The material described by Dy2Fe17C crystallizes in the monoclinic C2/m space group. Dy(1) is bonded in a distorted single-bond geometry to one Fe(1), one Fe(6), two equivalent Fe(7), four equivalent Fe(5), six equivalent Fe(3), and one C(1) atom. There are seven inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 14-coordinate geometry to one Dy(1), one Fe(1), one Fe(2), one Fe(6), two equivalent Fe(3), two equivalent Fe(4), two equivalent Fe(7), and four equivalent Fe(5) atoms. In the second Fe site, Fe(2) is bonded in a single-bond geometry to one Fe(1), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(7), and one C(1) atom. In the third Fe site, Fe(3) is bonded to three equivalent Dy(1), one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(6), one Fe(7), and three equivalent Fe(5) atoms to form FeDy3Fe9 cuboctahedra that share  a cornercorner with one Fe(6)Dy2Fe10 cuboctahedra, corners with four equivalent Fe(7)Dy2Fe10 cuboctahedra, corners with seven equivalent Fe(3)Dy3Fe9 cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra,  an edgeedge with one Fe(6)Dy2Fe10 cuboctahedra, edges with two equivalent Fe(7)Dy2Fe10 cuboctahedra, edges with three equivalent Fe(3)Dy3Fe9 cuboctahedra,  a faceface with one Fe(6)Dy2Fe10 cuboctahedra, faces with two equivalent Fe(7)Dy2Fe10 cuboctahedra, faces with four equivalent Fe(3)Dy3Fe9 cuboctahedra, and  a faceface with one C(1)Dy2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 65-70°. In the fourth Fe site, Fe(4) is bonded in a single-bond geometry to two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(7), and one C(1) atom. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to two equivalent Dy(1), one Fe(2), one Fe(4), one Fe(5), one Fe(6), one Fe(7), two equivalent Fe(1), and three equivalent Fe(3) atoms. In the sixth Fe site, Fe(6) is bonded to two equivalent Dy(1), two equivalent Fe(1), four equivalent Fe(3), and four equivalent Fe(5) atoms to form FeDy2Fe10 cuboctahedra that share corners with four equivalent Fe(7)Dy2Fe10 cuboctahedra, corners with four equivalent Fe(3)Dy3Fe9 cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra, edges with four equivalent Fe(3)Dy3Fe9 cuboctahedra, faces with four equivalent Fe(7)Dy2Fe10 cuboctahedra, and faces with four equivalent Fe(3)Dy3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 44°. In the seventh Fe site, Fe(7) is bonded to two equivalent Dy(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and two equivalent Fe(5) atoms to form distorted FeDy2Fe10 cuboctahedra that share corners with two equivalent Fe(6)Dy2Fe10 cuboctahedra, corners with two equivalent Fe(7)Dy2Fe10 cuboctahedra, corners with eight equivalent Fe(3)Dy3Fe9 cuboctahedra, edges with four equivalent Fe(3)Dy3Fe9 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe10 cuboctahedra, faces with two equivalent Fe(7)Dy2Fe10 cuboctahedra, faces with four equivalent Fe(3)Dy3Fe9 cuboctahedra, and faces with two equivalent C(1)Dy2Fe4 octahedra. C(1) is bonded to two equivalent Dy(1), two equivalent Fe(2), and two equivalent Fe(4) atoms to form CDy2Fe4 octahedra that share corners with two equivalent Fe(6)Dy2Fe10 cuboctahedra, corners with eight equivalent Fe(3)Dy3Fe9 cuboctahedra, faces with four equivalent Fe(7)Dy2Fe10 cuboctahedra, and faces with four equivalent Fe(3)Dy3Fe9 cuboctahedra. is represented by the CIF file [CIF]
data_Dy2Fe17C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.440
_cell_length_b   6.440
_cell_length_c   6.412
_cell_angle_alpha   83.340
_cell_angle_beta   83.340
_cell_angle_gamma   83.629
_symmetry_Int_Tables_number   1
_cell_volume   261.032
_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
  Dy  Dy0  1  0.660  0.660  0.652  1.0
  Dy  Dy1  1  0.340  0.340  0.348  1.0
  Fe  Fe2  1  0.903  0.903  0.903  1.0
  Fe  Fe3  1  0.097  0.097  0.097  1.0
  Fe  Fe4  1  0.343  0.343  0.849  1.0
  Fe  Fe5  1  0.343  0.849  0.344  1.0
  Fe  Fe6  1  0.849  0.343  0.344  1.0
  Fe  Fe7  1  0.657  0.657  0.151  1.0
  Fe  Fe8  1  0.657  0.151  0.656  1.0
  Fe  Fe9  1  0.151  0.657  0.656  1.0
  Fe  Fe10  1  0.285  0.715  0.000  1.0
  Fe  Fe11  1  0.710  0.000  0.290  1.0
  Fe  Fe12  1  1.000  0.290  0.710  1.0
  Fe  Fe13  1  0.290  1.000  0.710  1.0
  Fe  Fe14  1  0.000  0.710  0.290  1.0
  Fe  Fe15  1  0.715  0.285  0.000  1.0
  Fe  Fe16  1  0.000  0.000  0.500  1.0
  Fe  Fe17  1  0.000  0.500  0.000  1.0
  Fe  Fe18  1  0.500  0.000  0.000  1.0
  C  C19  1  0.500  0.500  0.000  1.0
[/CIF]
