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ID：21128106
大小：5.62 MB
页数：50页
时间：2018-10-19
《毕业论文 付茂祥》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、..本科毕业论文(设计)题目：取向生长Bi4Ti3O12铁电薄膜的回线动力学标度学院：物理科学学院专业：材料物理姓名：付茂祥指导教师：卢朝靖张永成....2012年6月12日....摘要稀土掺杂层状钙钛矿结构的Bi4Ti3O12铁电薄膜具有居里温度高，自发极化大，耐疲劳性好的特点，适用于制作铁电储存器。由于Bi4Ti3O12铁电薄膜的自发极化矢量靠近a轴，近a轴生长的Bi4Ti3O12铁电薄膜具有大的剩余极化强度。对比研究了随机取向Bi4Ti3O12铁电薄膜和a/b轴择优取向Bi4Ti3O12铁电薄膜的回线动力学标度。结果表明a/b轴高
2、择优取向度的Bi4Ti3O12铁电薄膜的标度关系为：低频段0.0430.8-0.210.8∝fE0；高频段∝fE0。a/b轴低择优取向度的Bi4Ti3O12铁电薄膜的标度-0.050.917关系为：∝fE0。随机取向Bi4Ti3O12铁电薄膜的标度关系在高频和低频统一为-0.071.31∝fE0。AbstractTherare-earthdopedFerroelectricBi4Ti3O12oflayered-perovskitewhichhashighCurietemperature,largespontane
3、ouspolarizationandgood....fatigueresistance,isoneofthecandidatematerialsfornonvolatileferroelectricmemoryapplication.DuetothespontaneouspolarizationoftheBi4Ti3O12thinfilmsisclosetothea-axis,thea-axis(orneara-axis)growthBi4Ti3O12thinfilmshasalargeremanentpolarization.Thes
4、calingbehaviorofthedynamichysteresisona/b-axesorientedandrandomlyorientedBi4Ti3O12thinfilmswasinvestigated.Thescalingrelationsofa/b-axesorientedBi4Ti3O12ofhighpreferentialorientationdegreethin0.0430.8filmswere∝fE0whenf<1/eand0.210.8∝fE0whenf>1/e.Thescalingrelati
5、onsofa/b-axesorientedBi4Ti3O12oflowpreferentialorientationdegree0.050.917thinfilmswere∝fE0.WhilethescalingrelationsofrandomlyorientedBi4Ti3O12thinfilms∝f0.071.31E0.....目录第一章铁电材料综述...................................11.1铁电材料的定义..................................11.2铁电
6、薄膜..............................................31.3取向生长Bi4Ti3O12铁电薄膜...............5第二章动力学标度及其意义.......................72.1电滞回线的产生..................................72.2回线动力学标度..................................82.3进行回线动力学标度的意义..............82.4铁电材料动力学标度的研究现状....10第三章实验方法
7、.........................................143.1实验方案............................................143.2测量电滞回线的原理和方法............143.3数据处理方法....................................17第四章Bi4Ti3O12薄膜的回线动力学标度..204.1随机取向Bi4Ti3O12铁电薄膜（1#）的回线动力学标度.......................................20
8、4.2a/b轴择优取向Bi4Ti3O12薄膜（2#）的回线动力学标度...................................244.3a/b轴择优取向Bi4Ti3O12薄膜（3#）的回线动力学
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