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Dielectric characteristics of pressureless sintered AlN-based composites in the 3–37 GHz frequency range

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Abstract

In a system of dielectric matrix–conducting particles, the dielectric characteristics are analyzed over a wide frequency range (3–37 GHz). Experimental values of the dielectric constant ε′ and dielectric loss tangent tanδ are presented for pressureless sintered AlN-based composites with different contents of the conducting particles (Mo, W, and TiN) within the interval from 0% to the percolation threshold. Both the real ε′ and imaginary ε″ parts of the dielectric constant of the investigated composites monotonically increased, reaching maximum values (ε′ = 15 – 26.5, ε″ = 0.14–0.28) when the content of the conductive particles approached the percolation threshold. The dielectric loss tangent of the composites, depending on the conducting particle content, reached values of 0.0085 for AlN–16.6%Mo, 0.0095 for AlN–16%W, and 0.0105 for AlN–20.4%TiN. The dielectric losses ε″ in the AlN-based composites, as long as they remain nonconductive for the direct current, are low compared to losses of ε″ = 0.04 in polycrystalline AlN ceramics and exceed them by only 4–7 times. A relationship between the dielectric losses and the level of microwave absorption has been established. The dielectric characteristics, electrical resistance, and thermal conductivity of the produced AlN-based composites and their achievement of a high absorption of the microwave radiation (L = 23–32 dB/cm) make these materials promising bulk absorbers in microwave devices (TWTs, klystrons).

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Authors and Affiliations

  1. ORION State Research Institute, 8A Tsedika Str., Kyiv, 03057, Ukraine

    Vasyl Chasnyk

  2. Research Institute of Special Equipment and Forensic Expertise, Security Service of Ukraine, (ISEE SSU), 3 Vasylenka Str., Kyiv, 03113, Ukraine

    Dmytro Chasnyk

  3. V.Bakul Institute for Superhard Materials, National Academy of Sciences of Ukraine, 2 Avtozavodska Str., Kyiv, 04074, Ukraine

    Igor Fesenko, Oksana Kaidash & Volodymyr Turkevych

  4. Kyiv, Ukraine

    Oksana Kaidash

Authors
  1. Vasyl Chasnyk
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  2. Dmytro Chasnyk
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  3. Igor Fesenko
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  4. Oksana Kaidash
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  5. Volodymyr Turkevych
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Correspondence to Oksana Kaidash.

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Chasnyk, V., Chasnyk, D., Fesenko, I. et al. Dielectric characteristics of pressureless sintered AlN-based composites in the 3–37 GHz frequency range. J Mater Sci: Mater Electron 32, 2524–2534 (2021). https://doi.org/10.1007/s10854-020-05019-6

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  • DOI: https://doi.org/10.1007/s10854-020-05019-6

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