The crystal structure described by YbFe4Al8 crystallizes in the tetragonal I4/mmm space group. Yb(1) is bonded in a 20-coordinate geometry to eight equivalent Fe(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Fe(1) is bonded to two equivalent Yb(1), two equivalent Fe(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted edge, face, and corner-sharing FeYb2Al8Fe2 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Yb(1), four equivalent Fe(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Yb(1), four equivalent Fe(1), two equivalent Al(2), and four equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_Yb(Al2Fe)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.031
_cell_length_b   6.628
_cell_length_c   6.628
_cell_angle_alpha   81.719
_cell_angle_beta   67.696
_cell_angle_gamma   67.696
_symmetry_Int_Tables_number   1
_cell_volume   189.159
_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
  Yb  Yb0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.000  0.338  0.662  1.0
  Al  Al2  1  0.000  0.662  0.338  1.0
  Al  Al3  1  0.662  0.338  0.338  1.0
  Al  Al4  1  0.338  0.662  0.662  1.0
  Al  Al5  1  0.500  0.775  0.225  1.0
  Al  Al6  1  0.500  0.225  0.775  1.0
  Al  Al7  1  0.725  0.775  0.775  1.0
  Al  Al8  1  0.275  0.225  0.225  1.0
  Fe  Fe9  1  0.000  0.000  0.500  1.0
  Fe  Fe10  1  0.500  0.000  0.500  1.0
  Fe  Fe11  1  0.500  0.500  0.000  1.0
  Fe  Fe12  1  0.000  0.500  0.000  1.0
[/CIF]
.
The crystal structure described by YbFe4Al8 crystallizes in the tetragonal I4/mmm space group. Yb(1) is bonded in a 20-coordinate geometry to eight equivalent Fe(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Fe(1) is bonded to two equivalent Yb(1), two equivalent Fe(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted edge, face, and corner-sharing FeYb2Al8Fe2 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Yb(1), four equivalent Fe(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Yb(1), four equivalent Fe(1), two equivalent Al(2), and four equivalent Al(1) atoms. is represented by the CIF file [CIF]
data_Yb(Al2Fe)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.031
_cell_length_b   6.628
_cell_length_c   6.628
_cell_angle_alpha   81.719
_cell_angle_beta   67.696
_cell_angle_gamma   67.696
_symmetry_Int_Tables_number   1
_cell_volume   189.159
_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
  Yb  Yb0  1  0.000  0.000  0.000  1.0
  Al  Al1  1  0.000  0.338  0.662  1.0
  Al  Al2  1  0.000  0.662  0.338  1.0
  Al  Al3  1  0.662  0.338  0.338  1.0
  Al  Al4  1  0.338  0.662  0.662  1.0
  Al  Al5  1  0.500  0.775  0.225  1.0
  Al  Al6  1  0.500  0.225  0.775  1.0
  Al  Al7  1  0.725  0.775  0.775  1.0
  Al  Al8  1  0.275  0.225  0.225  1.0
  Fe  Fe9  1  0.000  0.000  0.500  1.0
  Fe  Fe10  1  0.500  0.000  0.500  1.0
  Fe  Fe11  1  0.500  0.500  0.000  1.0
  Fe  Fe12  1  0.000  0.500  0.000  1.0
[/CIF]
.