“…The properties of a-Fe 2 O 3 are crystalplane dependent and the most studied surface is (001), which is found to be Fe terminated and remains unreconstructed even at high oxygen pressures [14]. g-Fe 2 O 3 has been studied for use as magnetic recording medium and also for possible use in gas sensors for organic vapors and hydrogen where it can be used without a noble metal catalyst [10,13,15,16].…”