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Greatly reduced leakage current and defect mechanism in atmosphere sintered BiFeO3–BaTiO3 high temperature piezoceramics

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Abstract

In current work, the effect of sintering atmospheres (N2, air and O2) on the structure, electrical properties, and defect mechanism of 0.8BiFeO3–0.2BaTiO3 lead-free piezoelectric ceramics has been investigated. X-ray diffractometer results indicated all the samples crystallized into the rhombohedrally distorted perovskite structure which was independent on the sintering atmospheres. Bi-containing impurity phases were observed in N2 sintered samples while not appearing in other atmospheres. X-ray photoelectron spectrum analysis indicated more Fe2+ ions, which can result in high leakage current, were involved in N2 sintered ceramics than that in O2- and air sintered compositions. However, greatly reduced leakage currents were obtained in N2 sintered ceramics which should be ascribed to the formation of secondary phases. The largest polarization and lowest leakage current were obtained in the sample sintered in N2 (2 h), which owned the optimal ferroelectric, piezoelectric, and electromechanical properties with piezoelectric constant d 33 = 98 pC/N, planar electromechanical coupling factors k p = 26.1 %, remnant polarization P r = 25.7 µC/cm2, coercive field E c = 74.6 kV/cm, and a high Curie temperature T c = 632 °C, respectively.

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Acknowledgments

The authors would like to thank the support of the International Technology Cooperation Project from the Ministry of Science and Technology of China (2011DFA52680), Natural Science Foundation of China (No. 51372191 and No. 51102189), the Fundamental Research Funds for the Central Universities (No. 2012-IV-006), and State Key Laboratory of New Ceramic and Fine Processing Tsinghua University (KF201314).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Zhonghua Yao, Chaobing Xu, Hanxing Liu, Hua Hao, Minghe Cao, Zhijian Wang, Zhe Song, Wei Hu & Atta Ullah

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  1. Zhonghua Yao
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  2. Chaobing Xu
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  3. Hanxing Liu
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  4. Hua Hao
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Correspondence to Zhonghua Yao.

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Yao, Z., Xu, C., Liu, H. et al. Greatly reduced leakage current and defect mechanism in atmosphere sintered BiFeO3–BaTiO3 high temperature piezoceramics. J Mater Sci: Mater Electron 25, 4975–4982 (2014). https://doi.org/10.1007/s10854-014-2260-0

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