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<p>SrF<sub>2</sub> is a promising low-permittivity fluoride with excellent microwave dielectric properties. Nevertheless, realizing densification in SrF<sub>2</sub> ceramics remains challenging due to their low surface energy. In this work, a series of SrF<sub>2</sub>–<i>x</i>wt%LiF (<i>x</i> = 0.5–20) ceramics were synthesized using the conventional solid-state reaction method. The incorporation of LiF effectively lowered the sintering temperature from 1050&#xa0;°C to 775&#xa0;°C and improved the relative density from 91% to 97.1%. Outstanding microwave dielectric properties (<i>ɛ</i><sub><i>r</i></sub> = 6.39, <i>Qf</i> = 71,024&#xa0;GHz at 20&#xa0;GHz and <i>τ</i><sub><i>f</i></sub> = −85.1&#xa0;ppm/°C) were achieved at <i>x</i> = 1.0, demonstrating great potential in millimeter-wave communication applications. In addition, the present ceramics demonstrated good chemical compatibility and a well-matched coefficient of thermal expansion with silver electrodes. Finite element simulations further revealed significantly reduced thermal stress when employing the present ceramics as substrates, highlighting the strong potential for high-reliability low temperature co-fired ceramic (LTCC) applications.</p>

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Low permittivity SrF2–xwt%LiF ceramics with low dielectric loss for high-reliability LTCC applications

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Chen Bo Wang,
  • Wei Ping Gong,
  • Jing Ye Jin,
  • Hao Nan Bai,
  • Yang Yang,
  • Qing Wei Zhou,
  • Xue Qing Yu,
  • Min Min Mao,
  • Lei Cao,
  • Kai Xin Song,
  • Bing Liu

摘要

SrF2 is a promising low-permittivity fluoride with excellent microwave dielectric properties. Nevertheless, realizing densification in SrF2 ceramics remains challenging due to their low surface energy. In this work, a series of SrF2–xwt%LiF (x = 0.5–20) ceramics were synthesized using the conventional solid-state reaction method. The incorporation of LiF effectively lowered the sintering temperature from 1050 °C to 775 °C and improved the relative density from 91% to 97.1%. Outstanding microwave dielectric properties (ɛr = 6.39, Qf = 71,024 GHz at 20 GHz and τf = −85.1 ppm/°C) were achieved at x = 1.0, demonstrating great potential in millimeter-wave communication applications. In addition, the present ceramics demonstrated good chemical compatibility and a well-matched coefficient of thermal expansion with silver electrodes. Finite element simulations further revealed significantly reduced thermal stress when employing the present ceramics as substrates, highlighting the strong potential for high-reliability low temperature co-fired ceramic (LTCC) applications.