Kinetically stabilized metastable polarization states in ferroelectric ceramics

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• 作者：Zizhao Zhao ; Yudong Cao ; R. Edwin Garcí ; a ; ^{redwing@purdue.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lead-free ferroelectric ; Field-induced phase transition ; Metastable hysteric switching ; Morphotropic phase boundary model
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：573-581
• 全文大小：4248 K

文摘

By directly using experimental hysteresis loop data, a Landau theory-based model has been developed to investigate the effects of externally applied stimuli (electric field, stress, and temperature) on the average, time-dependent response in ferroelectric ceramics. For both PLZT and BNT-BT-KNN systems, experimentally observed (macroscopic) metastable states are a result of a free energy minimum that develops at a zero polarization state when the sample is subject to an externally applied field. Additionally, the frequency dependent hysteresis response demonstrates that a transition between relaxor ferroelectric and antiferroelectric develops at a critical cycling frequency, in agreement with the literature. The appearance of frequency-induced and electric field amplitude-induced kinetically stabilized phases is proposed and summarized in terms of frequency-stress and frequency-temperature response maps.