掺锰锆钛酸铅镧陶瓷的弛豫特性研究  

Relaxation properties of Mn-doped PLZT ceramics

作　　者：何聚[1,2] 黄志永[1] 鲍婕[1] 郑立[1] 

机构地区：[1]黄山学院信息工程学院,安徽黄山245041 [2]南京大学物理学院,江苏南京210093

出　　处：《合肥工业大学学报（自然科学版）》2014年第5期538-542,共5页Journal of Hefei University of Technology：Natural Science

基　　金：安徽省教育厅自然科学基金资助项目(KJ2008B113ZC;KJ2013B267);黄山学院示范实验实训中心资助项目(2010SYJX01)

摘　　要：文章通过水热法制备了Mn掺杂的Pb0.96La0.04(Zr0.55Ti0.45)0.99O3陶瓷。X射线衍射分析发现Mn掺杂可以使PLZT由菱方相向四方相转变;扫描电子显微镜观察到陶瓷是晶粒均匀的致密结构,Mn掺杂会使晶粒变小;介电性能测试发现Mn的掺入会增强陶瓷的弛豫特性;Vogel-Fulcher关系式拟合结果显示Mn掺杂的PLZT具有类似自旋玻璃的极化行为;铁电分析表明Mn掺杂量的增加会使铁电畴的背向反转率和矫顽场分别增大和减少,同时伴有频率色散现象,可能与黏滞力的减小有关。Mn-doped Pb0.96 La0.04（Zr0.55 Ti0.45） 0.99 O3 ceramics were prepared by hydrothermal method.It is shown that the structure of PLZT changes from the rhombohedra to the tetragona with increasing of Mn content by X-ray diffraction（XRD）.Uniform grain distribution with compact structure is observed by scanning electron microscope（SEM）and the grain size is found to decrease with Mn doping.A dielectric relaxation is observed in all the Mn-modified compositions and enhanced with Mn doping.The result of Vogel-Fulcher relation fitting indicates that the samples have the polarization behavior of spin glass.The ferroelectric analysis result shows that the backswitching and coercive field of the ferroelectric domain increase and decrease respectively with frequency dispersion as the Mn content increases,which is possibly due to the decrease of viscous force.

关 键 词：锆钛酸铅镧 水热合成 MN掺杂 介电弛豫 

分 类 号：O469[理学—凝聚态物理]