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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
【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.
【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