弛豫铁电体的弛豫性结构研究  

Structure and relaxation of relaxor ferroelectrics

作　　者：张栋杰[1] 

机构地区：[1]南京师范大学材料科学重点实验室,江苏南京210097

出　　处：《功能材料》2005年第7期1017-1020,1023,共5页Journal of Functional Materials

基　　金：江苏高校自然科学研究计划资助项目(03KJB430068)

摘　　要：利用特殊的陶瓷烧结方法制备了铅基弛豫铁电体0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3和Pb(Zn1/3Nb2/3)O3基陶瓷。铅基弛豫铁电体PMNT、PZN的弛豫过程可用修正的玻璃局域冻结模型描述。在微畴-宏畴转变过程中,铁电体的结构起伏引起弛豫性;弛豫铁电体结构起伏程度越大,弛豫性越低;随微畴增大,铁电体的弛豫特性减弱直至消失。The Pb-based complex relaxor ferroelectrics (RFE) of PMN and PZN ceramics were prepared. The microdomain-macrodomain transition of relaxor ferroelectrics was studied by using amending local freezing glass-model. The frequency dispersion of the temperature of the dielectric permittivity maximum had been caused by the structural fluctuation of RFE during the microdomain-macrodomain transition. The more the structural fluctuation of RFE was, the lower the relaxation degree was in the process of microdomain-macrodomain transition. The relaxation degree was diminished or vanished when the microdomain became larger.

关 键 词：弛豫铁电体 结构 陶瓷 玻璃 

分 类 号：O482.54[一般工业技术—材料科学与工程]