivalent Fe(10), two equivalent Fe(16), two equivalent Fe(2), two equivalent Fe(4), and two equivalent Fe(5) atoms. In the fifteenth Fe site, Fe(15) is bonded to two equivalent Er(2), one Nd(1), one Fe(1), one Fe(13), one Fe(19), one Fe(21), one Fe(5), one Fe(7), one Fe(9), and two equivalent Fe(3) atoms to form FeNdEr2Fe9 cuboctahedra that share  a cornercorner with one Fe(22)NdEr2Fe9 cuboctahedra,  a cornercorner with one Fe(7)NdErFe10 cuboctahedra, corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(21)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(19)Nd2ErFe9 cuboctahedra,  an edgeedge with one Fe(9)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(18)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(19)Nd2ErFe9 cuboctahedra,  an edgeedge with one Fe(17)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(10)NdErFe10 cuboctahedra,  an edgeedge with one Fe(7)NdErFe10 cuboctahedra, edges with two equivalent Fe(15)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, and faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra. In the sixteenth Fe site, Fe(16) is bonded to one Er(1), two equivalent Er(3), one Fe(10), one Fe(14), one Fe(2), one Fe(20), one Fe(22), one Fe(6), one Fe(8), and two equivalent Fe(4) atoms to form FeEr3Fe9 cuboctahedra that share  a cornercorner with one Fe(8)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(21)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(22)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(20)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(8)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(9)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(18)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(20)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(17)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(10)NdErFe10 cuboctahedra, edges with two equivalent Fe(16)Er3Fe9 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the seventeenth Fe site, Fe(17) is bonded to one Er(2), one Er(3), one Nd(1), one Fe(14), two equivalent Fe(10), two equivalent Fe(19), two equivalent Fe(2), and two equivalent Fe(5) atoms to form FeNdEr2Fe9 cuboctahedra that share corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(18)Er3Fe9 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(22)NdEr2Fe9 cuboctahedra, corners with three equivalent Fe(7)NdErFe10 cuboctahedra, corners with four equivalent Fe(19)Nd2ErFe9 cuboctahedra,  an edgeedge with one Fe(8)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(21)NdEr2Fe9 cuboctahedra, edges with two equivalent Fe(16)Er3Fe9 cuboctahedra, edges with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, edges with two equivalent Fe(10)NdErFe10 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the eighteenth Fe site, Fe(18) is bonded to one Er(1), one Er(2), one Er(3), one Fe(13), two equivalent Fe(1), two equivalent Fe(20), two equivalent Fe(6), and two equivalent Fe(9) atoms to form FeEr3Fe9 cuboctahedra that share corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(17)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(21)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(8)Er2Fe10 cuboctahedra, corners with four equivalent Fe(20)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(22)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(7)NdErFe10 cuboctahedra, edges with two equivalent Fe(9)Er2Fe10 cuboctahedra, edges with two equivalent Fe(16)Er3Fe9 cuboctahedra, edges with two equivalent Fe(15)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, and faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra. In the nineteenth Fe site, Fe(19) is bonded to one Er(2), two equivalent Nd(1), one Fe(10), one Fe(11), one Fe(15), one Fe(17), one Fe(2), one Fe(3), one Fe(7), and two equivalent Fe(5) atoms to form FeNd2ErFe9 cuboctahedra that share  a cornercorner with one Fe(18)Er3Fe9 cuboctahedra,  a cornercorner with one Fe(7)NdErFe10 cuboctahedra, corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, corners with two equivalent Fe(17)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(9)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(21)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(22)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(10)NdErFe10 cuboctahedra,  an edgeedge with one Fe(7)NdErFe10 cuboctahedra, edges with two equivalent Fe(19)Nd2ErFe9 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. In the twentieth Fe site, Fe(20) is bonded to one Er(3), two equivalent Er(1), one Fe(1), one Fe(12), one Fe(16), one Fe(18), one Fe(4), one Fe(8), one Fe(9), and two equivalent Fe(6) atoms to form FeEr3Fe9 cuboctahedra that share  a cornercorner with one Fe(8)Er2Fe10 cuboctahedra,  a cornercorner with one Fe(17)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(18)Er3Fe9 