The structure described by BeAl2O4 is Spinel-like structured and crystallizes in the orthorhombic Pnma space group. Be(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form BeO4 tetrahedra that share corners with two equivalent Al(2)O6 octahedra, corners with four equivalent Al(1)O6 octahedra,  an edgeedge with one Al(1)O6 octahedra, and edges with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-63°. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form AlO6 octahedra that share corners with four equivalent Al(1)O6 octahedra, corners with four equivalent Al(2)O6 octahedra, corners with four equivalent Be(1)O4 tetrahedra, edges with two equivalent Al(2)O6 octahedra, and  an edgeedge with one Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-56°. In the second Al site, Al(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form AlO6 octahedra that share corners with four equivalent Al(1)O6 octahedra, corners with two equivalent Be(1)O4 tetrahedra, edges with two equivalent Al(1)O6 octahedra, edges with two equivalent Al(2)O6 octahedra, and edges with two equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-56°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Be(1), one Al(2), and two equivalent Al(1) atoms. In the second O site, O(2) is bonded to one Be(1), one Al(1), and two equivalent Al(2) atoms to form distorted corner-sharing OBeAl3 tetrahedra. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Be(1), one Al(1), and two equivalent Al(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_BeAl2O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.421
_cell_length_b   5.468
_cell_length_c   9.394
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   227.111
_cell_formula_units_Z   4
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
  Be  Be0  1  0.067  0.250  0.592  1.0
  Be  Be1  1  0.933  0.750  0.408  1.0
  Be  Be2  1  0.433  0.250  0.092  1.0
  Be  Be3  1  0.567  0.750  0.908  1.0
  Al  Al4  1  0.495  0.750  0.227  1.0
  Al  Al5  1  0.995  0.250  0.273  1.0
  Al  Al6  1  0.505  0.250  0.773  1.0
  Al  Al7  1  0.005  0.750  0.727  1.0
  Al  Al8  1  0.500  0.500  0.500  1.0
  Al  Al9  1  0.000  0.500  0.000  1.0
  Al  Al10  1  0.500  0.000  0.500  1.0
  Al  Al11  1  0.000  0.000  0.000  1.0
  O  O12  1  0.757  0.515  0.337  1.0
  O  O13  1  0.257  0.485  0.163  1.0
  O  O14  1  0.243  0.015  0.663  1.0
  O  O15  1  0.743  0.985  0.837  1.0
  O  O16  1  0.257  0.015  0.163  1.0
  O  O17  1  0.243  0.485  0.663  1.0
  O  O18  1  0.757  0.985  0.337  1.0
  O  O19  1  0.743  0.515  0.837  1.0
  O  O20  1  0.213  0.750  0.910  1.0
  O  O21  1  0.713  0.250  0.590  1.0
  O  O22  1  0.787  0.250  0.090  1.0
  O  O23  1  0.287  0.750  0.410  1.0
  O  O24  1  0.759  0.750  0.567  1.0
  O  O25  1  0.259  0.250  0.933  1.0
  O  O26  1  0.241  0.250  0.433  1.0
  O  O27  1  0.741  0.750  0.067  1.0
[/CIF]
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The structure described by BeAl2O4 is Spinel-like structured and crystallizes in the orthorhombic Pnma space group. Be(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form BeO4 tetrahedra that share corners with two equivalent Al(2)O6 octahedra, corners with four equivalent Al(1)O6 octahedra,  an edgeedge with one Al(1)O6 octahedra, and edges with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-63°. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form AlO6 octahedra that share corners with four equivalent Al(1)O6 octahedra, corners with four equivalent Al(2)O6 octahedra, corners with four equivalent Be(1)O4 tetrahedra, edges with two equivalent Al(2)O6 octahedra, and  an edgeedge with one Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-56°. In the second Al site, Al(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form AlO6 octahedra that share corners with four equivalent Al(1)O6 octahedra, corners with two equivalent Be(1)O4 tetrahedra, edges with two equivalent Al(1)O6 octahedra, edges with two equivalent Al(2)O6 octahedra, and edges with two equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-56°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Be(1), one Al(2), and two equivalent Al(1) atoms. In the second O site, O(2) is bonded to one Be(1), one Al(1), and two equivalent Al(2) atoms to form distorted corner-sharing OBeAl3 tetrahedra. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Be(1), one Al(1), and two equivalent Al(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_BeAl2O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.421
_cell_length_b   5.468
_cell_length_c   9.394
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   227.111
_cell_formula_units_Z   4
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
  Be  Be0  1  0.067  0.250  0.592  1.0
  Be  Be1  1  0.933  0.750  0.408  1.0
  Be  Be2  1  0.433  0.250  0.092  1.0
  Be  Be3  1  0.567  0.750  0.908  1.0
  Al  Al4  1  0.495  0.750  0.227  1.0
  Al  Al5  1  0.995  0.250  0.273  1.0
  Al  Al6  1  0.505  0.250  0.773  1.0
  Al  Al7  1  0.005  0.750  0.727  1.0
  Al  Al8  1  0.500  0.500  0.500  1.0
  Al  Al9  1  0.000  0.500  0.000  1.0
  Al  Al10  1  0.500  0.000  0.500  1.0
  Al  Al11  1  0.000  0.000  0.000  1.0
  O  O12  1  0.757  0.515  0.337  1.0
  O  O13  1  0.257  0.485  0.163  1.0
  O  O14  1  0.243  0.015  0.663  1.0
  O  O15  1  0.743  0.985  0.837  1.0
  O  O16  1  0.257  0.015  0.163  1.0
  O  O17  1  0.243  0.485  0.663  1.0
  O  O18  1  0.757  0.985  0.337  1.0
  O  O19  1  0.743  0.515  0.837  1.0
  O  O20  1  0.213  0.750  0.910  1.0
  O  O21  1  0.713  0.250  0.590  1.0
  O  O22  1  0.787  0.250  0.090  1.0
  O  O23  1  0.287  0.750  0.410  1.0
  O  O24  1  0.759  0.750  0.567  1.0
  O  O25  1  0.259  0.250  0.933  1.0
  O  O26  1  0.241  0.250  0.433  1.0
  O  O27  1  0.741  0.750  0.067  1.0
[/CIF]
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