The structure described by Al2O3 crystallizes in the monoclinic C2/m space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent O(1) and three equivalent O(2) atoms to form a mixture of distorted corner and edge-sharing AlO5 trigonal bipyramids. In the second Al site, Al(2) is bonded to one O(1), one O(2), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing AlO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Al(2) and two equivalent Al(1) atoms. In the second O site, O(2) is bonded to one Al(2) and three equivalent Al(1) atoms to form a mixture of distorted corner and edge-sharing OAl4 trigonal pyramids. In the third O site, O(3) is bonded in a T-shaped geometry to three equivalent Al(2) atoms. is represented by the CIF file [CIF]
data_Al2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.733
_cell_length_b   3.270
_cell_length_c   10.519
_cell_angle_alpha   90.006
_cell_angle_beta   27.554
_cell_angle_gamma   102.210
_symmetry_Int_Tables_number   1
_cell_volume   109.422
_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
  Al  Al0  1  0.369  0.675  0.200  1.0
  Al  Al1  1  0.211  0.596  0.632  1.0
  Al  Al2  1  0.632  0.306  0.800  1.0
  Al  Al3  1  0.789  0.385  0.368  1.0
  O  O4  1  0.189  0.585  0.478  1.0
  O  O5  1  0.402  0.692  0.976  1.0
  O  O6  1  0.598  0.290  0.024  1.0
  O  O7  1  0.209  0.095  0.702  1.0
  O  O8  1  0.790  0.886  0.298  1.0
  O  O9  1  0.811  0.396  0.522  1.0
[/CIF]
.
The structure described by Al2O3 crystallizes in the monoclinic C2/m space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent O(1) and three equivalent O(2) atoms to form a mixture of distorted corner and edge-sharing AlO5 trigonal bipyramids. In the second Al site, Al(2) is bonded to one O(1), one O(2), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing AlO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Al(2) and two equivalent Al(1) atoms. In the second O site, O(2) is bonded to one Al(2) and three equivalent Al(1) atoms to form a mixture of distorted corner and edge-sharing OAl4 trigonal pyramids. In the third O site, O(3) is bonded in a T-shaped geometry to three equivalent Al(2) atoms. is represented by the CIF file [CIF]
data_Al2O3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.733
_cell_length_b   3.270
_cell_length_c   10.519
_cell_angle_alpha   90.006
_cell_angle_beta   27.554
_cell_angle_gamma   102.210
_symmetry_Int_Tables_number   1
_cell_volume   109.422
_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
  Al  Al0  1  0.369  0.675  0.200  1.0
  Al  Al1  1  0.211  0.596  0.632  1.0
  Al  Al2  1  0.632  0.306  0.800  1.0
  Al  Al3  1  0.789  0.385  0.368  1.0
  O  O4  1  0.189  0.585  0.478  1.0
  O  O5  1  0.402  0.692  0.976  1.0
  O  O6  1  0.598  0.290  0.024  1.0
  O  O7  1  0.209  0.095  0.702  1.0
  O  O8  1  0.790  0.886  0.298  1.0
  O  O9  1  0.811  0.396  0.522  1.0
[/CIF]
.