Two-step polarization reversal in biased ferroelectrics
Two-step polarization reversal in biased ferroelectrics
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DOI：
10.1063/1.4881835
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发表时间：
2014-06-14
影响因子：
3.2
通讯作者：
Jones, Jacob L.
中科院分区：
文献类型：
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作者：
Daniels, John E.;Cozzan, Clayton;Jones, Jacob L.
多晶铁电体中的极化反转是通过两个不同的和顺序的畴重取向步骤发生的。这种重新取向的序列，这不能很容易地区分在整个样品的偏振，是显而易见的使用时间分辨高能X射线衍射。当施加与初始极化方向相反的电场时，观察到两个独特且显著不同的时间常数。第一个（更快的时间常数）被证明是由释放的残余应力，由于初始的电偏置和第二（较慢的时间常数），由于在进一步的畴壁运动的残余应力的重建。给出了一个修正的畴重取向模型，该模型准确地描述了反转过程中畴体积分数的变化。(C)2014 AIP出版有限责任公司。
Polarization reversal in polycrystalline ferroelectrics is shown to occur via two distinct and sequential domain reorientation steps. This reorientation sequence, which cannot be readily discriminated in the overall sample polarization, is made apparent using time-resolved high-energy x-ray diffraction. Upon application of electric fields opposite to the initial poling direction, two unique and significantly different time constants are observed. The first (faster time constant) is shown to be derived by the release of a residual stress due to initial electrical biasing and the second (slower time constant) due to the redevelopment of residual stress during further domain wall motion. A modified domain reorientation model is given that accurately describes the domain volume fraction evolution during the reversal process. (C) 2014 AIP Publishing LLC.