Probing the in-time piezoelectric responses and depolarization behaviors related to ferroelectric-relaxor transition in
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Probing the in-time piezoelectric responses and depolarization behaviors related to ferroelectricrelaxor transition in BiFeO3–BaTiO3 ceramics by in-situ process Yunchuan Tan1,2, Changrong Zhou1,2,* , Jiang Wang1,2,*, Kai Yao1,2, Changlai Yuan1,2, Jiwen Xu1,2, Qingning Li2, and Guanghui Rao1,2 1
Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, Guangxi, People’s Republic of China 2 School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, People’s Republic of China
Received: 12 October 2020
ABSTRACT
Accepted: 13 November 2020
Phase transition from a ferroelectric to relaxor phase at high temperature plays a crucial role on thermal depolarization process for piezoceramics. However, so far very few have been reported concerning the effect because the thermally induced depolarization was mainly based on ex-situ measuring. In this work, temperature-dependent dielectric, piezoelectric, and ferroelectric responses of BiFeO3–BaTiO3 (BF–BT) ceramics have been measured to evidence real-time depolarization behavior as well as their relationship with ferroelectric-relaxor transition. It is confirmed that in-situ temperature-dependent piezoelectric coefficient (d33) shows a considerable increase in ferroelectric phase. In particular, a sharp drop of d33 with the evidently depolarization process is directly related to the ferroelectric-relaxor transition at 200 °C. The development of the long-range ferroelectric order to the relaxor transition aiding the loss of preferred domain orientation is discussed as the origins for the depolarization behaviors, which is different from usual ex-situ measurements. In addition, d33 showed a second increase to a small extent due to the drastic improvement dielectric constant near Curie temperature Tc. The two increases and two decreases of in-time piezoelectric responses may provide a new insight to optimize the high-temperature piezoelectric performance by regulating phase transition temperature.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10854-020-04892-5
J Mater Sci: Mater Electron
1 Introduction Depending on the characteristic of high Curie temperature (* 830 °C) and stable electrical properties [1], bismuth ferrite (BiFeO3)-based perovskite piezoelectric materials are a powerful candidate in the application of aircraft engines, vibration control, dynamic control of automotive fuel injectors, pipeline flow detection, and control [2, 3]. Comparing with the widely concerned commercially high-performance lead-based piezoelectric ceramics like PZT [4–6], BiFeO3-based piezoelectric materials seem dim on account of the drawbacks of leakage current and poor piezoelectric performance [7, 8]. For exploiting application potentialities of BiFeO3-based piezoelectric materials deeply, the solid solution system of BiFeO3 with barium titanate (BaTiO3) wa
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