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<p>LiAl<sub>1 − <i>x</i></sub>Mg<sub><i>x</i></sub>O<sub>2−<i>x</i>/2</sub> (<i>x</i> = 0, 0.01, 0.02, 0.03, 0.04, 0.05) ceramic were prepared by conventional solid-phase reaction method. After X-ray diffraction analysis, a single-phase solid solution was formed in this system throughout the doping range. Through the oxygen vacancies formation by the replacement of Al<sup>3+</sup> with Mg<sup>2+</sup>, the relative density was increased from 94.33% to 96.1%. The dielectric constant (<i>ε</i><sub><i>r</i></sub>) showed a trend of first enhancing and then decreasing with doping concentration. Their relationship mainly depended on the synergistic effect of relative density and dielectric polarizability. The improvement in the quality factor (<i>Q×f</i>) from 15,647&#xa0;GHz to 34,507&#xa0;GHz was attributed to the increased doping ratio and the strengthened covalent bonds. The change in the temperature coefficient of resonance frequency (<i>τ</i><sub><i>f</i></sub>) was explained from the perspective of oxygen bonding valence. Excellent microwave properties were <i>ε</i><sub><i>r</i></sub> = 6.59, <i>Q×f</i> = 34,507&#xa0;GHz, and <i>τ</i><sub><i>f</i></sub> = -115.8 ppm/°C for LiAl<sub>0.97</sub>Mg<sub>0.03</sub>O<sub>1.985</sub> ceramic at 1325&#xa0;°C for 5&#xa0;h.</p>

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Enhancing the microwave performance of LiAlO2 ceramics with low dielectric constant via Mg substitution

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Wenjie Zhou,
  • Yun Zhang,
  • Zezhen Yin,
  • Jing Yang,
  • Shihua Ding

摘要

LiAl1 − xMgxO2−x/2 (x = 0, 0.01, 0.02, 0.03, 0.04, 0.05) ceramic were prepared by conventional solid-phase reaction method. After X-ray diffraction analysis, a single-phase solid solution was formed in this system throughout the doping range. Through the oxygen vacancies formation by the replacement of Al3+ with Mg2+, the relative density was increased from 94.33% to 96.1%. The dielectric constant (εr) showed a trend of first enhancing and then decreasing with doping concentration. Their relationship mainly depended on the synergistic effect of relative density and dielectric polarizability. The improvement in the quality factor (Q×f) from 15,647 GHz to 34,507 GHz was attributed to the increased doping ratio and the strengthened covalent bonds. The change in the temperature coefficient of resonance frequency (τf) was explained from the perspective of oxygen bonding valence. Excellent microwave properties were εr = 6.59, Q×f = 34,507 GHz, and τf = -115.8 ppm/°C for LiAl0.97Mg0.03O1.985 ceramic at 1325 °C for 5 h.