Model of ferroelectric fatigue due to defect/domain interactions
Model of ferroelectric fatigue due to defect/domain interactions
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DOI：
10.1080/00150199308008705
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发表时间：
1993-12
期刊：
影响因子：
0.8
通讯作者：
C. Brennan
中科院分区：
文献类型：
--
作者：
C. Brennan
从朗道理论出发，建立了一个简单的铁电疲劳模型。该模型提出，一般的疲劳机制是由于相互作用的带电晶格缺陷和相反的域的介观结构的形成。结果表明，离子缺陷可通过极化周围的铁电晶格而产生自陷势。这些离子缺陷在铁电切换期间在相邻晶格位点上产生额外的电应力和机械应力，从而促进相邻缺陷的形成。建议的结果是，缺陷平面形成铁电开关，取向垂直于极化轴。每个缺陷平面将两个相对的畴分开：作为一个系统，缺陷平面和相对的畴形成能量自稳定结构。相反的畴导致出现弱铁电性，顺电性，或线性增加的电荷积累的宏观电响应的退化…
A simple model for ferroelectric fatigue is developed from Landau theory. This model proposes that the general fatigue mechanism is due to the formation of mesoscopic structures of interacting charged lattice defects and opposing domains. It shows that the ionic defects may induce a self-trapping potential by polarizing the surrounding ferroelectric lattice. These ionic defects produce additional electrical and mechanical stress on adjacent lattice sites during ferroelectric switching and thereby encourage the formation of neighboring defects. The proposed consequence is that defect planes form during ferroelectric switching that are oriented perpendicular to the polarization axis. Each defect plane separates two opposing domains: as a system, the defect plane and the opposing domains form an energetically self-stabilizing structure. The opposing domains result in a degraded macroscopic electrical response that appears weakly ferroelectric, paraelectric, or linear with increasing charge accumulation at th...