The structure described by EuAu4Al8Si crystallizes in the tetragonal P4mm space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Au(4), four equivalent Al(1), four equivalent Al(2), and four equivalent Si(1) atoms. There are four inequivalent Au sites. In the first Au site, Au(1) is bonded in a body-centered cubic geometry to four equivalent Al(3) and four equivalent Al(4) atoms. In the second Au site, Au(2) is bonded in a body-centered cubic geometry to four equivalent Al(1) and four equivalent Al(3) atoms. In the third Au site, Au(3) is bonded in a body-centered cubic geometry to four equivalent Al(2) and four equivalent Al(4) atoms. In the fourth Au site, Au(4) is bonded in a 9-coordinate geometry to four equivalent Eu(1), four equivalent Al(1), and one Si(1) atom. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Eu(1), two equivalent Au(2), and two equivalent Au(4) atoms to form AlEu2Au4 tetrahedra that share corners with two equivalent Al(1)Eu2Au4 tetrahedra, corners with six equivalent Al(3)Au4 tetrahedra, corners with six equivalent Al(2)Eu2Si2Au2 tetrahedra,  an edgeedge with one Al(3)Au4 tetrahedra,  an edgeedge with one Al(2)Eu2Si2Au2 tetrahedra, edges with two equivalent Al(1)Eu2Au4 tetrahedra, and faces with four equivalent Al(1)Eu2Au4 tetrahedra. In the second Al site, Al(2) is bonded to two equivalent Eu(1), two equivalent Au(3), and two equivalent Si(1) atoms to form distorted AlEu2Si2Au2 tetrahedra that share corners with two equivalent Al(2)Eu2Si2Au2 tetrahedra, corners with six equivalent Al(4)Au4 tetrahedra, corners with six equivalent Al(1)Eu2Au4 tetrahedra,  an edgeedge with one Al(4)Au4 tetrahedra,  an edgeedge with one Al(1)Eu2Au4 tetrahedra, edges with two equivalent Al(2)Eu2Si2Au2 tetrahedra, and faces with four equivalent Al(2)Eu2Si2Au2 tetrahedra. In the third Al site, Al(3) is bonded to two equivalent Au(1) and two equivalent Au(2) atoms to form AlAu4 tetrahedra that share corners with four equivalent Al(3)Au4 tetrahedra, corners with six equivalent Al(4)Au4 tetrahedra, corners with six equivalent Al(1)Eu2Au4 tetrahedra,  an edgeedge with one Al(4)Au4 tetrahedra,  an edgeedge with one Al(1)Eu2Au4 tetrahedra, and edges with four equivalent Al(3)Au4 tetrahedra. In the fourth Al site, Al(4) is bonded to two equivalent Au(1) and two equivalent Au(3) atoms to form AlAu4 tetrahedra that share corners with four equivalent Al(4)Au4 tetrahedra, corners with six equivalent Al(3)Au4 tetrahedra, corners with six equivalent Al(2)Eu2Si2Au2 tetrahedra,  an edgeedge with one Al(3)Au4 tetrahedra,  an edgeedge with one Al(2)Eu2Si2Au2 tetrahedra, and edges with four equivalent Al(4)Au4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Au(4), and four equivalent Al(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_EuAl8SiAu4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.295
_cell_length_b   4.295
_cell_length_c   14.473
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   266.960
_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
  Eu  Eu0  1  0.000  0.000  0.006  1.0
  Al  Al1  1  0.500  0.000  0.813  1.0
  Al  Al2  1  0.000  0.500  0.813  1.0
  Al  Al3  1  0.500  0.000  0.190  1.0
  Al  Al4  1  0.000  0.500  0.190  1.0
  Al  Al5  1  0.500  0.000  0.603  1.0
  Al  Al6  1  0.000  0.500  0.603  1.0
  Al  Al7  1  0.500  0.000  0.396  1.0
  Al  Al8  1  0.000  0.500  0.396  1.0
  Si  Si9  1  0.500  0.500  0.083  1.0
  Au  Au10  1  0.500  0.500  0.499  1.0
  Au  Au11  1  0.000  0.000  0.706  1.0
  Au  Au12  1  0.000  0.000  0.290  1.0
  Au  Au13  1  0.500  0.500  0.912  1.0
[/CIF]
.
