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晶界对多元多晶电解质材料电导率的影响,已成为制约高温固体电解质材料发展的瓶颈.传统的晶界观察方法难以将高温下材料的组织结构与电导性能相对应.鉴于此,本文研究了部分稳定氧化锆(PSZ)固体电解质材料的变温交流阻抗特性,并对交流阻抗谱进行了拟合分析,发现等效拟合电路随温度的上升而发生变化.通过对不同等效电路模型的物理解析,得出PSZ电解质材料显微结构在高温下的演变模型.经进一步分析,演绎出一种‘短程有序,的‘晶界桥接’组织模型,为改善PSZ电解质材料的晶界电导提供了参考.
The influence of grain boundaries on the conductivity of polycrystalline polyelectrolyte materials has become a bottleneck restricting the development of high temperature solid electrolyte materials.Traditional grain boundary observation method is difficult to correspond to the structure and conductivity of materials at high temperature.In view of this, Temperature AC impedance characteristics of partially stabilized zirconia (PSZ) solid electrolyte materials, and fitting analysis of the AC impedance spectroscopy was carried out to find that the equivalent fitting circuit changed with the increase of temperature.By analyzing the physical The evolution model of microstructure of PSZ electrolyte material at high temperature was obtained.After further analysis, a ’short-range and orderly’ bridged grain boundary ’organization model was deduced to provide a new method to improve the grain boundary conductivity of PSZ electrolyte material reference.