The X-ray diffraction (XRD) profiles of the film specimens were taken using a Philips X’Pert MPD diffractometer (Eindhoven, Netherlands). The specimens were irradiated by Cu Kα (λ = 0.15418 nm) at 40 kV and 30 mA with a symmetric reflection geometry in the range of 2θ = 5–90° with a step of 0.02°.