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首页> 外文期刊>Journal of the European Ceramic Society >In-situ TEM study of the aging micromechanisms in a BaTiO3-based lead-free piezoelectric ceramic
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In-situ TEM study of the aging micromechanisms in a BaTiO3-based lead-free piezoelectric ceramic

机译:基于BATIO3的无铅压电陶瓷老化微机械的原位TEM研究

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摘要

Aging and fatigue are the two main concerns regarding the performance reliability of piezoelectric ceramics. Compared with fatigue, less efforts have been made towards clarifying the micromechanisms of aging. In this report, we employ electric field in-situ transmission electron microscopy (TEM) to directly visualize the domain structure evolution during fatigue and the subsequent aging process in the 0.5Ba(Zr0.2Ti0.8) O-3-0.5(Ba0.7Ca0.3)TiO3 (BZT-BCT) polycrystalline ceramic. The macroscopic aging behaviors, including the development of internal bias field (E-bias) and the degradation in switchable polarization (2P(r)), are correlated with the microscopic domain wall clamping and domain disruption resulted from the redistribution of oxygen vacancies driven by depolarization field.
机译:老化和疲劳是压电陶瓷性能可靠性的两个主要问题。 与疲劳相比,已经对阐明了衰老的微机制来说,较少的努力。 在本报告中,我们采用电场原位透射电子显微镜(TEM),直接在0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0中的随后的衰老过程中的域结构演化和随后的老化过程。 7CA0.3)TiO3(BZT-BCT)多晶陶瓷。 包括内部偏置场(E-BIAS)的发展和可切换偏振中的降解(2p(r))的宏观老化行为与显微域壁夹持和域破坏引起的氧空位驱动的再分布 去极化领域。

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