Al2O3 crystallizes in the orthorhombic Pnnm space group. Al(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing AlO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to three equivalent Al(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Al(1) atoms.
Al2O3 crystallizes in the orthorhombic Pnnm space group. Al(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing AlO4 tetrahedra. The Al(1)-O(2) bond length is 1.68 Å. All Al(1)-O(1) bond lengths are 1.82 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to three equivalent Al(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Al(1) atoms.