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Formation mechanism, dielectric properties, and energy-storage density in LiNbO3-doped Na0.47Bi0.47Ba0.06TiO3 ceramics

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Abstract

The development of ferroelectric (FE) ceramics with high recoverable energy-storage density (Wrec) critically affects the miniaturization and integration of advanced pulse-power capacitors. However, most lead-free FE materials have the shortcomings of large remanent polarization and low dielectric breakdown strength. In this work, a strategy of composition control was implemented to improve the Wrec of lead-free ceramics. The effects of Li and Nb ion incorporation on the structure, dielectric, and ferroelectric properties of the highly insulating (Na0.5Bi0.5)TiO3–BaTiO3 (NBT–BT) ceramic was investigated. X-ray diffraction analysis of the samples revealed that the pure phase was isostructural to (Na0.5Bi0.5)TiO3. Dielectric measurements exhibited two pronounced anomalies which shift a certain angle within the depolarization-temperature range. The effects of LiNbO3 content on the breakdown characteristics and discharge energy storage of NBT–BT ceramics were investigated. An enhanced discharged energy density of 1.05 J/cm3, calculated from a hysteresis loop, was observed at x = 4 mol%. The improved structure also resulted in an increase of up to 61% in breakdown strength.

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Acknowledgements

Financial supports of Guangxi natural science foundation (Grants No. 2019GXNSFAA245032) and the Scientific Research Fund of Guangxi Education Department (Grants No. 2017KY0208) are acknowledged by the authors.

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Authors and Affiliations

  1. School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China

    Qin Feng, Kai Huang, Nengneng Luo, Yuezhou Wei & Toyohisa Fujita

  2. Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning, 530004, China

    Qin Feng, Kai Huang, Nengneng Luo, Yuezhou Wei & Toyohisa Fujita

  3. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, People’s Republic of China

    Qin Feng, Changlai Yuan, Changrong Zhou, Qingning Li & Guohua Chen

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  1. Qin Feng
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  2. Kai Huang
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Correspondence to Changlai Yuan or Toyohisa Fujita.

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Feng, Q., Huang, K., Luo, N. et al. Formation mechanism, dielectric properties, and energy-storage density in LiNbO3-doped Na0.47Bi0.47Ba0.06TiO3 ceramics. J Mater Sci: Mater Electron 31, 13368–13375 (2020). https://doi.org/10.1007/s10854-020-03891-w

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