Al2O3 is Corundum-like structured and crystallizes in the cubic Ia-3 space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to six equivalent O(1) atoms to form a mixture of corner and edge-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 51°. In the second Al site, Al(2) is bonded to six equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. O(1) is bonded to one Al(1) and three equivalent Al(2) atoms to form a mixture of corner and edge-sharing OAl4 trigonal pyramids.
Al2O3 is Corundum-like structured and crystallizes in the cubic Ia-3 space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to six equivalent O(1) atoms to form a mixture of corner and edge-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 51°. All Al(1)-O(1) bond lengths are 1.90 Å. In the second Al site, Al(2) is bonded to six equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. There are a spread of Al(2)-O(1) bond distances ranging from 1.85-1.97 Å. O(1) is bonded to one Al(1) and three equivalent Al(2) atoms to form a mixture of corner and edge-sharing OAl4 trigonal pyramids.