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<p>A series of Ba<sub>0.7</sub>Sr<sub>0.2</sub>Ca<sub>0.1</sub>Cu<sub>0.9</sub><i>A</i><sub>0.1</sub>Si<sub>2</sub>O<sub>6</sub> (<i>A</i> = Zn, Zn<sub>1/2</sub>Mg<sub>1/2</sub>, Zn<sub>1/3</sub>Mg<sub>1/3</sub>Co<sub>1/3</sub>, Zn<sub>1/4</sub>Mg<sub>1/4</sub>Co<sub>1/4</sub>Ni<sub>1/4</sub>, Zn<sub>1/5</sub>Mg<sub>1/5</sub>Co<sub>1/5</sub>Ni<sub>1/5</sub>Mn<sub>1/5</sub>) ceramics were fabricated through the entropy configuration design strategy, and the influence of entropy variations on the dielectric properties of Ba<sub>0.7</sub>Sr<sub>0.2</sub>Ca<sub>0.1</sub>Cu<sub>0.9</sub><i>A</i><sub>0.1</sub>Si<sub>2</sub>O<sub>6</sub> ceramics was systematically investigated, and the optimization mechanism of dielectric property under entropy regulation was elucidated. Dense Ba<sub>0.7</sub>Sr<sub>0.2</sub>Ca<sub>0.1</sub>Cu<sub>0.9</sub><i>A</i><sub>0.1</sub>Si<sub>2</sub>O<sub>6</sub> ceramics with a tetragonal structure (<i>I41-acd</i>) were obtained by sintering at 960 ~ 980&#xa0;°C. The results showed that changing the entropy value can not only reduce the sintering temperature of Ba<sub>0.7</sub>Sr<sub>0.2</sub>Ca<sub>0.1</sub>Cu<sub>0.9</sub><i>A</i><sub>0.1</sub>Si<sub>2</sub>O<sub>6</sub> ceramics, but also adjust the temperature stability of the resonant frequency. Among them, the Ba<sub>0.7</sub>Sr<sub>0.2</sub>Ca<sub>0.1</sub>Cu<sub>0.9</sub>(Zn<sub>1/5</sub>Mg<sub>1/5</sub>Co<sub>1/5</sub>Ni<sub>1/5</sub>Mn<sub>1/5</sub>)<sub>0.1</sub>Si<sub>2</sub>O<sub>6</sub> ceramic fired at 960&#xa0;°C exhibited the best microwave dielectric properties (<i>τ</i><sub><i>f</i></sub> = −&#xa0;9.6&#xa0;ppm/°C, <i>ε</i><sub>r</sub> = 7.94, <i>Q</i> × <i>f</i> = 14,978&#xa0;GHz). This indicates that the resonant frequency temperature stability of Ba<sub>0.7</sub>Sr<sub>0.2</sub>Ca<sub>0.1</sub>Cu<sub>0.9</sub><i>A</i><sub>0.1</sub>Si<sub>2</sub>O<sub>6</sub> ceramics can be optimized by adjusting the A-site entropy value, and this strategy has broad application prospects in the development of high-temperature stability microwave dielectric ceramics.</p>

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Enhanced temperature stability of resonant frequency of Ba0.7Sr0.2Ca0.1Cu0.9A0.1Si2O6 microwave dielectric ceramic by entropy configuration regulation

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Chen-chen Yang,
  • Wei Hu,
  • Jia-ying Li,
  • Zi-long Zhao,
  • Cheng-han Lei,
  • Li-hua Li,
  • Jin-liang Huang,
  • Bok-hee Kim,
  • Yong-jun Gu

摘要

A series of Ba0.7Sr0.2Ca0.1Cu0.9A0.1Si2O6 (A = Zn, Zn1/2Mg1/2, Zn1/3Mg1/3Co1/3, Zn1/4Mg1/4Co1/4Ni1/4, Zn1/5Mg1/5Co1/5Ni1/5Mn1/5) ceramics were fabricated through the entropy configuration design strategy, and the influence of entropy variations on the dielectric properties of Ba0.7Sr0.2Ca0.1Cu0.9A0.1Si2O6 ceramics was systematically investigated, and the optimization mechanism of dielectric property under entropy regulation was elucidated. Dense Ba0.7Sr0.2Ca0.1Cu0.9A0.1Si2O6 ceramics with a tetragonal structure (I41-acd) were obtained by sintering at 960 ~ 980 °C. The results showed that changing the entropy value can not only reduce the sintering temperature of Ba0.7Sr0.2Ca0.1Cu0.9A0.1Si2O6 ceramics, but also adjust the temperature stability of the resonant frequency. Among them, the Ba0.7Sr0.2Ca0.1Cu0.9(Zn1/5Mg1/5Co1/5Ni1/5Mn1/5)0.1Si2O6 ceramic fired at 960 °C exhibited the best microwave dielectric properties (τf = − 9.6 ppm/°C, εr = 7.94, Q × f = 14,978 GHz). This indicates that the resonant frequency temperature stability of Ba0.7Sr0.2Ca0.1Cu0.9A0.1Si2O6 ceramics can be optimized by adjusting the A-site entropy value, and this strategy has broad application prospects in the development of high-temperature stability microwave dielectric ceramics.