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<p>In order to optimize the porous structure and impurity phase caused by lithium volatilization, zirconium deficiency and sintering agent addition were adopted simultaneously to prepare Li<sub>2</sub>Mg<sub>3</sub>Zr<sub>0.94</sub>O<sub>6</sub>—x LiF(x = 0w–5t.%) samples. The effects of LiF on structural composition, morphology, and dielectric characteristics of Li<sub>2</sub>Mg<sub>3</sub>Zr<sub>0.94</sub>O<sub>6</sub> were studied. The results showed that modest LiF can reduce sintering temperature from 1375 to 900&#xa0;°C. XRD and refinement analysis demonstrated that the samples retain a single rock salt structure within 2 wt.% ≤ x ≤ 4 wt.%. The SEM analysis confirmed that the porosity and grain size of Li<sub>2</sub>Mg<sub>3</sub>Zr<sub>0.94</sub>O<sub>6</sub>–x LiF samples gradually decreased with increasing LiF. The <i>ε</i><sub><i>r</i></sub> and <i>Q</i> × <i>f</i> exhibited a trend of initially increasing and then decreasing, which was closely related to the ionic polarization, phase composition, porosity and grain size. Particularly, Li<sub>2</sub>Mg<sub>3</sub>Zr<sub>0.94</sub>O<sub>6</sub>–4 wt.% LiF sample displayed excellent dielectric characteristics at 900&#xa0;°C:<i> ε</i><sub><i>r</i></sub> = 13.66, <i>Q</i> × <i>f</i> = 99,800&#xa0;GHz (10.06 GHZ) and <i>τ</i><sub><i>f</i></sub> =  − 27.65&#xa0;ppm/°C.</p>

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Improved density and dielectric characteristics of Li2Mg3ZrO6-based ceramics by zirconium deficiency and LiF addition

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Jinyang Li,
  • Xiaolei Shi,
  • Cheng Liu

摘要

In order to optimize the porous structure and impurity phase caused by lithium volatilization, zirconium deficiency and sintering agent addition were adopted simultaneously to prepare Li2Mg3Zr0.94O6—x LiF(x = 0w–5t.%) samples. The effects of LiF on structural composition, morphology, and dielectric characteristics of Li2Mg3Zr0.94O6 were studied. The results showed that modest LiF can reduce sintering temperature from 1375 to 900 °C. XRD and refinement analysis demonstrated that the samples retain a single rock salt structure within 2 wt.% ≤ x ≤ 4 wt.%. The SEM analysis confirmed that the porosity and grain size of Li2Mg3Zr0.94O6–x LiF samples gradually decreased with increasing LiF. The εr and Q × f exhibited a trend of initially increasing and then decreasing, which was closely related to the ionic polarization, phase composition, porosity and grain size. Particularly, Li2Mg3Zr0.94O6–4 wt.% LiF sample displayed excellent dielectric characteristics at 900 °C: εr = 13.66, Q × f = 99,800 GHz (10.06 GHZ) and τf =  − 27.65 ppm/°C.