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The material described by Dy2Fe17C crystallizes in the monoclinic C2/m space group. Dy(1) is bonded in a distorted single-bond geometry to one Fe(1), one Fe(6), two equivalent Fe(7), four equivalent Fe(5), six equivalent Fe(3), and one C(1) atom. There are seven inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 14-coordinate geometry to one Dy(1), one Fe(1), one Fe(2), one Fe(6), two equivalent Fe(3), two equivalent Fe(4), two equivalent Fe(7), and four equivalent Fe(5) atoms. In the second Fe site, Fe(2) is bonded in a single-bond geometry to one Fe(1), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(7), and one C(1) atom. In the third Fe site, Fe(3) is bonded to three equivalent Dy(1), one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(6), one Fe(7), and three equivalent Fe(5) atoms to form FeDy3Fe9 cuboctahedra that share  a cornercorner with one Fe(6)Dy2Fe10 cuboctahedra, corners with four equivalent Fe(7)Dy2Fe10 cuboctahedra, corners with seven equivalent Fe(3)Dy3Fe9 cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra,  an edgeedge with one Fe(6)Dy2Fe10 cuboctahedra, edges with two equivalent Fe(7)Dy2Fe10 cuboctahedra, edges with three equivalent Fe(3)Dy3Fe9 cuboctahedra,  a faceface with one Fe(6)Dy2Fe10 cuboctahedra, faces with two equivalent Fe(7)Dy2Fe10 cuboctahedra, faces with four equivalent Fe(3)Dy3Fe9 cuboctahedra, and  a faceface with one C(1)Dy2Fe4 octahedra. The corner-sharing octahedral tilt angles range from 65-70°. In the fourth Fe site, Fe(4) is bonded in a single-bond geometry to two equivalent Fe(1), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(7), and one C(1) atom. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to two equivalent Dy(1), one Fe(2), one Fe(4), one Fe(5), one Fe(6), one Fe(7), two equivalent Fe(1), and three equivalent Fe(3) atoms. In the sixth Fe site, Fe(6) is bonded to two equivalent Dy(1), two equivalent Fe(1), four equivalent Fe(3), and four equivalent Fe(5) atoms to form FeDy2Fe10 cuboctahedra that share corners with four equivalent Fe(7)Dy2Fe10 cuboctahedra, corners with four equivalent Fe(3)Dy3Fe9 cuboctahedra, corners with two equivalent C(1)Dy2Fe4 octahedra, edges with four equivalent Fe(3)Dy3Fe9 cuboctahedra, faces with four equivalent Fe(7)Dy2Fe10 cuboctahedra, and faces with four equivalent Fe(3)Dy3Fe9 cuboctahedra. The corner-sharing octahedral tilt angles are 44°. In the seventh Fe site, Fe(7) is bonded to two equivalent Dy(1), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), and two equivalent Fe(5) atoms to form distorted FeDy2Fe10 cuboctahedra that share corners with two equivalent Fe(6)Dy2Fe10 cuboctahedra, corners with two equivalent Fe(7)Dy2Fe10 cuboctahedra, corners with eight equivalent Fe(3)Dy3Fe9 cuboctahedra, edges with four equivalent Fe(3)Dy3Fe9 cuboctahedra, faces with two equivalent Fe(6)Dy2Fe10 cuboctahedra, faces with two equivalent Fe(7)Dy2Fe10 cuboctahedra, faces with four equivalent Fe(3)Dy3Fe9 cuboctahedra, and faces with two equivalent C(1)Dy2Fe4 octahedra. C(1) is bonded to two equivalent Dy(1), two equivalent Fe(2), and two equivalent Fe(4) atoms to form CDy2Fe4 octahedra that share corners with two equivalent Fe(6)Dy2Fe10 cuboctahedra, corners with eight equivalent Fe(3)Dy3Fe9 cuboctahedra, faces with four equivalent Fe(7)Dy2Fe10 cuboctahedra, and faces with four equivalent Fe(3)Dy3Fe9 cuboctahedra. is represented by the CIF file [CIF]
data_Dy2Fe17C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.440
_cell_length_b   6.440
_cell_length_c   6.412
_cell_angle_alpha   83.340
_cell_angle_beta   83.340
_cell_angle_gamma   83.629
_symmetry_Int_Tables_number   1
_cell_volume   261.032
_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
  Dy  Dy0  1  0.660  0.660  0.652  1.0
  Dy  Dy1  1  0.340  0.340  0.348  1.0
  Fe  Fe2  1  0.903  0.903  0.903  1.0
  Fe  Fe3  1  0.097  0.097  0.097  1.0
  Fe  Fe4  1  0.343  0.343  0.849  1.0
  Fe  Fe5  1  0.343  0.849  0.344  1.0
  Fe  Fe6  1  0.849  0.343  0.344  1.0
  Fe  Fe7  1  0.657  0.657  0.151  1.0
  Fe  Fe8  1  0.657  0.151  0.656  1.0
  Fe  Fe9  1  0.151  0.657  0.656  1.0
  Fe  Fe10  1  0.285  0.715  0.000  1.0
  Fe  Fe11  1  0.710  0.000  0.290  1.0
  Fe  Fe12  1  1.000  0.290  0.710  1.0
  Fe  Fe13  1  0.290  1.000  0.710  1.0
  Fe  Fe14  1  0.000  0.710  0.290  1.0
  Fe  Fe15  1  0.715  0.285  0.000  1.0
  Fe  Fe16  1  0.000  0.000  0.500  1.0
  Fe  Fe17  1  0.000  0.500  0.000  1.0
  Fe  Fe18  1  0.500  0.000  0.000  1.0
  C  C19  1  0.500  0.500  0.000  1.0
[/CIF]
.