Studies On Structure And Properties Of Ferric Oxide Doped Zirconia Solid Electrolyte

Zirconia-based solid electrolytes are one of important quick conductor materials, which posses high ion conductivity and excellent structure stability. Therefore, they have become the first candidate materials used in solid oxygen fuel cell and oxygen sensors. Zirconium oxide solid electrolyte doped with two prices or three price oxide compounds (for example CaO, MgO, Y2O3 and other rare earth oxide compound) one the most intensively investigated solid electrolytes in the in the metallurgy production and in the high temperature metallurgy physical chemistry research.Ziconia oxide solid electrolytes doped with MgO and Fe2O3 were synthesized by using the solid-state reaction method. The phase structure and microstructure were analysized by X-raydiffraction (XRD) and scanning electron microscopy (SEM). The effects of additives and preparation process to the properties and microstructures were discussed in detail.The XRD test results showed that the single use of ferric oxide was not effective in the synthesis of stabilized zirconia but the combination of MgO with Fe2O3 had a coordinated effect in improving stablization. The special grid shape crystal forms were discovered in the samples doped with Fe2O3 through the SEM test results, and the content of the grid shape crystal form has a dose-dependent manner with doping levels of Fe2O3. In addition, it was found that the sample with 0.3wt% Fe2O3 obtained higher sintering density.The impedance characterization ZrO2 materials doped with Fe2O3 and MgO was studied by means of AC complex impedance technique. It is shown that, with increasing Fe2O3 content in the system, the conductive characteristics of Zirconia-based solid electrolytes have a significant change, increase of the ratio of electronic conductivity at low temperature.