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BaWO4/(Ba|Sr)TiO3复合陶瓷的显微结构与介电性能

Microstructure and dielectric properties at lowfrequency of BaWO4/(B a|Sr)TiO3 ceramic composites

    摘要
  • 摘要: 采用常规的陶瓷工艺制备了BaWO4/(Ba，Sr)TiO3复合陶瓷，并通过X射线衍射、扫描电镜及介电性能测试对陶瓷的烧结特性、微结构和介电性能进行了研究。结果表明，BaWO4/(Ba，Sr)TiO3复合陶瓷在1250～1300℃ 可以实现致密化烧结，且陶瓷由(Ba，Sr)TiO3和BaWO4两相复合而成，未检测到其它物相。随着BaWO4含量的增加，材料的表观密度逐渐增大，介电常数和可调度逐渐降低，介电损耗变化不大，均在10-3量级。典型样品(60 %BaWO4/40%Ba 0.5Sr 0.5TiO3 , 质量分数)介电常数182.7，介电损耗0.0024，在2V·μm-1偏置电场下的可调度为14.7%，具有较好的介电性能。

     

    Abstract: The new ceramic composites of BaWO4/(B a，Sr)TiO3 were successfully fabricated by a standard ceramic
    processing. The sintering properties，microstructure and the dielectric properties of BaWO4/(Ba，Sr )TiO3 were systemically studied by means of XRD，SEM and property measurement. The results show that BaWO4/(Ba，Sr)TiO3 could be well sintered at 1250～1350℃ without chemical reaction between perovskite and scheelite phases. With the BaWO4 mass fraction increasing，the density of the ceramic composites increases apparently，the dielectric permit tivity and tunability decrease gradually，and the dielectric loss has a slight change at the grade of 10-3. Typically，for the sample with 60% BaWO4 and 40% Ba 0.5Sr 0.5TiO3(mass fraction)，the tunability under external  DC field of 2 V·μm-1 is 14.7%，and the dielectric constant and dielectric loss are 182.7 and 0.0024 separately，which presents excellent properties and can basically meet the requirements of phased array applications.

     

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