The material structure described by EuAu2Al2 crystallizes in the tetragonal P4/nmm space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Au(1), four equivalent Au(2), four equivalent Al(1), and four equivalent Al(2) atoms. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 5-coordinate geometry to four equivalent Eu(1), one Al(1), and four equivalent Al(2) atoms. In the second Au site, Au(2) is bonded to four equivalent Eu(1) and four equivalent Al(1) atoms to form distorted AuEu4Al4 tetrahedra that share corners with twelve equivalent Al(2)Eu4Au4 tetrahedra, edges with two equivalent Al(2)Eu4Au4 tetrahedra, edges with four equivalent Au(2)Eu4Al4 tetrahedra, and faces with four equivalent Au(2)Eu4Al4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 5-coordinate geometry to four equivalent Eu(1), one Au(1), and four equivalent Au(2) atoms. In the second Al site, Al(2) is bonded to four equivalent Eu(1) and four equivalent Au(1) atoms to form distorted AlEu4Au4 tetrahedra that share corners with twelve equivalent Au(2)Eu4Al4 tetrahedra, edges with two equivalent Au(2)Eu4Al4 tetrahedra, edges with four equivalent Al(2)Eu4Au4 tetrahedra, and faces with four equivalent Al(2)Eu4Au4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu(AlAu)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.432
_cell_length_b   4.432
_cell_length_c   10.481
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   205.876
_cell_formula_units_Z   2
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  0.750  0.750  0.751  1.0
  Eu  Eu1  1  0.250  0.250  0.249  1.0
  Al  Al2  1  0.750  0.750  0.128  1.0
  Al  Al3  1  0.250  0.250  0.872  1.0
  Al  Al4  1  0.750  0.250  0.500  1.0
  Al  Al5  1  0.250  0.750  0.500  1.0
  Au  Au6  1  0.750  0.750  0.370  1.0
  Au  Au7  1  0.250  0.250  0.630  1.0
  Au  Au8  1  0.750  0.250  0.000  1.0
  Au  Au9  1  0.250  0.750  0.000  1.0
[/CIF]
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The material structure described by EuAu2Al2 crystallizes in the tetragonal P4/nmm space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Au(1), four equivalent Au(2), four equivalent Al(1), and four equivalent Al(2) atoms. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 5-coordinate geometry to four equivalent Eu(1), one Al(1), and four equivalent Al(2) atoms. In the second Au site, Au(2) is bonded to four equivalent Eu(1) and four equivalent Al(1) atoms to form distorted AuEu4Al4 tetrahedra that share corners with twelve equivalent Al(2)Eu4Au4 tetrahedra, edges with two equivalent Al(2)Eu4Au4 tetrahedra, edges with four equivalent Au(2)Eu4Al4 tetrahedra, and faces with four equivalent Au(2)Eu4Al4 tetrahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 5-coordinate geometry to four equivalent Eu(1), one Au(1), and four equivalent Au(2) atoms. In the second Al site, Al(2) is bonded to four equivalent Eu(1) and four equivalent Au(1) atoms to form distorted AlEu4Au4 tetrahedra that share corners with twelve equivalent Au(2)Eu4Al4 tetrahedra, edges with two equivalent Au(2)Eu4Al4 tetrahedra, edges with four equivalent Al(2)Eu4Au4 tetrahedra, and faces with four equivalent Al(2)Eu4Au4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu(AlAu)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.432
_cell_length_b   4.432
_cell_length_c   10.481
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   205.876
_cell_formula_units_Z   2
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  0.750  0.750  0.751  1.0
  Eu  Eu1  1  0.250  0.250  0.249  1.0
  Al  Al2  1  0.750  0.750  0.128  1.0
  Al  Al3  1  0.250  0.250  0.872  1.0
  Al  Al4  1  0.750  0.250  0.500  1.0
  Al  Al5  1  0.250  0.750  0.500  1.0
  Au  Au6  1  0.750  0.750  0.370  1.0
  Au  Au7  1  0.250  0.250  0.630  1.0
  Au  Au8  1  0.750  0.250  0.000  1.0
  Au  Au9  1  0.250  0.750  0.000  1.0
[/CIF]
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