| 铁电体极化反转临界条件的细观力学分析 |
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| 引用本文： | 吴晶,李文芳.铁电体极化反转临界条件的细观力学分析[J].材料科学与工程学报,2009(4). |
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| 作者姓名： | 吴晶 李文芳 |
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| 作者单位： | 广东交通职业技术学院机电工程系;华南理工大学材料科学与工程学院材料科学与技术研究所; |
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| 基金项目： | 国家自然科学基金资助项目(10572050) |
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| 摘 要： | 本文根据经典形核理论,对铁电体极化反转过程的临界条件进行了热力学研究,建立了包括温度影响、外场作用、界面能以及退极化能等的热-力-电耦合细观力学模型,计算了铁电体BaTiO3极化反转的临界形核半径和临界形核功。结果表明在畴变过程中BaTiO3的临界形核半径和临界形核功都随反向电场的增加而减小,同样电场强度作用下临界形核半径和临界形核功随着温度的升高而减小。
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| 关 键 词： | 铁电体 极化反转 临界条件 细观力学 温度 |
Micromechanics Analysis of Critical Condition of Ferroelectric Polarization Reversal |
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| WU Jing,LI Wen-fang.Micromechanics Analysis of Critical Condition of Ferroelectric Polarization Reversal[J].Journal of Materials Science and Engineering,2009(4). |
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| Authors: | WU Jing LI Wen-fang |
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| Affiliation: | WU Jing~1,LI Wen-fang~2(1.Department of Mechanical & Electrical Engineering,Guangdong Communication Polytechnic,Guangzhou 510800,China,2.Institute of Material Science & Technoloby,College of Material Science & Engineering,South China University of Technology,Guangzhou 510650,China) |
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| Abstract: | Based on the classic nucleation theory,a thermal-mechanical-electric coupling micromechanics model was developed to calculate the critical condition of ferroelectric polarization reversal.Unlike the classical ferroelectric polarization reversal models,the model consisted of driving force item and resistance force item.And the model was capable of analyzing the influence of temperature,external load,interface energy and depolarization energy.A calculation according to BaTiO_3 was carried out and the results ... |
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| Keywords: | ferroelectrics polarization reversal critical condition micromechanics temperature |
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