الخلاصة:
The thin layers of iron oxide -Fe2O3 was prepared from the precursor (FeCl3, 6H2O) and HClhydrochloric acid by the dip-coating method. The developed thin films were subjected to analysis by XRD, IR and UV-Vis.
Several thin layers were developed by varying the concentrations of FeCl3 and HCl in the solutions of the Dip-Coating. The resulting layers have been annealed at different temperatures ranging from 450 °C to 600 °C. The films showed good crystallinity was obtained from a concentration of 3 mol / liter of FeCl3 and 1 mol / liter of HCl and correspond to thermal treatments of 450 °C to 600 °C.
The diffractograms corresponding to the X-rays diffraction were used for microstructural study by the method of Voigt. This analysis is to estimate the average crystallite size of the hematite and the evaluation of micro-strains present in the compound. The crystallites size were found in the field 20-130 nm. Micro-constraints correspond to deformations of from 0.001-0.007. Infrared spectroscopy confirmed the formation of hematite in the thin film crystalline state. UV-Vis spectra revealed that the annealing temperature causes an increase in the transmittance of the thin film of Fe2O3. One gap was observed between the layers obtained without annealing and the layers having a heat treatment
