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Silver stoichiometry engineering: an alternative way to improve energy storage density of AgNbO3-based antiferroelectric ceramics

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  • Focus Issue: Lead-Free Ferroelectric Materials
  • Published:
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Abstract

Lead-free dielectric capacitor with high energy storage density is in great demand, but with the challenge of limited energy storage density. In this work, Ag(Nb0.85Ta0.15)O3-x wt% Ag2O (ANTAx) lead-free ceramics with nonstoichiometric Ag2O were fabricated, with the aim of improving energy storage density. The element concentration, phase structure, microstructure, dielectric property, and energy storage performance were investigated. Improved recoverable energy storage density (Wrec) of 4.8 J/cm3 were achieved for ANTA1 ceramics with 1 wt% Ag2O in excess, demonstrating obvious improvement compared with the stoichiometric counterpart. In addition, the ANTA1 ceramics also exhibited highly stable energy storage performance in the temperature range from room temperature to 150 °C, with variations less than 4% and 5% for Wrec and energy storage efficiency, respectively. The good properties may be associated with the dismissing of various defects by adding excess Ag2O. This work demonstrates that silver stoichiometry engineering is an effective method to improve energy storage properties of AgNbO3-based antiferroelectric ceramics.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grant No. 52072080, 11864004), the Natural Science Foundation of Guangxi province (Grant No. 2017GXNSFBA198132), and the Science and Technology Major Project of Guangxi province (Grant No. AA17204100).The author also thanks the fund (Grant No. 20KF-16) from the Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education/ Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin (541004), China.

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Authors and Affiliations

  1. Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China

    Nengneng Luo, Xinya Tang, Kai Han, Li Ma, Zhenpei Chen, Xiyong Chen, Qin Feng, Yuezhou Wei & Fujita Toyohisa

  2. Center On Nanoenergy Research, School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China

    Nengneng Luo & Li Ma

  3. Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education/Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin, 541004, China

    Changzheng Hu

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  1. Nengneng Luo
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Correspondence to Nengneng Luo or Fujita Toyohisa.

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Luo, N., Tang, X., Han, K. et al. Silver stoichiometry engineering: an alternative way to improve energy storage density of AgNbO3-based antiferroelectric ceramics. Journal of Materials Research 36, 1067–1075 (2021). https://doi.org/10.1557/s43578-020-00018-z

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  • DOI: https://doi.org/10.1557/s43578-020-00018-z

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