cuboctahedra, corners with two equivalent Fe(20)Er3Fe9 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(16)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(8)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(9)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(16)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(21)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(22)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(10)NdErFe10 cuboctahedra, edges with two equivalent Fe(20)Er3Fe9 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(21)NdEr2Fe9 cuboctahedra,  a faceface with one Fe(22)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, and faces with two equivalent Fe(20)Er3Fe9 cuboctahedra. In the twenty-first Fe site, Fe(21) is bonded to one Er(1), one Er(2), one Nd(1), one Fe(12), two equivalent Fe(1), two equivalent Fe(15), two equivalent Fe(3), and two equivalent Fe(9) atoms to form FeNdEr2Fe9 cuboctahedra that share corners with two equivalent Fe(16)Er3Fe9 cuboctahedra, corners with two equivalent Fe(18)Er3Fe9 cuboctahedra, corners with two equivalent Fe(22)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(10)NdErFe10 cuboctahedra, corners with three equivalent Fe(7)NdErFe10 cuboctahedra, corners with four equivalent Fe(15)NdEr2Fe9 cuboctahedra,  an edgeedge with one Fe(8)Er2Fe10 cuboctahedra,  an edgeedge with one Fe(17)NdEr2Fe9 cuboctahedra, edges with two equivalent Fe(9)Er2Fe10 cuboctahedra, edges with two equivalent Fe(20)Er3Fe9 cuboctahedra, edges with two equivalent Fe(19)Nd2ErFe9 cuboctahedra,  a faceface with one Fe(18)Er3Fe9 cuboctahedra,  a faceface with one Fe(7)NdErFe10 cuboctahedra, faces with two equivalent Fe(9)Er2Fe10 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, and faces with two equivalent Fe(15)NdEr2Fe9 cuboctahedra. In the twenty-second Fe site, Fe(22) is bonded to one Er(1), one Er(3), one Nd(1), one Fe(11), two equivalent Fe(10), two equivalent Fe(16), two equivalent Fe(2), and two equivalent Fe(4) atoms to form FeNdEr2Fe9 cuboctahedra that share corners with two equivalent Fe(9)Er2Fe10 cuboctahedra, corners with two equivalent Fe(15)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(17)NdEr2Fe9 cuboctahedra, corners with two equivalent Fe(21)NdEr2Fe9 cuboctahedra, corners with three equivalent Fe(8)Er2Fe10 cuboctahedra, corners with four equivalent Fe(16)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Er3Fe9 cuboctahedra,  an edgeedge with one Fe(7)NdErFe10 cuboctahedra, edges with two equivalent Fe(20)Er3Fe9 cuboctahedra, edges with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, edges with two equivalent Fe(10)NdErFe10 cuboctahedra,  a faceface with one Fe(8)Er2Fe10 cuboctahedra,  a faceface with one Fe(17)NdEr2Fe9 cuboctahedra, faces with two equivalent Fe(16)Er3Fe9 cuboctahedra, faces with two equivalent Fe(20)Er3Fe9 cuboctahedra, faces with two equivalent Fe(19)Nd2ErFe9 cuboctahedra, and faces with two equivalent Fe(10)NdErFe10 cuboctahedra. is represented by the CIF file [CIF]
data_NdEr3Fe34
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.407
_cell_length_b   6.407
_cell_length_c   12.796
_cell_angle_alpha   82.870
_cell_angle_beta   82.870
_cell_angle_gamma   82.812
_symmetry_Int_Tables_number   1
_cell_volume   514.018
_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  0.342  0.342  0.671  1.0
  Er  Er1  1  0.341  0.341  0.170  1.0
  Er  Er2  1  0.660  0.660  0.830  1.0
  Er  Er3  1  0.659  0.659  0.330  1.0
  Fe  Fe4  1  0.705  0.295  0.001  1.0
  Fe  Fe5  1  0.709  0.293  0.499  1.0
  Fe  Fe6  1  0.294  0.998  0.854  1.0
  Fe  Fe7  1  0.295  1.000  0.352  1.0
  Fe  Fe8  1  0.999  0.707  0.647  1.0
  Fe  Fe9  1  0.000  0.705  0.148  1.0
  Fe  Fe10  1  0.707  0.999  0.647  1.0
  Fe  Fe11  1  0.705  0.000  0.148  1.0
  Fe  Fe12  1  0.998  0.294  0.854  1.0
  Fe  Fe13  1  1.000  0.295  0.352  1.0
  Fe  Fe14  1  0.293  0.709  0.499  1.0
  Fe  Fe15  1  0.295  0.705  0.001  1.0
  Fe  Fe16  1  0.999  0.999  0.751  1.0
  Fe  Fe17  1  1.000  1.000  0.250  1.0
  Fe  Fe18  1  1.000  0.500  0.000  1.0
  Fe  Fe19  1  0.999  0.501  0.499  1.0
  Fe  Fe20  1  0.500  1.000  0.000  1.0
  Fe  Fe21  1  0.501  0.999  0.499  1.0
  Fe  Fe22  1  0.096  0.096  0.548  1.0
  Fe  Fe23  1  0.097  0.097  0.049  1.0
  Fe  Fe24  1  0.903  0.903  0.952  1.0
  Fe  Fe25  1  0.903  0.903  0.450  1.0
  Fe  Fe26  1  0.155  0.658  0.830  1.0
  Fe  Fe27  1  0.156  0.656  0.328  1.0
  Fe  Fe28  1  0.658  0.658  0.577  1.0
  Fe  Fe29  1  0.656  0.656  0.078  1.0
  Fe  Fe30  1  0.658  0.155  0.830  1.0
  Fe  Fe31  1  0.656  0.156  0.328  1.0
  Fe  Fe32  1  0.844  0.344  0.672  1.0
  Fe  Fe33  1  0.844  0.344  0.172  1.0
  Fe  Fe34  1  0.344  0.344  0.924  1.0
  Fe  Fe35  1  0.344  0.344  0.421  1.0
  Fe  Fe36  1  0.344  0.844  0.672  1.0
  Fe  Fe37  1  0.344  0.844  0.172  1.0
[/CIF]
.