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In this study, the iron oxide thin films have been produced by chemical bath deposition (CBD) method as a function of pH onto amorphous glass substrates. The surface images of the films were investigated with scanning electron microscope (SEM). The crystal structures, orientation of crystallization, crystallite sizes, and dislocation density i.e. structural properties of the thin films were analyzed with X-ray diffraction (XRD). The optical band gap ([Formula: see text], optical transmission ([Formula: see text]%), reflectivity ([Formula: see text]%), absorption coefficient ([Formula: see text], refraction index ([Formula: see text]), extinction coefficient ([Formula: see text]) and dielectric constant ([Formula: see text]) of the thin films were investigated depending on pH, deposition time, solution temperature, substrate temperature, thickness of the films by UV–VIS spectrometer.