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退极化场对Ba0.5 Sr0.5 TiO3外延薄膜的铁电和介电性能的影响

张宪贵 那木拉 宋建民 杨帆

张宪贵, 那木拉, 宋建民, 杨帆. 退极化场对Ba0.5 Sr0.5 TiO3外延薄膜的铁电和介电性能的影响[J]. 华南师范大学学报(自然科学版), 2022, 54(2): 7-12. doi: 10.6054/j.jscnun.2022019
引用本文: 张宪贵, 那木拉, 宋建民, 杨帆. 退极化场对Ba0.5 Sr0.5 TiO3外延薄膜的铁电和介电性能的影响[J]. 华南师范大学学报(自然科学版), 2022, 54(2): 7-12. doi: 10.6054/j.jscnun.2022019
ZHANG Xiangui, NA Mula, SONG Jianmin, YANG Fan. The Effect of Depolarization Field on Ferroelectric and Dielectric Properties of Ba0.5Sr0.5TiO3 Epitaxial Thin Films[J]. Journal of South China normal University (Natural Science Edition), 2022, 54(2): 7-12. doi: 10.6054/j.jscnun.2022019
Citation: ZHANG Xiangui, NA Mula, SONG Jianmin, YANG Fan. The Effect of Depolarization Field on Ferroelectric and Dielectric Properties of Ba0.5Sr0.5TiO3 Epitaxial Thin Films[J]. Journal of South China normal University (Natural Science Edition), 2022, 54(2): 7-12. doi: 10.6054/j.jscnun.2022019

退极化场对Ba0.5 Sr0.5 TiO3外延薄膜的铁电和介电性能的影响

doi: 10.6054/j.jscnun.2022019
基金项目: 

河北省教育厅青年基金项目 QN2018001

河北省创新创业专项 S202110086039

河北省高等学校科技专项 ZD2020181

详细信息
    通讯作者:

    张宪贵,Email: lxzhxg@hebau.edu.cn

  • 中图分类号: O469

The Effect of Depolarization Field on Ferroelectric and Dielectric Properties of Ba0.5Sr0.5TiO3 Epitaxial Thin Films

  • 摘要: 基于Ginzburg-Landau-Devonshire唯象理论,定性研究了在有或无退极化场情形下外延Ba0.5Sr0.5TiO3薄膜的铁电和介电性能随厚度的依赖特性。结果表明:与无退极化场相比,退极化场的存在使薄膜极化强度空间分布更均匀,抑制了系统的平均极化强度,降低了相变温度(ΔTc),但增加了临界厚度(Δhc、Δhm)和调谐率(Δφ),尤其在电极弱补偿情况下更加显著,厚度为100 nm时薄膜的ΔTc、Δhc、Δhm和Δφ分别约为-57.5 ℃、15 nm、40 nm和20%;外延薄膜的介电性能取决于极化强度对外加电场的响应能力,而非极化本身,这一观点可从完全相反的极化强度和调谐率厚度依赖性趋势充分证明。
  • 图  1  平均极化强度随厚度的变化

    Figure  1.  The change of mean polarization with thickness

    图  2  100 nm厚度薄膜的极化强度分布

    Figure  2.  The spatial distribution of 100-nm-thickness film polarization

    图  3  不同退极化场条件下薄膜的相变特性

    Figure  3.  The phase transition characteristics of thin films under different depolarization fields

    图  4  调谐率、零场介电常数随厚度的变化

    Figure  4.  The change of tunability and zero electric field dielectric constant with thickness

    表  1  BST 50/50薄膜计算参数

    Table  1.   The calculation parameters for BST 50/50 film

    参数 结果
    T/K 298
    Tc/K 235
    a1/(C-2·m2·N) 9.1(T-Tc)×105
    a11/(C-4·m6·N) 4[796+2.16(T-273)]×106
    (S11+S12)/(m2·N-1) 3.29×10-12
    Q12/(m4·C-2) -2.75×10-2
    D/(V·m5·C-3) 0.9×10-9
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出版历程
  • 收稿日期:  2021-11-18
  • 网络出版日期:  2022-05-12
  • 刊出日期:  2022-04-25

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