| 铁电相变的简谐子软模图像 |
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| 引用本文： | 丘翠环,李智强,何山,陈敏.铁电相变的简谐子软模图像[J].中山大学学报(自然科学版),2002,41(2):25-28. |
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| 作者姓名： | 丘翠环 李智强 何山 陈敏 |
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| 作者单位： | 1. 广东药学院物理教研室,广东,广州,510224
2. 中山大学物理系,广东,广州,510275 |
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| 基金项目： | 广东省“十五”重大科技专项资助项目 (C1110 2 ) |
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| 摘 要： | 在自由边界条件下计算了立方钛酸钡有限尺寸晶体中原子的简谐振动模 ,发现许多简谐子软模。用这些软模花样说明了晶体冷却时发生具有a畴和c畴结构的铁电相变。理论表明铁电相变过程涉及屏蔽电荷的激发及其在界面的缓慢扩散 ,以最后得出各个电畴内部的均匀自发极化。铁电相变过程的这些细节 ,都得到了实验的有力证明
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| 关 键 词： | 铁电相变 软模 简谐子 |
| 文章编号： | 0529-6579(2002)02-0025-04 |
| 修稿时间： | 2001年9月7日 |
Harmonon Soft Modes in Ferroelectric Phase Transition |
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| QIU Cui-huan ,LI Zhi-qiang ,HE Shan ,CHEN Min.Harmonon Soft Modes in Ferroelectric Phase Transition[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2002,41(2):25-28. |
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| Authors: | QIU Cui-huan LI Zhi-qiang HE Shan CHEN Min |
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| Institution: | QIU Cui-huan 1,LI Zhi-qiang 2,HE Shan 2,CHEN Min 2 |
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| Abstract: | The soft modes in finite-size cubic BaTiO3 crystal with free boundary were calculated,and they can be used to explain the phenomenon that crystal has the structure of a and c domains in ferroelectric phase transition while temperature reduction. The theory indicated that the process of ferroelectric phase transition was involved in the excitation of screen charges and slow diffusion on their interface till homogeneous spontaneous polarization in each electric domain. All above details were strongly proved by the experiments. |
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| Keywords: | ferroelectric phase transition soft mode harmonon |
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