Investigation of Switching Behavior of Acceptor-Doped Ferroelectric Ceramics

Chenxi Wang, Xiaoming Yang, Zujian Wang, Chao He, X. Long
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引用次数: 25

Abstract

Abstract Switching behavior is a general feature in ferroelectrics. The related fatigue effects influenced by defect dipoles in ferroelectrics are still controversial that is focused on the positive and negative effects of oxygen vacancies. Here, we report the polarization switching behavior of acceptor-doped ceramics using the first-order reversal curve (FORC) approach, especially for the abnormal self-rejuvenation effect and the enhanced fatigue endurance in acceptor-doped ceramics. The reversible and irreversible components under electric field in the ceramics were distinguished by the FORC distribution of ideal “hysteron”. The abnormal self-rejuvenation behavior stemmed from dispersive response of hysteron for undoped samples while from the redistribution of defect dipoles for acceptor-doped samples. The self-rejuvenation was induced mainly by the irreversible component. For the fatigue effect, the pinning of domain walls was not the main reason. The re-annealing treatment for a fatigued sample weakened the interactions between the spontaneous polarizations and defect dipoles, but enhanced the dispersion of coercive field. The enhancement of fatigue endurance came from the phase stability of structure in acceptor-doped ceramics, while complex phase evolution existed in undoped ceramic with weak fatigue endurance. Our study shed new light on the interactions between spontaneous polarization and defect dipoles under repetitive AC electric field.
受体掺杂铁电陶瓷的开关行为研究
开关行为是铁电体的一个普遍特征。铁电体中缺陷偶极子对疲劳效应的影响仍然存在争议,主要集中在氧空位的正负影响上。本文采用一阶反转曲线(FORC)方法研究了受体掺杂陶瓷的极化开关行为,特别是受体掺杂陶瓷的异常自愈和增强的疲劳耐力。利用理想“磁滞子”的FORC分布,区分了陶瓷在电场作用下的可逆和不可逆组分。异常的自愈行为源于未掺杂样品的滞子色散响应,而受体掺杂样品的缺陷偶极子重分布。不可逆成分主要诱导其自我年轻化。对于疲劳效应,区域壁的钉住不是主要原因。疲劳样品的再退火处理减弱了自发极化与缺陷偶极子之间的相互作用,但增强了矫顽力场的色散。受体掺杂陶瓷的疲劳耐久性增强主要来自于结构的相稳定性,而未掺杂陶瓷则存在复杂的相演化,疲劳耐久性较弱。本研究对重复交流电场作用下的自发极化与缺陷偶极子之间的相互作用有了新的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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