层状钙钛矿铁电材料的畴结构研究  

Domain Structures of Layered Bismuth Compounds

作　　者：苏东[1] 姚阳阳[1] 丁勇[1] 陈恺[1] 朱劲松[1] 王业宁[1] 徐庆宇[2] 刘建设[3] 

机构地区：[1]南京大学固体微结构物理国家重点实验室,江苏南京210093 [2]中科院物理所北京电子显微镜实验室,北京100080 [3]清华大学微电子研究所,北京100080

出　　处：《哈尔滨理工大学学报》2002年第6期27-28,31,共3页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金资助(19904005;90207027)

摘　　要：利用电子显微镜比较研究了SrBi_2Ta_2O_9(SBT),Bi_3TiTaO_9(BTT),Bi_4Ti_3O_12(BTO),Bi_3.25La_0.75Ti_4O_12(BLT),SrBi_4Ti_4O_15-Bi_4Ti_3O_12(SBTi-BT)和SrBi_4Ti_4O_15-Bi_3.25La_0.75Ti_3O_12(SBTi-BLT)各自的畴结构和形态,并讨论了可能的相关机制.研究结果发现:90°畴的形态和密度各不相同,均受材料本征的内应力影响;90°畴界密度较高的材料对应的疲劳性也较好.The domain structures of SBT and BTT, BTO and BLT, SBTi-BT and SBTi-BLT were studied by transmission electron microscope. 90°domain walls and anti - phase boundaries are found. High density and curved 90°domain walls are observed in SBT, BLT and SBTi - BLT which had fatigue free properties. On the other hand, faceted and low density 90°domain walls are found in fatigue failure materials : BTT, BTO and SBTi - BT. The possible mechanism is discussed.

关 键 词：铁电材料 畴结构 铁电存储器 畴界 疲劳 层状钙钛矿结构 

分 类 号：TM221[一般工业技术—材料科学与工程]