The crystal structure described by SmNdFe17 crystallizes in the trigonal R3m space group. Sm(1) is bonded in a 19-coordinate geometry to one Fe(4), three equivalent Fe(2), three equivalent Fe(6), six equivalent Fe(1), and six equivalent Fe(5) atoms. Nd(1) is bonded in a 19-coordinate geometry to one Fe(3), three equivalent Fe(2), three equivalent Fe(5), six equivalent Fe(1), and six equivalent Fe(6) atoms. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Sm(1), one Nd(1), one Fe(3), one Fe(4), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(5), and two equivalent Fe(6) atoms. In the second Fe site, Fe(2) is bonded to one Sm(1), one Nd(1), one Fe(3), one Fe(4), two equivalent Fe(5), two equivalent Fe(6), and four equivalent Fe(1) atoms to form FeNdSmFe10 cuboctahedra that share corners with four equivalent Fe(2)NdSmFe10 cuboctahedra, corners with five equivalent Fe(6)Nd2SmFe9 cuboctahedra, corners with five equivalent Fe(5)NdSm2Fe9 cuboctahedra, edges with three equivalent Fe(6)Nd2SmFe9 cuboctahedra, edges with three equivalent Fe(5)NdSm2Fe9 cuboctahedra, faces with three equivalent Fe(6)Nd2SmFe9 cuboctahedra, faces with three equivalent Fe(5)NdSm2Fe9 cuboctahedra, and faces with four equivalent Fe(2)NdSmFe10 cuboctahedra. In the third Fe site, Fe(3) is bonded in a 14-coordinate geometry to one Nd(1), one Fe(4), three equivalent Fe(2), three equivalent Fe(6), and six equivalent Fe(1) atoms. In the fourth Fe site, Fe(4) is bonded in a 14-coordinate geometry to one Sm(1), one Fe(3), three equivalent Fe(2), three equivalent Fe(5), and six equivalent Fe(1) atoms. In the fifth Fe site, Fe(5) is bonded to two equivalent Sm(1), one Nd(1), one Fe(4), two equivalent Fe(2), two equivalent Fe(6), and four equivalent Fe(1) atoms to form FeNdSm2Fe9 cuboctahedra that share corners with two equivalent Fe(5)NdSm2Fe9 cuboctahedra, corners with five equivalent Fe(2)NdSmFe10 cuboctahedra, corners with eight equivalent Fe(6)Nd2SmFe9 cuboctahedra,  an edgeedge with one Fe(6)Nd2SmFe9 cuboctahedra, edges with three equivalent Fe(2)NdSmFe10 cuboctahedra, edges with four equivalent Fe(5)NdSm2Fe9 cuboctahedra, faces with three equivalent Fe(6)Nd2SmFe9 cuboctahedra, faces with three equivalent Fe(2)NdSmFe10 cuboctahedra, and faces with four equivalent Fe(5)NdSm2Fe9 cuboctahedra. In the sixth Fe site, Fe(6) is bonded to one Sm(1), two equivalent Nd(1), one Fe(3), two equivalent Fe(2), two equivalent Fe(5), and four equivalent Fe(1) atoms to form FeNd2SmFe9 cuboctahedra that share corners with two equivalent Fe(6)Nd2SmFe9 cuboctahedra, corners with five equivalent Fe(2)NdSmFe10 cuboctahedra, corners with eight equivalent Fe(5)NdSm2Fe9 cuboctahedra,  an edgeedge with one Fe(5)NdSm2Fe9 cuboctahedra, edges with three equivalent Fe(2)NdSmFe10 cuboctahedra, edges with four equivalent Fe(6)Nd2SmFe9 cuboctahedra, faces with three equivalent Fe(5)NdSm2Fe9 cuboctahedra, faces with three equivalent Fe(2)NdSmFe10 cuboctahedra, and faces with four equivalent Fe(6)Nd2SmFe9 cuboctahedra. is represented by the CIF card [CIF]
data_NdSmFe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.456
_cell_length_b   6.456
_cell_length_c   6.456
_cell_angle_alpha   83.030
_cell_angle_beta   83.030
_cell_angle_gamma   83.030
_symmetry_Int_Tables_number   1
_cell_volume   263.507
_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  0.342  1.0
  Sm  Sm1  1  0.659  0.659  0.659  1.0
  Fe  Fe2  1  0.291  1.000  0.710  1.0
  Fe  Fe3  1  1.000  0.710  0.291  1.0
  Fe  Fe4  1  0.710  0.291  1.000  1.0
  Fe  Fe5  1  1.000  0.291  0.710  1.0
  Fe  Fe6  1  0.291  0.710  1.000  1.0
  Fe  Fe7  1  0.710  1.000  0.291  1.0
  Fe  Fe8  1  1.000  0.500  1.000  1.0
  Fe  Fe9  1  0.500  1.000  1.000  1.0
  Fe  Fe10  1  1.000  1.000  0.500  1.0
  Fe  Fe11  1  0.097  0.097  0.097  1.0
  Fe  Fe12  1  0.903  0.903  0.903  1.0
  Fe  Fe13  1  0.658  0.155  0.658  1.0
  Fe  Fe14  1  0.155  0.658  0.658  1.0
  Fe  Fe15  1  0.658  0.658  0.155  1.0
  Fe  Fe16  1  0.343  0.845  0.343  1.0
  Fe  Fe17  1  0.845  0.343  0.343  1.0
  Fe  Fe18  1  0.343  0.343  0.845  1.0
[/CIF]
.
