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Dielectric properties of novel high-entropy (La0.2Li0.2Ba0.2Sr0.2Ca0.2)Nb2O6-δ tungsten bronze ceramics

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Abstract

Novel high-entropy (La0.2Li0.2Ba0.2Sr0.2Ca0.2)Nb2O6-δ tungsten bronze ceramics, fabricated by conventional solid-state reaction, were first studied to reveal the effects of sintering temperatures on the crystal structure, microstructure and dielectric properties of these ceramics. The results show that all the prepared ceramics have tetragonal tungsten bronze structures after sintering at 1250–1350 °C. With increasing sintering temperature, high density up to 93% theoretical and uniform grain distribution are obtained. The dielectric properties are apparently affected by both frequency and temperature, and all ceramics exhibit quintessential relaxation peaks and obvious frequency dispersion phenomena. The optimal value of dielectric constant εr reaches as high as 1.1 × 106 at 100 Hz and 625 °C for the ceramic sintered at 1250 °C, which is almost 1290 times that of the (Ba1/3Sr1/3Ca1/3)Nb2O6 ceramics under the same conditions. Furthermore, the temperature stability of dielectric constant can also be improved through high-entropy effect. The obtained results demonstrate that it is feasible to design high-entropy ceramics to improve the dielectric properties of ANb2O6 ceramics. We have reason to believe that entropy engineering is a credible strategy for tailoring properties of ceramic systems.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51972048), the Natural Science Foundation of Hebei Province (E2021501017), the Young Talents Program of Hebei Province (No. BJ2020202) and the Fundamental Research Funds for the Central Universities (No. N2123003).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, People’s Republic of China

    Xiaoyan Zhang, Jinsheng Li, Bo Ni, Rutong Yang, Huihui Xie & Shuzhen Yang

  2. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, People’s Republic of China

    Xiaoyan Zhang, Jinsheng Li, Bo Ni, Rutong Yang, Huihui Xie & Shuzhen Yang

  3. Key Laboratory of Dielectric and Electrolyte Functional Material, Hebei Province, Qinhuangdao, 066004, People’s Republic of China

    Xiaoyan Zhang & Jinsheng Li

  4. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063210, People’s Republic of China

    Xiwei Qi

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  1. Xiaoyan Zhang
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Zhang, X., Li, J., Ni, B. et al. Dielectric properties of novel high-entropy (La0.2Li0.2Ba0.2Sr0.2Ca0.2)Nb2O6-δ tungsten bronze ceramics. J Mater Sci 57, 15901–15912 (2022). https://doi.org/10.1007/s10853-022-07617-7

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