Kinetically stabilized metastable polarization states in ferroelectric ceramics

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 syste...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2017-02, Vol.37 (2), p.573-581
Main Authors: Zhao, Zizhao, Cao, Yudong, García, R. Edwin
Format: Article
Language:English
Subjects:
Field-induced phase transition
Lead-free ferroelectric
Metastable hysteric switching
Morphotropic phase boundary model
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Summary: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.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2016.08.022