Li_(0.025)Na_(0.975)NbO_3晶体的介电和铁电性质  

Dielectric and Ferroelectric Properties of Li_(0.025)Na_(0.975)NbO_3 Crystal

作　　者：张沛霖[1] 赵明磊[1] 王春雷[1] 钟维烈[1] 陈焕矗[2] 宋永远[2] 

机构地区：[1]山东大学物理与微电子学院,济南250100 [2]山东大学晶体材料国家重点实验室,济南250100

出　　处：《压电与声光》2003年第3期227-228,共2页Piezoelectrics & Acoustooptics

基　　金：国家重点基础研究发展规划项目(G1998061408)

摘　　要：观察了Li0.025Na0.975NbO3晶体的电滞回线,并研究了它在400°C以下的介电温谱和室温时500MHz以下的介电频谱。其介电温谱的峰值在升温和降温时分别出现在380°C和365°C,有明显的热滞,因此其相变属于一级相变。Li0.025Na0.975NbO3晶体在500MHz附近可能存在介电弛豫。The ferroelectric and dielectric properties of Li0025Na0975NbO3 crystal were investigated The remanent polarization and coercive field of Li0025Na0975NbO3 crystal were 25 μC/cm2 and 17 kV/cm, respectively, at 160 °C The dielectric peak of Li0025Na0975NbO3 crystal was found to be 380 °C on heating and 365 °C on cooling, which indicates of a thermal hysteresis of about 15 °C In addition, the relax frequency of Li0025Na0975NbO3 crystal was measured to be about 500 MHz in this experiment

关 键 词：铁电相变 电滞回线 介电弛豫 Li0.025Na0.975NbO3晶体 介电频谱 

分 类 号：TM22[一般工业技术—材料科学与工程]