中文摘要：

为了抑制0.5Bi0.5TiO3的退极化现象,提高铁电性能,以K2CO3、TiO2、Bi2O3及ZnO为原料,通过二步固相法合成无铅铁电复合陶瓷0.5Bi0.5TiO3：ZnO （KBT：ZnO）. 通过X射线衍射、扫描电子显微镜、铁电和介电测试分析了复合陶瓷的微观结构和介电行为. 结果表明：KBT中引入20%（物质的量百分数）的ZnO后,复合陶瓷中生成了第三相Zn2TiO4,同时,KBT的极化能力及其铁电行为得到改善. 阻抗测试表明复合铁电陶瓷内部只存在一种导电机制,即电子电导. 特别是ZnO的引入抑制了KBT由正常铁电体向弛豫铁电体的相转变,对KBT的应用和研究有着重要的作用.

英文摘要：

To suppress the depolarization phenomenon of K0.5Bi0.5TiO3 and improve the ferroelectric properties, lead-free ferroelectric ceramic composite K0.5Bi0.5TiO3：ZnO （KBT：ZnO） was prepared by two-step solid phase synthesis, using K2CO3, Na2CO3, Bi2O3 and ZnO as raw materials. The microstructure and electric properties of the composite ceramic were analyzed by X-ray diffraction, scanning electron microscopy, ferroelectric and dielectric tests. The results show that the incorporation of 20%（in mole percent） ZnO leads to the formation of the third phase Zn2TiO4 compared with pure KBT phase, and improves the polarizability and ferroelectricity of KBT. Impedance analysis shows that there is only electronic conduction in the ferroelectric composite ceramics. Especially, the incorporation of ZnO suppressed the phase transition of the normal ferroelectric into relaxation ferroelectric, which is of importance for the research and application of KBT-based materials.