Synthesis And Electrical Properties Studies Of Zr_1-xMg_xO_2-x（0.06≤x≤0.2） Solid Electrolytes

Manganese is an important element in iron and steel, it plays a significant role in the performance of steel. Steel possesses good hardness and high strength with proper manganese content. Control of manganese concentration is very important in the steelmaking process of high manganese steel, variation of manganese concentration is complex in molten iron, the present sampling analysis is complex and information lags, so manganese sensor which provides real-time monitoring of manganese content is needed for research and development. Zirconia has high strength and density, its conductivity can be enhanced with dopant, it is an appropriate probe material for manganese sensors. So zirconia doped with different amount of magnesia was synthesized respectively and properties were investigated to explore the optimal amount of dopant for farther application in manganese sensor.The following results were obtained through the materials’synthesis and characterization of performance.1. The mixed powder of zirconia doped with different molar fraction of magnesia was prepared separately, pressed samples were sintered at1600℃for10h. XRD patterns analysis revealed the coexistence of cubic solid solution phase, cubic phase and monoclinic phase in synthesized Zr1-xMgxO2-x solid electrolyte when amount the dopant was between0.06to0.09molar fractions, the expected solid electrolyte was synthesized.2. The densities of the calcined samples of Zr1-xMgxO2-x were higher to90%of their theoretical densities. SEM analysis showed that microstructure of Zr1-xMgxO2-x was compact, MgO has been successfully doped into ZiO2, and solid solution phase was formed. With good compactness Zr1-xMgxO2-x could be used for solid electrolyte probe.3. Electrical properties of Zr1-xMgxO2-x solid electrolyte were investigated over the alternating current impedance spectroscopy, conductivities under different temperature were obtained, the result demonstrated that ionic conductivity increased with an increase of dopant concentration or temperature. Considering the structure, conductivity and other factors, it was found that the optimum dopant concentration was0.07molar fraction.4. Arrhenius equation and conductive activation energy of Zr1-xMgxO2-x doped with different amount of MgO between different temperature ranges were obtained through the analysis and discussion of experimental results.