Abstract
Sr0.7Bi0.2TiO3-based ceramics with excellent dielectric temperature stability and energy storage efficiency (η) are expected to be applied in dielectric ceramic capacitors. Unfortunately, low breakdown strength (BDS) limits its application. In this work, the new Sr0.7Bi0.2TiO3@xNaNb0.9Ta0.1O3 (x = 5–20 mol%, SBT@xNNT) relaxor ferroelectric ceramics with fine grains were prepared by a two-step sintering process. The introduction of NNT causes the coexistence of multiphase in ceramics, which enhances the relaxation behavior and the temperature stability of energy storage. Meanwhile, the design of core–shell structure also improves the temperature stability of the ceramics. Thus, the energy density (Wrec) of 2.2 J/cm3 and η of 76% are achieved in Sr0.7Bi0.2TiO3@xNaNb0.9Ta0.1O3 ceramics at 249 kV/cm, and Wrec exhibits good temperature stability from 20 to 150 °C. The Sr0.7Bi0.2TiO3@xNaNb0.9Ta0.1O3 ceramics have excellent dielectric temperature stability (|Δε/ε20 °C|≤ 15%) at − 60–120 °C. The as-prepared SBT@10NNT ceramics are suitable for the application in dielectric ceramic capacitors. This study provides SBT-based ceramics for a novel strategy for optimizing the energy storage performance.
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The data that support the findings of this study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 21071115), the Shaanxi Province Natural Science Foundation Research Project (Grant No. 2020JZ-44 and 2021JZ-44), the Key Science and Technology Innovation Team of Shaanxi Province (2019TD-007), and the Doctoral Scientific Start-up Foundation of Yan’an University (YAU202213118).
Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 21071115), the Shaanxi Province Natural Science Foundation Research Project (Grant No. 2020JZ-44 and 2021JZ-44), the Key Science and Technology Innovation Team of Shaanxi Province (2019TD-007), and the Doctoral Scientific Start-up Foundation of Yan’an University (YAU202213118).
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Liu, L., Zhang, X., Wang, Y. et al. Enhanced energy storage performance of Sr0.7Bi0.2TiO3@ NaNb0.9Ta0.1O3 relaxor ferroelectrics via a synergistic optimization strategy. J Mater Sci: Mater Electron 34, 856 (2023). https://doi.org/10.1007/s10854-023-10252-w
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DOI: https://doi.org/10.1007/s10854-023-10252-w