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A comparative study of microstructure and electrical properties of lead-free (1 − x)(Ba0.85Ca0.15) (Zr0.09Ti0.91)O3–xTa + Li2CO3 ceramics compounded by microwave and conventional sintering techniques

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Abstract

To upgrade piezoelectric properties of lead-free ceramics, (Ba0.85Ca0.15) (Zr0.09Ti0.91)O3 + 0.6 wt% Li2CO3 ceramics by doping tantalum oxide (Ta2O5) were successfully fabricated by microwave sintering (MWS) and conventional solid phase sintering (CS), respectively. The results show that piezoelectric performance of the ceramics by MWS (d33 ~ 317 pC/N, Pr ~ 12.39 µC/cm2 and Tc~ 101 °C, respectively) is significantly enhanced compared with the ceramics by CS (d33 ~ 203 pC/N, Pr ~ 9.33 µC/cm2 and Tc~ 94 °C, respectively), and the optimum properties by doping the Ta2O5 are obtained at x = 0.04 wt%, which is attributed to that rhombohedral–tetragonal (R–T) phase coexists in samples by MWS. The temperature-dependent dielectric performance of the ceramics manifests evident relaxor phenomena under 1 MHz by MWS, which proved that the samples were relaxor ferroelectrics with a large dielectric constant (5512, x = 0.04 wt%).

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (NSFC Nos. 51602066, 51862003) and High-Level Innovative Talents Plan of Guizhou Province [No. (2015) 4009].

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Authors and Affiliations

  1. College of Materials and Metallurgy, Guizhou University, Guiyang, 550025, Guizhou, China

    An Xue, Yuanyu Wang, Qibin Liu, Shiqiang Peng & Fanghui Mou

  2. Key Laboratory for Material Structure and Strength of Guizhou Province, Guiyang, 550025, Guizhou, China

    Qibin Liu

  3. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China

    Fangfang Zeng

  4. Guizhou Zhenhua Electronic Information Industry Technology Research Co., Ltd, Guiyang, 550025, Guizhou, China

    Xuejie Wang

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  1. An Xue
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Xue, A., Zeng, F., Wang, Y. et al. A comparative study of microstructure and electrical properties of lead-free (1 − x)(Ba0.85Ca0.15) (Zr0.09Ti0.91)O3–xTa + Li2CO3 ceramics compounded by microwave and conventional sintering techniques. J Mater Sci: Mater Electron 31, 8291–8296 (2020). https://doi.org/10.1007/s10854-020-03364-0

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