The crystal structure described by SmNdFe17 crystallizes in the trigonal R3m space group. Sm(1) is bonded in a 19-coordinate geometry to one Fe(4), three equivalent Fe(2), three equivalent Fe(6), six equivalent Fe(1), and six equivalent Fe(5) atoms. Nd(1) is bonded in a 19-coordinate geometry to one Fe(3), three equivalent Fe(2), three equivalent Fe(5), six equivalent Fe(1), and six equivalent Fe(6) atoms. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Sm(1), one Nd(1), one Fe(3), one Fe(4), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(5), and two equivalent Fe(6) atoms. In the second Fe site, Fe(2) is bonded to one Sm(1), one Nd(1), one Fe(3), one Fe(4), two equivalent Fe(5), two equivalent Fe(6), and four equivalent Fe(1) atoms to form FeNdSmFe10 cuboctahedra that share corners with four equivalent Fe(2)NdSmFe10 cuboctahedra, corners with five equivalent Fe(6)Nd2SmFe9 cuboctahedra, corners with five equivalent Fe(5)NdSm2Fe9 cuboctahedra, edges with three equivalent Fe(6)Nd2SmFe9 cuboctahedra, edges with three equivalent Fe(5)NdSm2Fe9 cuboctahedra, faces with three equivalent Fe(6)Nd2SmFe9 cuboctahedra, faces with three equivalent Fe(5)NdSm2Fe9 cuboctahedra, and faces with four equivalent Fe(2)NdSmFe10 cuboctahedra. In the third Fe site, Fe(3) is bonded in a 14-coordinate geometry to one Nd(1), one Fe(4), three equivalent Fe(2), three equivalent Fe(6), and six equivalent Fe(1) atoms. In the fourth Fe site, Fe(4) is bonded in a 14-coordinate geometry to one Sm(1), one Fe(3), three equivalent Fe(2), three equivalent Fe(5), and six equivalent Fe(1) atoms. In the fifth Fe site, Fe(5) is bonded to two equivalent Sm(1), one Nd(1), one Fe(4), two equivalent Fe(2), two equivalent Fe(6), and four equivalent Fe(1) atoms to form FeNdSm2Fe9 cuboctahedra that share corners with two equivalent Fe(5)NdSm2Fe9 cuboctahedra, corners with five equivalent Fe(2)NdSmFe10 cuboctahedra, corners with eight equivalent Fe(6)Nd2SmFe9 cuboctahedra,  an edgeedge with one Fe(6)Nd2SmFe9 cuboctahedra, edges with three equivalent Fe(2)NdSmFe10 cuboctahedra, edges with four equivalent Fe(5)NdSm2Fe9 cuboctahedra, faces with three equivalent Fe(6)Nd2SmFe9 cuboctahedra, faces with three equivalent Fe(2)NdSmFe10 cuboctahedra, and faces with four equivalent Fe(5)NdSm2Fe9 cuboctahedra. In the sixth Fe site, Fe(6) is bonded to one Sm(1), two equivalent Nd(1), one Fe(3), two equivalent Fe(2), two equivalent Fe(5), and four equivalent Fe(1) atoms to form FeNd2SmFe9 cuboctahedra that share corners with two equivalent Fe(6)Nd2SmFe9 cuboctahedra, corners with five equivalent Fe(2)NdSmFe10 cuboctahedra, corners with eight equivalent Fe(5)NdSm2Fe9 cuboctahedra,  an edgeedge with one Fe(5)NdSm2Fe9 cuboctahedra, edges with three equivalent Fe(2)NdSmFe10 cuboctahedra, edges with four equivalent Fe(6)Nd2SmFe9 cuboctahedra, faces with three equivalent Fe(5)NdSm2Fe9 cuboctahedra, faces with three equivalent Fe(2)NdSmFe10 cuboctahedra, and faces with four equivalent Fe(6)Nd2SmFe9 cuboctahedra. is represented by the CIF card [CIF]
data_NdSmFe17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.456
_cell_length_b   6.456
_cell_length_c   6.456
_cell_angle_alpha   83.030
_cell_angle_beta   83.030
_cell_angle_gamma   83.030
_symmetry_Int_Tables_number   1
_cell_volume   263.507
_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  0.342  1.0
  Sm  Sm1  1  0.659  0.659  0.659  1.0
  Fe  Fe2  1  0.291  1.000  0.710  1.0
  Fe  Fe3  1  1.000  0.710  0.291  1.0
  Fe  Fe4  1  0.710  0.291  1.000  1.0
  Fe  Fe5  1  1.000  0.291  0.710  1.0
  Fe  Fe6  1  0.291  0.710  1.000  1.0
  Fe  Fe7  1  0.710  1.000  0.291  1.0
  Fe  Fe8  1  1.000  0.500  1.000  1.0
  Fe  Fe9  1  0.500  1.000  1.000  1.0
  Fe  Fe10  1  1.000  1.000  0.500  1.0
  Fe  Fe11  1  0.097  0.097  0.097  1.0
  Fe  Fe12  1  0.903  0.903  0.903  1.0
  Fe  Fe13  1  0.658  0.155  0.658  1.0
  Fe  Fe14  1  0.155  0.658  0.658  1.0
  Fe  Fe15  1  0.658  0.658  0.155  1.0
  Fe  Fe16  1  0.343  0.845  0.343  1.0
  Fe  Fe17  1  0.845  0.343  0.343  1.0
  Fe  Fe18  1  0.343  0.343  0.845  1.0
[/CIF]
.