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<p>The temperature-stable fluoride oxide ceramics were prepared via the solid-phase reaction method. The ceramic structure comprised three phases: Li<sub>2</sub>Mg<sub>3</sub>Ti(O<sub>1−<i>x</i>/2</sub>F<sub><i>x</i></sub>)<sub>6</sub>, CaTiO<sub>3</sub> and MgTiO<sub>4</sub>. All samples exhibitied a dense microstructure after densification sintering with relative densities exceeding 94%. As the fluorine substitution ratio (<i>x</i>) increased from 0.02 to 0.08, the dielectric constant (<i>ε</i><sub><i>r</i></sub>) increased monotonically from 13.2 to 13.6, while the quality factor (<i>Q</i> × <i>f</i>) decreased from 58,040&#xa0;GHz to 30,820&#xa0;GHz. The temperature coefficient of the resonant frequency (<i>τ</i><sub><i>f</i></sub>) varied from −23.3&#xa0;ppm/°C to +22.6&#xa0;ppm/°C. By adjusting the fluorine substitution ratio <i>x</i>—particularly through optimization of the CaTiO₃ phase content—the material’s performance was effectively enhanced. The Li<sub>2</sub>O–3MgO–1.18TiO<sub>2</sub>–0.18CaF<sub>2</sub> ceramic system with <i>x</i> = 0.06 demonstrated optimal overall microwave dielectric properties: <i>ε</i><sub><i>r</i></sub> = 13.4, <i>Q</i> × <i>f</i> = 49,240&#xa0;GHz and <i>τ</i><sub><i>f</i></sub> = 3.01&#xa0;ppm/°C, characterized by a high quality factor, moderate dielectric constant and a near-zero temperature coefficient.</p>

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A novel temperature stable microwave dielectric ceramics: Li2O–MgO–TiO2–CaF2

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Zhifen Fu,
  • Xiangyi Li,
  • Juanhua Fang,
  • Chen Chen

摘要

The temperature-stable fluoride oxide ceramics were prepared via the solid-phase reaction method. The ceramic structure comprised three phases: Li2Mg3Ti(O1−x/2Fx)6, CaTiO3 and MgTiO4. All samples exhibitied a dense microstructure after densification sintering with relative densities exceeding 94%. As the fluorine substitution ratio (x) increased from 0.02 to 0.08, the dielectric constant (εr) increased monotonically from 13.2 to 13.6, while the quality factor (Q × f) decreased from 58,040 GHz to 30,820 GHz. The temperature coefficient of the resonant frequency (τf) varied from −23.3 ppm/°C to +22.6 ppm/°C. By adjusting the fluorine substitution ratio x—particularly through optimization of the CaTiO₃ phase content—the material’s performance was effectively enhanced. The Li2O–3MgO–1.18TiO2–0.18CaF2 ceramic system with x = 0.06 demonstrated optimal overall microwave dielectric properties: εr = 13.4, Q × f = 49,240 GHz and τf = 3.01 ppm/°C, characterized by a high quality factor, moderate dielectric constant and a near-zero temperature coefficient.