“…No mixed phase, such as ZnO or ␣-Fe 2 O 3 peak, was observed in all the films. The crystal constants of the films are 8.383, 8.412 and 8.380Å for the films on the different substrates, respectively, with a slight difference to the value of 8.410Å for the corresponding bulk due to the crystalline lattice mismatch between the films and the substrates [14,15].…”