PSN,PSLN压电陶瓷结构与介电性能研究

The Study of Structure and Dielectric Property of PSN,PSLN Piezoelectric Ceramics

通过固相反应烧结法制备了ＰＳＮ、ＰＳＬＮ陶瓷，对样品进行ＸＲＤ分析，发现有超晶格衍射峰，说明Ｂ位离子部分有序。研究了不同频率下样品的介电常数随温度的变化情况，发现介电常数表现出明显的频率色散性，相变为弥散相变，但Ｔｍ随频率变化不大。ＰＳＬＮ四元系的Ｔｍ较三元系ＰＳＮ低。

PSN,PSLN ceramics were prepared through solid reaction sintering. The structure order characteristics of the ceramics were examined with XRD. Temperature dependence in various frequencies of dielectric constant of the PSN,PSLN ceramics were presented. It is demonstrated that the temperature of maximum dielectric constant Tm is almost indepentent of frequency, while the temperature dependence of the dielectric constant still exhibits frequency dispersion which is the characteristic of diffuse phase transition. Tm of PSLN is lower than that of PSN.