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<p>To investigate the effect of composite material structure on dielectric tunability, this study used polysilylaryl-enyne (PSAE) as the matrix and Ba<sub>0.7</sub>Sr<sub>0.3</sub>TiO<sub>3</sub> as the filler to prepare parallel structure composites and 0–3 composites via freeze casting and the direct mixing method, respectively. The microstructures of the two models were compared and their dielectric tunability and thermal conductivity were measured. When the Ba<sub>0.7</sub>Sr<sub>0.3</sub>TiO<sub>3</sub> ceramic volume fraction is 40%, the relative permittivity of the 0–3 composite is 26, with a dielectric loss of 0.018(@1&#xa0;kHz), a dielectric tunability of 5.47%, and a thermal conductivity of 0.824 W/(m·K). By contrast, the parallel structure composite with a Ba<sub>0.7</sub>Sr<sub>0.3</sub>TiO<sub>3</sub> ceramic volume fraction of 37.25% exhibits a relative permittivity of 1110, a dielectric loss of 0.016, a dielectric tunability of 50.38%, and a thermal conductivity of 1.037 W/(m·K). Therefore, due to its high dielectric tunability and thermal conductivity, the parallel Ba<sub>0.7</sub>Sr<sub>0.3</sub>TiO<sub>3</sub>/PSAE composite material shows promising application prospects in phase shifters, tunable capacitors, sensors, and other fields.</p>

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Parallel structure design of Ba0.7Sr0.3TiO3/polysilylaryl-enyne composites with high tunability

  • 期刊论文

  • 发表日期：

    2025年4月27日

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  • Xianwei Chen,
  • Yujie Yang,
  • Huixing Lin,
  • Xiaogang Yao,
  • Daihua He,
  • Haiyi Peng

摘要

To investigate the effect of composite material structure on dielectric tunability, this study used polysilylaryl-enyne (PSAE) as the matrix and Ba0.7Sr0.3TiO3 as the filler to prepare parallel structure composites and 0–3 composites via freeze casting and the direct mixing method, respectively. The microstructures of the two models were compared and their dielectric tunability and thermal conductivity were measured. When the Ba0.7Sr0.3TiO3 ceramic volume fraction is 40%, the relative permittivity of the 0–3 composite is 26, with a dielectric loss of 0.018(@1 kHz), a dielectric tunability of 5.47%, and a thermal conductivity of 0.824 W/(m·K). By contrast, the parallel structure composite with a Ba0.7Sr0.3TiO3 ceramic volume fraction of 37.25% exhibits a relative permittivity of 1110, a dielectric loss of 0.016, a dielectric tunability of 50.38%, and a thermal conductivity of 1.037 W/(m·K). Therefore, due to its high dielectric tunability and thermal conductivity, the parallel Ba0.7Sr0.3TiO3/PSAE composite material shows promising application prospects in phase shifters, tunable capacitors, sensors, and other fields.