Why do antiferroelectrics show higher fatigue resistance than ferroelectrics under bipolar electrical cycling?
Why do antiferroelectrics show higher fatigue resistance than ferroelectrics under bipolar electrical cycling?
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DOI：
10.1063/1.3082375
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发表时间：
2009-02-16
影响因子：
4
通讯作者：
Lou, X. J.
中科院分区：
文献类型：
--
作者：
Lou, X. J.
我们发现最近发展起来的铁电材料的疲劳模型可以解释为什么反铁电体在双极电循环下表现出比铁电材料更高的疲劳抗力。与铁电材料相比，反铁电材料具有更好的疲劳耐久性，这是由于它们具有较低的退极场、较低的局域注入功率密度和较低的相成核处的局域相分解几率。该模型可以解释单极脉冲在铁电材料中不会产生疲劳或几乎不会产生疲劳的事实，该模型预测在单极电子循环下，反铁电体的两个滞后分支中至少有一个会出现明显的疲劳。
We show that our fatigue model developed recently for ferroelectrics could explain why antiferroelectrics show higher fatigue resistance than ferroelectrics under bipolar electrical cycling. The better fatigue endurance of antiferroelectrics in comparison with their ferroelectric counterparts originates from their lower depolarization field, their lower local injected power density, and consequently their lower local phase decomposition probability at the phase nucleation sites. The model, which could explain the fact that unipolar pulses will produce no or little fatigue in ferroelectrics, predicts that evident fatigue will occur in at least one of the two hysteretic branches of antiferroelectrics under unipolar electrical cycling.