The material described by Nd2FeCo17Si8 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the orthorhombic Fmmm space group. Nd(1) is bonded in a 24-coordinate geometry to four equivalent Co(1), four equivalent Co(2), four equivalent Co(3), four equivalent Co(4), four equivalent Si(1), and four equivalent Si(2) atoms. Fe(1) is bonded to four equivalent Co(2), four equivalent Co(3), and four equivalent Si(1) atoms to form FeCo8Si4 cuboctahedra that share corners with four equivalent Co(4)Nd2Co6Si4 cuboctahedra, faces with four equivalent Co(4)Nd2Co6Si4 cuboctahedra, and faces with four equivalent Co(3)Nd2FeCo5Si4 cuboctahedra. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Co(5), two equivalent Co(2), two equivalent Co(4), two equivalent Si(1), and two equivalent Si(2) atoms. In the second Co site, Co(2) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Fe(1), two equivalent Co(1), two equivalent Co(3), two equivalent Si(1), and two equivalent Si(2) atoms. In the third Co site, Co(3) is bonded to two equivalent Nd(1), one Fe(1), one Co(3), two equivalent Co(2), two equivalent Co(4), two equivalent Si(1), and two equivalent Si(2) atoms to form distorted CoNd2FeCo5Si4 cuboctahedra that share  a cornercorner with one Co(5)Co8Si4 cuboctahedra, corners with five equivalent Co(3)Nd2FeCo5Si4 cuboctahedra, corners with six equivalent Co(4)Nd2Co6Si4 cuboctahedra,  a faceface with one Fe(1)Co8Si4 cuboctahedra,  a faceface with one Co(5)Co8Si4 cuboctahedra, faces with three equivalent Co(3)Nd2FeCo5Si4 cuboctahedra, and faces with four equivalent Co(4)Nd2Co6Si4 cuboctahedra. In the fourth Co site, Co(4) is bonded to two equivalent Nd(1), one Co(4), one Co(5), two equivalent Co(1), two equivalent Co(3), two equivalent Si(1), and two equivalent Si(2) atoms to form distorted CoNd2Co6Si4 cuboctahedra that share  a cornercorner with one Fe(1)Co8Si4 cuboctahedra, corners with five equivalent Co(4)Nd2Co6Si4 cuboctahedra, corners with six equivalent Co(3)Nd2FeCo5Si4 cuboctahedra,  a faceface with one Fe(1)Co8Si4 cuboctahedra,  a faceface with one Co(5)Co8Si4 cuboctahedra, faces with three equivalent Co(4)Nd2Co6Si4 cuboctahedra, and faces with four equivalent Co(3)Nd2FeCo5Si4 cuboctahedra. In the fifth Co site, Co(5) is bonded to four equivalent Co(1), four equivalent Co(4), and four equivalent Si(2) atoms to form CoCo8Si4 cuboctahedra that share corners with four equivalent Co(3)Nd2FeCo5Si4 cuboctahedra, faces with four equivalent Co(4)Nd2Co6Si4 cuboctahedra, and faces with four equivalent Co(3)Nd2FeCo5Si4 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Fe(1), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), and two equivalent Co(4) atoms. In the second Si site, Si(2) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Co(5), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), two equivalent Co(4), and one Si(2) atom. is represented by the CIF card [CIF]
data_Nd2FeCo17Si8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.947
_cell_length_b   7.937
_cell_length_c   7.751
_cell_angle_alpha   60.856
_cell_angle_beta   60.727
_cell_angle_gamma   58.417
_symmetry_Int_Tables_number   1
_cell_volume   345.337
_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  0.250  0.250  1.0
  Nd  Nd1  1  0.750  0.750  0.750  1.0
  Fe  Fe2  1  0.000  0.000  0.000  1.0
  Co  Co3  1  0.448  0.191  0.809  1.0
  Co  Co4  1  0.191  0.448  0.552  1.0
  Co  Co5  1  0.949  0.691  0.051  1.0
  Co  Co6  1  0.691  0.949  0.309  1.0
  Co  Co7  1  0.552  0.809  0.191  1.0
  Co  Co8  1  0.809  0.552  0.448  1.0
  Co  Co9  1  0.051  0.309  0.949  1.0
  Co  Co10  1  0.309  0.051  0.691  1.0
  Co  Co11  1  0.701  0.299  0.069  1.0
  Co  Co12  1  0.299  0.701  0.931  1.0
  Co  Co13  1  0.200  0.800  0.430  1.0
  Co  Co14  1  0.800  0.200  0.570  1.0
  Co  Co15  1  0.430  0.570  0.200  1.0
  Co  Co16  1  0.570  0.430  0.800  1.0
  Co  Co17  1  0.069  0.931  0.701  1.0
  Co  Co18  1  0.931  0.069  0.299  1.0
  Co  Co19  1  0.500  0.500  0.500  1.0
  Si  Si20  1  0.708  0.047  0.953  1.0
  Si  Si21  1  0.047  0.708  0.292  1.0
  Si  Si22  1  0.209  0.548  0.791  1.0
  Si  Si23  1  0.548  0.209  0.452  1.0
  Si  Si24  1  0.292  0.953  0.047  1.0
  Si  Si25  1  0.953  0.292  0.708  1.0
  Si  Si26  1  0.791  0.452  0.209  1.0
  Si  Si27  1  0.452  0.791  0.548  1.0
[/CIF]
