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The dielectric properties and dielectric mechanism of perovskite ceramic CLST/PTFE composites

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Abstract

Polytetrafluorethylene (PTFE) composites filled with perovskite (Ca,Li,Sm)TiO3 (CLST) dielectric ceramic of various volume fractions filler up to 60% were prepared. The effects of volume fraction of ceramic filler on the microstructure and dielectric properties of the composites have been investigated. A comparative study of dielectric properties of experiment and modeling analysis has been carried out at high frequencies for the CLST/PTFE composites. The results indicate that both the dielectric constant and the dielectric loss increase with the filler. The CLST/PTFE composite with 40% ceramic has exhibited good dielectric properties: ε r = 7.92 (~10 GHz), tan δ = 1.2 × 10−3 (~10 GHz), and τ f = −45 ppm/°C. The dielectric properties are obviously better than most composites reported previously at high frequencies in the aspects of dielectric loss and thermal stability. The dielectric constant and dielectric loss of composites predicted by the Rother–Lichtenecker equation and the general mixing model are in good agreement with the experiment data when the volume fraction of ceramic is less than 40%. When the volume fraction of the ceramic is more than 40%, the deviation occurs. By introducing the correction factor, the theoretical values of the dielectric constant agrees well with the experimental values.

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Acknowledgements

This work has been supported by the National Natural Science Foundation of China (51572205) and The Natural Science Foundation of Hubei Province, China (2014CFB854). The authors thank the Testing Center, Wuhan University of Technology for SEM measurements.

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Authors and Affiliations

  1. State Key Laboratory of Silicate Materials for Architectures, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Liu Zheng, Jing Zhou, Jie Shen & Yanyuan Qi

  2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Wen Chen

  3. Commonwealth Scientific and Industrial Research Organization (CSIRO), Manufacturing, Clayton, VIC, 3168, Australia

    Liu Zheng, Shirley Shen & Sheng Li

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  1. Liu Zheng
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  2. Jing Zhou
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  4. Wen Chen
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Correspondence to Jing Zhou or Shirley Shen.

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Zheng, L., Zhou, J., Shen, J. et al. The dielectric properties and dielectric mechanism of perovskite ceramic CLST/PTFE composites. J Mater Sci: Mater Electron 28, 11665–11670 (2017). https://doi.org/10.1007/s10854-017-6969-4

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  • DOI: https://doi.org/10.1007/s10854-017-6969-4

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