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Bond analysis of novel MnZrTa2O8 microwave dielectric ceramics with monoclinic structure

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Abstract

A new type of ceramic, namely MnZrTa2O8, was synthesized after sintering at high temperature in this work. The possible dielectric loss mechanism was discussed by Raman spectroscopy and chemical bond theory. X-ray diffraction indicated that MnZrTa2O8 formed through a reaction between ZrO2 and intermediate MnTa2O6. After sintering at 1350 °C, a monoclinic structure with cell parameters a = 4.8370(3) Å, b = 5.7163(1) Å, c = 5.1398(5) Å, β = 91.7219° was gained for ceramic. Among all bonds, Ta–O with the greatest bond ionicity and lattice energy was the dominant factor that influenced the microwave dielectric properties. The temperature coefficient of the resonant frequency τf changed from − 50.55 to − 41.21 ppm/ °C, which was related to the lattice energy. The effect of porosity on dielectric loss was also checked and found to be significant. MnZrTa2O8 ceramic exhibited relative permittivity εr ~ 23.0 and enhanced quality factor Q × f~48103 GHz (at 8.97 GHz), which provided a promising candidate for electric components.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51902268) and the Sichuan Science and Technology Program (2019YFG0234).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Xihua University, Chengdu, 610039, China

    Yun Zhang, Shihua Ding, Chao Li & Tianxiu Song

  2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Yingchun Zhang

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  1. Yun Zhang
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  2. Shihua Ding
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  3. Chao Li
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Correspondence to Yun Zhang.

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Zhang, Y., Ding, S., Li, C. et al. Bond analysis of novel MnZrTa2O8 microwave dielectric ceramics with monoclinic structure. J Mater Sci 55, 8491–8501 (2020). https://doi.org/10.1007/s10853-020-04629-z

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  • DOI: https://doi.org/10.1007/s10853-020-04629-z