AlO2 crystallizes in the orthorhombic Pnma space group. Al(1) is bonded to two equivalent O(1) and three equivalent O(2) atoms to form distorted corner-sharing AlO5 trigonal bipyramids. There are two inequivalent O sites. In the first O site, O(2) is bonded in a trigonal planar geometry to three equivalent Al(1) atoms. In the second O site, O(1) is bonded in a linear geometry to two equivalent Al(1) atoms.
AlO2 crystallizes in the orthorhombic Pnma space group. Al(1) is bonded to two equivalent O(1) and three equivalent O(2) atoms to form distorted corner-sharing AlO5 trigonal bipyramids. Both Al(1)-O(1) bond lengths are 1.81 Å. There is one shorter (1.84 Å) and two longer (1.89 Å) Al(1)-O(2) bond lengths. There are two inequivalent O sites. In the first O site, O(2) is bonded in a trigonal planar geometry to three equivalent Al(1) atoms. In the second O site, O(1) is bonded in a linear geometry to two equivalent Al(1) atoms.