摘要
研究了Pb[(Zr0 52 Ti0 4 8) 0 95(Mn1 3Nb2 3) 0 0 5]O3(PMnN_PZT)铁电陶瓷电滞回线的温度和频率响应 ,结果显示在高频和室温条件下测试铁电特性时 ,电滞回线呈现“束腰”形状 ,而不是通常所看到的方形回线 .在低频和高温条件下测试时才能观察到正常的方形回线 ,同时 ,诸如矫顽场、极化强度、内偏场这些重要的铁电参数也会随频率和温度发生显著的变化 .剩余极化强度随频率和温度的大幅增长表明“束腰”电滞回线有可能是由于缺陷偶极子引起的 .电滞回线形状与温度和频率存在较强的相关性说明缺陷偶极子存在一特征弛豫时间 ,缺陷偶极子反转响应速度由此弛豫时间决定 .
The frequency and temperature dependence of the hysteresis loops in Ph[( Zr0.52Ti0.48)(0.95) ( Mn-1/3 Nb-2/3)(0.05)]O-3( PMnN-PZT) ceramics have been investigated. It has been demonstrated that the polarization-field hysteresis curves show 'pinched' shapes instead of the normal square-like P-E loops when tested at room temperature or higher frequency. While at 200 degreesC or lower frequency, normal square-like loops are observed. In the meantime, important ferroelectric features such as coercive field, polarization and internal bias field are strongly frequency or temperature dependent. High increase of the remnant polarization (P-r) reveals that there may be defect dipoles that induce the unsaturated hysteresis loop. The close relations between the P-E loops and the applied frequencies or temperatures indicate that there exists a typical relaxation time associated with reorientation of the defect dipoles.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第2期939-943,共5页
Acta Physica Sinica
基金
国家高技术研究发展计划 (批准号 :2 0 0 1AA3 2 5 0 3 0 )
国家基础研究发展规划项目 (批准号 :2 0 0 2CB13 3 0 7)资助的课题~~
