Nanocrystalline Fe2O3 was prepared by five different methods. The samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). It is found that pure single-phase of α-Fe2O3 crystal could be gained via thermal decomposition and ultrasonic-precipitation method, while both α-Fe 2O3 and γ-Fe2O3 are obtained by the other methods. The morphologies and particle sizes of the samples obtained are approximate except that by thermal decomposition. Compared to α-Fe2O3...