The structure described by EuAu4Al8Si crystallizes in the tetragonal P4mm space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Au(4), four equivalent Al(1), four equivalent Al(2), and four equivalent Si(1) atoms. There are four inequivalent Au sites. In the first Au site, Au(1) is bonded in a body-centered cubic geometry to four equivalent Al(3) and four equivalent Al(4) atoms. In the second Au site, Au(2) is bonded in a body-centered cubic geometry to four equivalent Al(1) and four equivalent Al(3) atoms. In the third Au site, Au(3) is bonded in a body-centered cubic geometry to four equivalent Al(2) and four equivalent Al(4) atoms. In the fourth Au site, Au(4) is bonded in a 9-coordinate geometry to four equivalent Eu(1), four equivalent Al(1), and one Si(1) atom. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Eu(1), two equivalent Au(2), and two equivalent Au(4) atoms to form AlEu2Au4 tetrahedra that share corners with two equivalent Al(1)Eu2Au4 tetrahedra, corners with six equivalent Al(3)Au4 tetrahedra, corners with six equivalent Al(2)Eu2Si2Au2 tetrahedra,  an edgeedge with one Al(3)Au4 tetrahedra,  an edgeedge with one Al(2)Eu2Si2Au2 tetrahedra, edges with two equivalent Al(1)Eu2Au4 tetrahedra, and faces with four equivalent Al(1)Eu2Au4 tetrahedra. In the second Al site, Al(2) is bonded to two equivalent Eu(1), two equivalent Au(3), and two equivalent Si(1) atoms to form distorted AlEu2Si2Au2 tetrahedra that share corners with two equivalent Al(2)Eu2Si2Au2 tetrahedra, corners with six equivalent Al(4)Au4 tetrahedra, corners with six equivalent Al(1)Eu2Au4 tetrahedra,  an edgeedge with one Al(4)Au4 tetrahedra,  an edgeedge with one Al(1)Eu2Au4 tetrahedra, edges with two equivalent Al(2)Eu2Si2Au2 tetrahedra, and faces with four equivalent Al(2)Eu2Si2Au2 tetrahedra. In the third Al site, Al(3) is bonded to two equivalent Au(1) and two equivalent Au(2) atoms to form AlAu4 tetrahedra that share corners with four equivalent Al(3)Au4 tetrahedra, corners with six equivalent Al(4)Au4 tetrahedra, corners with six equivalent Al(1)Eu2Au4 tetrahedra,  an edgeedge with one Al(4)Au4 tetrahedra,  an edgeedge with one Al(1)Eu2Au4 tetrahedra, and edges with four equivalent Al(3)Au4 tetrahedra. In the fourth Al site, Al(4) is bonded to two equivalent Au(1) and two equivalent Au(3) atoms to form AlAu4 tetrahedra that share corners with four equivalent Al(4)Au4 tetrahedra, corners with six equivalent Al(3)Au4 tetrahedra, corners with six equivalent Al(2)Eu2Si2Au2 tetrahedra,  an edgeedge with one Al(3)Au4 tetrahedra,  an edgeedge with one Al(2)Eu2Si2Au2 tetrahedra, and edges with four equivalent Al(4)Au4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Au(4), and four equivalent Al(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_EuAl8SiAu4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.295
_cell_length_b   4.295
_cell_length_c   14.473
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   266.960
_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
  Eu  Eu0  1  0.000  0.000  0.006  1.0
  Al  Al1  1  0.500  0.000  0.813  1.0
  Al  Al2  1  0.000  0.500  0.813  1.0
  Al  Al3  1  0.500  0.000  0.190  1.0
  Al  Al4  1  0.000  0.500  0.190  1.0
  Al  Al5  1  0.500  0.000  0.603  1.0
  Al  Al6  1  0.000  0.500  0.603  1.0
  Al  Al7  1  0.500  0.000  0.396  1.0
  Al  Al8  1  0.000  0.500  0.396  1.0
  Si  Si9  1  0.500  0.500  0.083  1.0
  Au  Au10  1  0.500  0.500  0.499  1.0
  Au  Au11  1  0.000  0.000  0.706  1.0
  Au  Au12  1  0.000  0.000  0.290  1.0
  Au  Au13  1  0.500  0.500  0.912  1.0
[/CIF]
.