Scholarlink

<p>A series of high-entropy ceramics with the nominal composition (Mg<sub>0.5</sub>Zn<sub>0.5</sub>)<sub>0.4+<i>x</i></sub>Li<sub>0.4</sub>(Ca<sub>0.5</sub>Sr<sub>0.5</sub>)<sub>0.4−<i>x</i></sub>TiO<sub>3</sub> (0 ≤ <i>x</i> ≤ 0.4) has been successfully synthesized using the conventional solid-phase method. The (Mg<sub>0.5</sub>Zn<sub>0.5</sub>)<sub>0.4+<i>x</i></sub>Li<sub>0.4</sub>(Ca<sub>0.5</sub>Sr<sub>0.5</sub>)<sub>0.4−<i>x</i></sub>TiO<sub>3</sub> ceramics are confirmed to be composed of the main phase (Zn,Mg,Li)TiO<sub>3</sub> and the secondary phase Ca<sub>0.5</sub>Sr<sub>0.5</sub>TiO<sub>3</sub> by X-ray diffractometer, Rietveld refinement, and X-ray spectroscopy analysis. The quality factor (<i>Q</i>×<i>f</i>) of the samples is inversely proportional to the content of the Ca<sub>0.5</sub>Sr<sub>0.5</sub>TiO<sub>3</sub> phase, and it is influenced by the density. The secondary phase and molecular polarizability (<i>α</i><sub>T</sub>) have a significant impact on the dielectric constant (<i>ε</i><sub>r</sub>) of the samples. Moreover, the temperature coefficient of resonant frequency (<i>τ</i><sub>f</sub>) of the samples is determined by the distortion of [TiO<sub>6</sub>] octahedra and the secondary phase. The results indicate that (Mg<sub>0.5</sub>Zn<sub>0.5</sub>)<sub>0.4+<i>x</i></sub>Li<sub>0.4</sub>(Ca<sub>0.5</sub>Sr<sub>0.5</sub>)<sub>0.4−<i>x</i></sub>TiO<sub>3</sub> ceramics achieve ideal microwave dielectric properties (<i>ε</i><sub>r</sub> = 17.6, <i>Q</i>×<i>f</i> = 40900 GHz, <i>τ</i><sub>f</sub> = −8.6 ppm/°C) when <i>x</i> = 0.35. (Mg<sub>0.5</sub>Zn<sub>0.5</sub>)<sub>0.4+<i>x</i></sub>Li<sub>0.4</sub>(Ca<sub>0.5</sub>Sr<sub>0.5</sub>)<sub>0.4−<i>x</i></sub>TiO<sub>3</sub> ceramics possess the potential for application in wireless communication, and a new approach has been provided to enhance the performance of microwave dielectric ceramics.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Temperature-stabilized novel high-entropy microwave dielectric (Mg0.5Zn0.5)0.4+xLi0.4(Ca0.5Sr0.5)0.4−xTiO3 ceramics

  • 期刊论文

  • 发表日期：

    2025年8月15日

查看全文
  • Xingyue Liao,
  • Yuanming Lai,
  • Huan Huang,
  • Mingjun Xie,
  • Weiping Gong,
  • Yuanxun Li,
  • Qian Liu,
  • Chongsheng Wu,
  • Jiao Han,
  • Yiming Zeng

摘要

A series of high-entropy ceramics with the nominal composition (Mg0.5Zn0.5)0.4+xLi0.4(Ca0.5Sr0.5)0.4−xTiO3 (0 ≤ x ≤ 0.4) has been successfully synthesized using the conventional solid-phase method. The (Mg0.5Zn0.5)0.4+xLi0.4(Ca0.5Sr0.5)0.4−xTiO3 ceramics are confirmed to be composed of the main phase (Zn,Mg,Li)TiO3 and the secondary phase Ca0.5Sr0.5TiO3 by X-ray diffractometer, Rietveld refinement, and X-ray spectroscopy analysis. The quality factor (Q×f) of the samples is inversely proportional to the content of the Ca0.5Sr0.5TiO3 phase, and it is influenced by the density. The secondary phase and molecular polarizability (αT) have a significant impact on the dielectric constant (εr) of the samples. Moreover, the temperature coefficient of resonant frequency (τf) of the samples is determined by the distortion of [TiO6] octahedra and the secondary phase. The results indicate that (Mg0.5Zn0.5)0.4+xLi0.4(Ca0.5Sr0.5)0.4−xTiO3 ceramics achieve ideal microwave dielectric properties (εr = 17.6, Q×f = 40900 GHz, τf = −8.6 ppm/°C) when x = 0.35. (Mg0.5Zn0.5)0.4+xLi0.4(Ca0.5Sr0.5)0.4−xTiO3 ceramics possess the potential for application in wireless communication, and a new approach has been provided to enhance the performance of microwave dielectric ceramics.