Al2O3 crystallizes in the monoclinic C2/c space group. Al(1) is bonded to two equivalent O(2) and three equivalent O(1) atoms to form a mixture of edge and corner-sharing AlO5 trigonal bipyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to three equivalent Al(1) atoms. In the second O site, O(2) is bonded in a see-saw-like geometry to four equivalent Al(1) atoms.
Al2O3 crystallizes in the monoclinic C2/c space group. Al(1) is bonded to two equivalent O(2) and three equivalent O(1) atoms to form a mixture of edge and corner-sharing AlO5 trigonal bipyramids. There is one shorter (1.88 Å) and one longer (2.02 Å) Al(1)-O(2) bond length. There are two shorter (1.78 Å) and one longer (1.89 Å) Al(1)-O(1) bond length. There are two inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to three equivalent Al(1) atoms. In the second O site, O(2) is bonded in a see-saw-like geometry to four equivalent Al(1) atoms.