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Dielectric loss and microwave absorbing properties of the prepared MgCu2Nb2O8 composite ceramics

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Abstract

MgCu2Nb2O8 composite ceramics were synthesized by the solid reaction sintering technology. Influences of the sintering temperature on phase composition, microstructure, and microwave absorption properties of the ceramics were investigated. The composite ceramic material exhibited remarkable microwave absorption characteristics, with optimal reflection loss of − 24.7 dB at 17.4 GHz and effective bandwidth of 1.5 GHz. Introduction of different phases in the composite material led to multiple interfaces and defects, enhancing the interface polarization and dipole polarization. Density Functional Theory (DFT) calculations were utilized to explore the mechanisms of dielectric loss. The results demonstrated significant reduction in the density of states (DOS) of the p orbitals near the Fermi level, while DOS of the d orbitals increased, resulting from disruption of local microstructural symmetry and induction of additional electric dipoles at the interfaces. The simulation results are consistent with the experimental results. Consequently, the microwave absorption capacity of the MgCu2Nb2O8 composite ceramics were significantly improved.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 21902186 and 21905305), and the Hunan Provincial Innovation Foundation For Postgraduate (Grant No. QL20210045). This work was supported in part by the High Performance Computing Center of Central South University

Funding

Funding were provided by National Natural Science Foundation of China (Grant Nos. 21902186, 21905305) and Hunan Provincial Innovation Foundation for Postgraduate (Grant No. QL20210045).

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Authors and Affiliations

  1. School of Physics and Electronics, Central South University, Changsha, 410083, China

    Chen Li, Lianwen Deng, Sen Peng, Leilei Qiu, Qizhao Wu & Shengxiang Huang

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  1. Chen Li
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  2. Lianwen Deng
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  3. Sen Peng
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  4. Leilei Qiu
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  5. Qizhao Wu
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Contributions

CL: Methodology, Formal analysis, Data curation, Writing original draft. LD: Conceptualization, Supervision, Funding acquisition, Writing-review and editing. SP: Formal analysis. LQ: Conceptualization, Writing-review & editing. QW: Data curation. SH: Supervision, Methodology.

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Correspondence to Shengxiang Huang.

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Li, C., Deng, L., Peng, S. et al. Dielectric loss and microwave absorbing properties of the prepared MgCu2Nb2O8 composite ceramics. J Mater Sci: Mater Electron 35, 305 (2024). https://doi.org/10.1007/s10854-024-11988-9

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