ZnO对K0.5Bi0.5TiO3无铅铁电体系介电行为的影响
朱满康，李玲，郭金健，郑木鹏，侯育冬，严辉
（北京工业大学 材料科学与工程学院，北京? 100124）
摘要：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K0.5Bi0.5TiO3: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的影响因素。结果表明： KBT中引入20%ZnO后，复合陶瓷中生成了第三相Zn2TiO4，同时，提高了KBT的极化能力，提高了KBT的铁电性。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，这对KBT的应用和研究有着重要的作用。
关键词：无铅压电陶瓷；钛酸铋钠；钛酸锌；氧化锌
中图分类号：TM22+3 文献标识码：T 文章编号：
Dielectric behavior of K0.5Bi0.5TiO3 lead-free ferroelectric doped with ZnO
ZHU Man-kang, LI Ling, GUO Jin-jian, ZHENG Mu-peng, HOU Yu-dong, YAN Hui
(College of Materials Science and Engineering，Beijing University of Technology，Beijing 100124，China)
Abstract: The lead-free ferroelectric ceramic composite K0.5Bi0.5TiO3:ZnO (KBT:ZnO) were prepared by two-step solid phase synthesis, using K2CO3, Na2CO3, Bi2O3 and ZnO as raw materials. The influencing factors of the microstructure and dielectric behavior of the composite ceramic were analysised by X-ray diffraction, scanning electron microscopy, ferroelectric and dielectric tests . The results show that after the introduction of 20% ZnO, the composite material formed a third phase Zn2TiO4 compared with pure KBT phase, meanwhile, which improved the polarizability and ferroelectricity of KBT. Impedance tests show that composite ferroelectric ceramics only has a kind of conduction mechanism, namely electronic conductivity. In particular, the introduction of ZnO suppressed the phase transition of the normal ferroelectric into relaxation ferroelectric, this plays an important role for KBT application and research.
Key Words: Lead-Free Ferroelectric Ceramic；K0.5Bi0??.5TiO3；Zn2TiO4；Zn?O； |