Role of internal field and exhaustion in ferroelectric switching
Role of internal field and exhaustion in ferroelectric switching
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DOI：
10.1063/1.4856235
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发表时间：
2014-01
影响因子：
3.2
通讯作者：
G. Viola;K. Chong;F. Guiu;M. Reece
中科院分区：
文献类型：
--
作者：
G. Viola;K. Chong;F. Guiu;M. Reece
通过研究在铁电陶瓷（PZT 5A）的极化-电场（P-E）环的不同点处施加静电场期间极化切换的动力学，研究了内部场和耗尽在铁电切换期间的作用。通过同时测量蠕变过程中极化和应变的变化，获得了极化切换过程中内部场的演变。进行电场部分卸载测试以估计P-E环的不同点处的有效内部场的大小。结果表明，内场随极化反转成正比增加。一个速率模型，包括开关过程中的热波动，内部场和耗尽的成核位置的影响已经开发和应用，以适应极化蠕变曲线。蠕变曲线在亚矫顽区的拟合表明，极化硬化（内禀电阻的增加）是影响合金蠕变性能的主要因素。
The role of internal field and exhaustion during ferroelectric switching was investigated by studying the dynamics of polarisation switching during the application of static electric fields at different points of the polarization-electric field (P-E) loop of a ferroelectric ceramic (PZT 5A). By simultaneously measuring polarization and strain changes during creep an insight into the evolution of the internal field during polarization switching was obtained. Electric field partial unloading tests were performed to estimate the magnitude of the effective internal field at different points of the P-E loop. Results show that the internal field increases proportionally with polarization reversal. A rate model that includes the effect of thermal fluctuations, internal field and exhaustion of nucleation sites during switching has been developed and applied to fit the polarization creep curves. The fitting of the creep curves in the sub-coercive region suggests that polarization hardening (increasing of internal ...