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Large tunability properties of (Ba0.91Ca0.09)(Zr0.2Ti0.8)O3-x mol% CuO ceramics under bias of domain switching effect

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Abstract

In this study, the dielectric and tunable properties of (Ba0.91Ca0.09)(Zr0.2Ti0.8)O3-x mol% CuO ceramics were investigated. The micromorphology and elements distribution of prepared ceramics were recorded to understand the dielectric and tunable properties. The grain size presents non-monotonic dependence on the content of CuO and the maximum grain size was found at x = 2. Meanwhile, the content of CuO has an important influence on the loss tangent of prepared ceramics. According to the measured complex impedance, (Ba0.91Ca0.09)(Zr0.2Ti0.8)O3-2 mol% CuO ceramic possessed a comparatively higher activation energy of grain boundary, making it have a lower loss tangent. The larger grains are in favor to the movement of domain due to the reductions in grain boundaries, which supports the enhancement of tunability. Thus, BCZTC2 ceramic possesses a maximum figure of merit (123.85) with a higher tunability (65%) at a lower electric filed (~ 7.5 kV/cm). Those results indicated that (Ba0.91Ca0.09)(Zr0.2Ti0.8)O3-2 mol% CuO ceramic can be applied into ferroelectric varactors with a low working electric filed.

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Funding

This work is supported by National Natural Science Foundation of China (Grant Nos. 52175525, 61971211), Science and Technology Project of Henan Province (Grant No. 222102230032) and Guangdong Basic and Applied Basic Research Foundation (2019A1515110880).

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Authors and Affiliations

  1. Department of Electrical Engineering and Automation, Luoyang Institute of Science and Technology, Luoyang, 471023, Henan, PR China

    Pan Yang, Bo Wang, Lijuan Zhang & Shihui Yu

  2. School of Microelectronics, Tianjin University, Tianjin, 300072, P. R. China

    Le Zhao

  3. International School of Microelectronics, Dongguan University of Technology, Dongguan, 523808, Guangdong, China

    Haoran Zheng

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  1. Pan Yang
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  2. Le Zhao
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  6. Shihui Yu
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Contributions

PY: investigation, formal analysis, data curation, writing—original draft, LZ: resources, investigation, data curation, visualization, HZ: data curation, resources, funding acquisition, BW: visualization, writing—review & editing, funding acquisition, LZ: data curation, visualization, writing—review & editing, supervision, SY: conceptualization, methodology, supervision, funding acquisition.

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Correspondence to Lijuan Zhang or Shihui Yu.

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Yang, P., Zhao, L., Zheng, H. et al. Large tunability properties of (Ba0.91Ca0.09)(Zr0.2Ti0.8)O3-x mol% CuO ceramics under bias of domain switching effect. J Mater Sci: Mater Electron 34, 811 (2023). https://doi.org/10.1007/s10854-023-10121-6

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