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The material described by Nd2FeCo17Si8 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the orthorhombic Fmmm space group. Nd(1) is bonded in a 24-coordinate geometry to four equivalent Co(1), four equivalent Co(2), four equivalent Co(3), four equivalent Co(4), four equivalent Si(1), and four equivalent Si(2) atoms. Fe(1) is bonded to four equivalent Co(2), four equivalent Co(3), and four equivalent Si(1) atoms to form FeCo8Si4 cuboctahedra that share corners with four equivalent Co(4)Nd2Co6Si4 cuboctahedra, faces with four equivalent Co(4)Nd2Co6Si4 cuboctahedra, and faces with four equivalent Co(3)Nd2FeCo5Si4 cuboctahedra. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Co(5), two equivalent Co(2), two equivalent Co(4), two equivalent Si(1), and two equivalent Si(2) atoms. In the second Co site, Co(2) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Fe(1), two equivalent Co(1), two equivalent Co(3), two equivalent Si(1), and two equivalent Si(2) atoms. In the third Co site, Co(3) is bonded to two equivalent Nd(1), one Fe(1), one Co(3), two equivalent Co(2), two equivalent Co(4), two equivalent Si(1), and two equivalent Si(2) atoms to form distorted CoNd2FeCo5Si4 cuboctahedra that share  a cornercorner with one Co(5)Co8Si4 cuboctahedra, corners with five equivalent Co(3)Nd2FeCo5Si4 cuboctahedra, corners with six equivalent Co(4)Nd2Co6Si4 cuboctahedra,  a faceface with one Fe(1)Co8Si4 cuboctahedra,  a faceface with one Co(5)Co8Si4 cuboctahedra, faces with three equivalent Co(3)Nd2FeCo5Si4 cuboctahedra, and faces with four equivalent Co(4)Nd2Co6Si4 cuboctahedra. In the fourth Co site, Co(4) is bonded to two equivalent Nd(1), one Co(4), one Co(5), two equivalent Co(1), two equivalent Co(3), two equivalent Si(1), and two equivalent Si(2) atoms to form distorted CoNd2Co6Si4 cuboctahedra that share  a cornercorner with one Fe(1)Co8Si4 cuboctahedra, corners with five equivalent Co(4)Nd2Co6Si4 cuboctahedra, corners with six equivalent Co(3)Nd2FeCo5Si4 cuboctahedra,  a faceface with one Fe(1)Co8Si4 cuboctahedra,  a faceface with one Co(5)Co8Si4 cuboctahedra, faces with three equivalent Co(4)Nd2Co6Si4 cuboctahedra, and faces with four equivalent Co(3)Nd2FeCo5Si4 cuboctahedra. In the fifth Co site, Co(5) is bonded to four equivalent Co(1), four equivalent Co(4), and four equivalent Si(2) atoms to form CoCo8Si4 cuboctahedra that share corners with four equivalent Co(3)Nd2FeCo5Si4 cuboctahedra, faces with four equivalent Co(4)Nd2Co6Si4 cuboctahedra, and faces with four equivalent Co(3)Nd2FeCo5Si4 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Fe(1), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), and two equivalent Co(4) atoms. In the second Si site, Si(2) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Co(5), two equivalent Co(1), two equivalent Co(2), two equivalent Co(3), two equivalent Co(4), and one Si(2) atom. is represented by the CIF card [CIF]
data_Nd2FeCo17Si8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.947
_cell_length_b   7.937
_cell_length_c   7.751
_cell_angle_alpha   60.856
_cell_angle_beta   60.727
_cell_angle_gamma   58.417
_symmetry_Int_Tables_number   1
_cell_volume   345.337
_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  0.250  0.250  1.0
  Nd  Nd1  1  0.750  0.750  0.750  1.0
  Fe  Fe2  1  0.000  0.000  0.000  1.0
  Co  Co3  1  0.448  0.191  0.809  1.0
  Co  Co4  1  0.191  0.448  0.552  1.0
  Co  Co5  1  0.949  0.691  0.051  1.0
  Co  Co6  1  0.691  0.949  0.309  1.0
  Co  Co7  1  0.552  0.809  0.191  1.0
  Co  Co8  1  0.809  0.552  0.448  1.0
  Co  Co9  1  0.051  0.309  0.949  1.0
  Co  Co10  1  0.309  0.051  0.691  1.0
  Co  Co11  1  0.701  0.299  0.069  1.0
  Co  Co12  1  0.299  0.701  0.931  1.0
  Co  Co13  1  0.200  0.800  0.430  1.0
  Co  Co14  1  0.800  0.200  0.570  1.0
  Co  Co15  1  0.430  0.570  0.200  1.0
  Co  Co16  1  0.570  0.430  0.800  1.0
  Co  Co17  1  0.069  0.931  0.701  1.0
  Co  Co18  1  0.931  0.069  0.299  1.0
  Co  Co19  1  0.500  0.500  0.500  1.0
  Si  Si20  1  0.708  0.047  0.953  1.0
  Si  Si21  1  0.047  0.708  0.292  1.0
  Si  Si22  1  0.209  0.548  0.791  1.0
  Si  Si23  1  0.548  0.209  0.452  1.0
  Si  Si24  1  0.292  0.953  0.047  1.0
  Si  Si25  1  0.953  0.292  0.708  1.0
  Si  Si26  1  0.791  0.452  0.209  1.0
  Si  Si27  1  0.452  0.791  0.548  1.0
[/CIF]
.