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Enhanced breakdown strength and dielectric loss of Ca1−3x/2EuxCu3Ti4O12 ceramics prepared by polymer pyrolysis

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Abstract

The CaCu3Ti4O12 (CCTO) ceramic is characterized by high dielectric constant, but its elevated dielectric loss (tanδ) and low breakdown field strength (Eb) limit its practical applications in small electronic devices. Therefore, Ca1−3x/2EuxCu3Ti4O12 (x = 0, 0.2, 0.4, and 0.6) samples were prepared through a combined strategy of substituting with rare earth element and polymer pyrolysis method to improve the tanδ and Eb. XRD analysis revealed that main phase of CCTO was formed in all samples, and Eu3+ ions were incorporated into the lattice. These results suggest that the low concentrations of Eu facilitate grain growth. However, as the concentration increases, it begins to have an inhibitory effect on grain growth, consequently resulting in an elevated grain boundary density. Moreover, the results demonstrated that the addition of Eu enhanced the Eb, reduced the tanδ, and improved the temperature stability of the CCTO ceramics. Interestingly, impedance analysis reveals a notable enhancement in grain boundary resistance. Notably, the Ca0.4Eu0.4Cu3Ti4O12 sample demonstrated an exceptionally high grain boundary resistance of 6.62 × 1010 Ω cm, surpassing that of pure CCTO by over 100-fold. Ca1−3x/2EuxCu3Ti4O12 ceramics possess low loss and high breakdown performance, making them promising materials in capacitors.

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Data availability

The datasets generated during and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51701136 and 51977137), Shanxi Province Natural Science Foundation (Grant Nos. 201901D211044, 202103021224115, and 201901D211043).

Funding

This study was supported by National Natural Science Foundation of China (Grant Nos. 51701136 and 51977137), Shanxi Province Natural Science Foundation (Grant Nos. 201901D211044, 202103021224115, and 201901D211043), Shanxi Province “1331 Project” Improve Quality and Efficiency Construction Plan (Grant No. JinJiaoKe[2021] No. 4).

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Authors and Affiliations

  1. Shanxi Key Laboratory of Coal Mining Equipment and Safety Control, National & Provincial Joint Engineering Laboratory of Mining Intelligent Electrical Apparatus Technology, College of Electrical and Power Engineering, Taiyuan University of Technology, No. 79 Yingze West Avenue, Wanbailin District, Taiyuan, 030024, Shanxi, People’s Republic of China

    Jianhua Zhang, Tao Deng, Peng Li, Yalu Lv, Yanxin Nan, Zhipeng Lei, Yuanyuan Li & Lu Li

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  1. Jianhua Zhang
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by TD and PL. The first draft of the manuscript was written by JZ and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Jianhua Zhang.

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Zhang, J., Deng, T., Li, P. et al. Enhanced breakdown strength and dielectric loss of Ca1−3x/2EuxCu3Ti4O12 ceramics prepared by polymer pyrolysis. J Mater Sci: Mater Electron 35, 246 (2024). https://doi.org/10.1007/s10854-024-12001-z

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