The material described by SrAu2Al2 crystallizes in the tetragonal P4/nmm space group. Sr(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 to four equivalent Sr(1) and four equivalent Al(2) atoms to form distorted AuSr4Al4 tetrahedra that share corners with twelve equivalent Al(1)Sr4Au4 tetrahedra, edges with two equivalent Al(1)Sr4Au4 tetrahedra, edges with four equivalent Au(1)Sr4Al4 tetrahedra, and faces with four equivalent Au(1)Sr4Al4 tetrahedra. In the second Au site, Au(2) is bonded in a 5-coordinate geometry to four equivalent Sr(1), one Al(2), and four equivalent Al(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Sr(1) and four equivalent Au(2) atoms to form distorted AlSr4Au4 tetrahedra that share corners with twelve equivalent Au(1)Sr4Al4 tetrahedra, edges with two equivalent Au(1)Sr4Al4 tetrahedra, edges with four equivalent Al(1)Sr4Au4 tetrahedra, and faces with four equivalent Al(1)Sr4Au4 tetrahedra. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to four equivalent Sr(1), one Au(2), and four equivalent Au(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr(AlAu)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.488
_cell_length_b   4.488
_cell_length_c   10.539
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   212.270
_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
  Sr  Sr0  1  0.000  0.500  0.249  1.0
  Sr  Sr1  1  0.500  0.000  0.751  1.0
  Al  Al2  1  0.000  0.000  0.500  1.0
  Al  Al3  1  0.500  0.500  0.500  1.0
  Al  Al4  1  0.000  0.500  0.876  1.0
  Al  Al5  1  0.500  0.000  0.124  1.0
  Au  Au6  1  0.000  0.000  0.000  1.0
  Au  Au7  1  0.500  0.500  0.000  1.0
  Au  Au8  1  0.000  0.500  0.629  1.0
  Au  Au9  1  0.500  0.000  0.371  1.0
[/CIF]
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The material described by SrAu2Al2 crystallizes in the tetragonal P4/nmm space group. Sr(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 to four equivalent Sr(1) and four equivalent Al(2) atoms to form distorted AuSr4Al4 tetrahedra that share corners with twelve equivalent Al(1)Sr4Au4 tetrahedra, edges with two equivalent Al(1)Sr4Au4 tetrahedra, edges with four equivalent Au(1)Sr4Al4 tetrahedra, and faces with four equivalent Au(1)Sr4Al4 tetrahedra. In the second Au site, Au(2) is bonded in a 5-coordinate geometry to four equivalent Sr(1), one Al(2), and four equivalent Al(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Sr(1) and four equivalent Au(2) atoms to form distorted AlSr4Au4 tetrahedra that share corners with twelve equivalent Au(1)Sr4Al4 tetrahedra, edges with two equivalent Au(1)Sr4Al4 tetrahedra, edges with four equivalent Al(1)Sr4Au4 tetrahedra, and faces with four equivalent Al(1)Sr4Au4 tetrahedra. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to four equivalent Sr(1), one Au(2), and four equivalent Au(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr(AlAu)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.488
_cell_length_b   4.488
_cell_length_c   10.539
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   212.270
_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
  Sr  Sr0  1  0.000  0.500  0.249  1.0
  Sr  Sr1  1  0.500  0.000  0.751  1.0
  Al  Al2  1  0.000  0.000  0.500  1.0
  Al  Al3  1  0.500  0.500  0.500  1.0
  Al  Al4  1  0.000  0.500  0.876  1.0
  Al  Al5  1  0.500  0.000  0.124  1.0
  Au  Au6  1  0.000  0.000  0.000  1.0
  Au  Au7  1  0.500  0.500  0.000  1.0
  Au  Au8  1  0.000  0.500  0.629  1.0
  Au  Au9  1  0.500  0.000  0.371  1.0
[/CIF]
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