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层状钙钛矿铁电材料的畴结构研究

Domain Structures of Layered Bismuth Compounds

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【作者】 苏东姚阳阳丁勇陈恺朱劲松王业宁徐庆宇刘建设

【Author】 SU Dong, YAO Yang-yang, DING Yong, XU Qing-yu, CHEN Kai, LIU Jian-she, ZHU Jin-song, WANG Ye-ning(The Lab of Solid State Microstructures, Nanjing University, Nanjing 210093, China; Beijing Laboratory of Electron Microscopy, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;Institute of Microelectronics, Qinghua University, Beijing 100084, China)

【机构】 南京大学固体微结构物理国家重点实验室中科院物理所北京电子显微镜实验室清华大学微电子研究所 江苏南京210093江苏南京210093北京100080北京 100080

【摘要】 利用电子显微镜比较研究了SrBi2Ta2O9(SBT),Bi3TiTaO9(BTT),Bi4Ti3O12(BTO),Bi3.25La0.75Ti4O12(BLT),SrBi4Ti4O15-Bi4Ti3O12(SBTi-BT)和SrBi4Ti4O15-Bi3.25La0.75Ti3O12(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.

【Abstract】 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】 铁电存储器畴界疲劳
【Key words】 ferroelectric random access memorydomain wallfatigue
【基金】 国家自然科学基金资助(19904005;90207027)
  • 【文献出处】 哈尔滨理工大学学报 ,Journal of Harbin University of Science and Technology , 编辑部邮箱 ,2002年06期
  • 【分类号】TM221
  • 【下载频次】188
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