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Tunning the dielectric and energy storage properties of high entropy ceramics (Bi0.2Na0.2K0.2La0.2Sr0.2)(Ti1-xScx)O3 by Sc-doping at B-site in perovskite structure

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Abstract

The (Bi0.2Na0.2K0.2La0.2Sr0.2)(Ti1-xScx)O3 (BNKLST-xSc) high entropy ceramics (HECs) have been successfully synthesized via a citrate acid method. The effects of Sc-doping on the lattice structure, microstructural morphology, dielectric and energy-storage properties of HECs are comprehensively investigated. The results indicate that although Sc3+ doped at B-site does not alternate the perovskite structure of BNKLST with a single phase, it results in lattice expansion and weakened bonding in TiO6 octahedron. The dielectric constant of BNKLST-xSc is reduced while the dielectric relaxation is enhanced with increasing Sc content x, due to the enhanced structural inhomogeneity in nano-regions. In addition, the lattice structure of BNKLST-0.2Sc exhibits ultra-high thermal stability at 30–300 °C, which achieves the maximum energy storage density of 1.094 J/cm3 with an outstanding efficiency better than 80%, accompanying by the mechanical and dielectric losses as low as ~ 10–3. It is suggested that BNKLST-0.2Sc could be promising dielectric materials in capacitors and energy-storage devices with an excellent combination of ultrahigh power density, high energy density, thermal stability as well as low mechanical and dielectric losses.

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Acknowledgements

This research was supported by Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Foshan, Guangdong Province, China.

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  1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, 999077, Kowloon, Hong Kong, China

    Wentao Yang & Guangping Zheng

  2. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Foshan, China

    Wentao Yang & Guangping Zheng

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  1. Wentao Yang
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Correspondence to Guangping Zheng.

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Yang, W., Zheng, G. Tunning the dielectric and energy storage properties of high entropy ceramics (Bi0.2Na0.2K0.2La0.2Sr0.2)(Ti1-xScx)O3 by Sc-doping at B-site in perovskite structure. J Electroceram 49, 53–62 (2022). https://doi.org/10.1007/s10832-022-00292-9

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