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<p>Aiming at suppressing the porous structure and the second phase induced by the lithium volatilization, non-stoichiometry and sintering additive were simultaneously used to fabricate Li<sub>2</sub>Mg<sub>2.92</sub>Sn<sub>0.96</sub>O<sub>6</sub>-x LiF(x = 0–4 wt%) ceramics. The influences of LiF on sintering behavior, structural composition, microstructure and dielectric characteristics of Li<sub>2</sub>Mg<sub>2.92</sub>Sn<sub>0.96</sub>O<sub>6</sub> were systematically investigated. The results indicated that appropriate LiF addition can reduce sintering temperature from 1350&#xa0;°C to 900&#xa0;°C. X-ray diffraction (XRD) and refinement analysis demonstrated that samples maintain the single solid solution structure within 0 wt% ≤ x ≤ 4 wt%. The scanning electron microscope (SEM) results showed that the pore structure gradually disappeared and the grain size of Li<sub>2</sub>Mg<sub>2.92</sub>Sn<sub>0.96</sub>O<sub>6</sub>-x LiF samples decreased progressively with the amount of LiF increased. Both <i>ε</i><sub><i>r</i></sub> and <i>Q×f</i> exhibited the variation trend of increasing first and then decreasing, which was strongly correlated with the density, ionic polarization and grain size. Particularly, Li<sub>2</sub>Mg<sub>2.92</sub>Sn<sub>0.96</sub>O<sub>6</sub> samples added with 3 wt% LiF obtained outstanding microwave dielectric characteristics at 925&#xa0;°C: <i>ε</i><sub><i>r</i></sub> = 11.33, <i>Q×f</i> = 113,300&#xa0;GHz and <i>τ</i><sub><i>f</i></sub> =- 31.79 ppm/°C.</p>

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The effects of LiF addition on the structure, microstructure evolution and dielectric characteristics of Li2Mg2.92Sn0.96O6 ceramics

  • 期刊论文

  • 发表日期：

    2026年6月20日

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  • Jinyang Li,
  • Xiaolei Shi,
  • Cheng Liu

摘要

Aiming at suppressing the porous structure and the second phase induced by the lithium volatilization, non-stoichiometry and sintering additive were simultaneously used to fabricate Li2Mg2.92Sn0.96O6-x LiF(x = 0–4 wt%) ceramics. The influences of LiF on sintering behavior, structural composition, microstructure and dielectric characteristics of Li2Mg2.92Sn0.96O6 were systematically investigated. The results indicated that appropriate LiF addition can reduce sintering temperature from 1350 °C to 900 °C. X-ray diffraction (XRD) and refinement analysis demonstrated that samples maintain the single solid solution structure within 0 wt% ≤ x ≤ 4 wt%. The scanning electron microscope (SEM) results showed that the pore structure gradually disappeared and the grain size of Li2Mg2.92Sn0.96O6-x LiF samples decreased progressively with the amount of LiF increased. Both εr and Q×f exhibited the variation trend of increasing first and then decreasing, which was strongly correlated with the density, ionic polarization and grain size. Particularly, Li2Mg2.92Sn0.96O6 samples added with 3 wt% LiF obtained outstanding microwave dielectric characteristics at 925 °C: εr = 11.33, Q×f = 113,300 GHz and τf =- 31.79 ppm/°C.