Ba0.5Sr0.5TiO3-MgO-Mg3B2O6复合陶瓷的介电调谐性能研究
首发时间:2014-10-28
摘要:采用固相反应方法制备了Ba0.5Sr0.5TiO3-MgO-Mg3B2O6 复合合陶瓷,研究了其微结构和介电调谐性能。在Ba0.5Sr0.5TiO3中加入MgO-Mg3B2O6形成了铁电的Ba0.5Sr0.5TiO3和介电的MgO-Mg3B2O6复合物。随MgO含量增加,复合陶瓷的介电常数轻微增加,而介电损耗降低,调谐率增加。当MgO含量超过10wt%时,复合陶瓷的介电常数与电场强度的关系可以用极性团簇的非本征贡献来描述,而不是常用的Johnson近似。复合陶瓷在微波频率的介电常数和品质因数Q×f值随MgO含量的增加而倾向于增加。改进的调谐率和Q×f值对微波调谐应用有利。
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The dielectric tunability of Ba0.5Sr0.5TiO3-MgO-Mg3B2O6 composite ceramics
Abstract:Ba0.5Sr0.5TiO3-MgO-Mg3B2O6 composite ceramics were fabricated by a solid state reaction method and their dielectric tunable characteristics were investigated. The addition of MgO-Mg3B2O6 into Ba0.5Sr0.5TiO3 forms ferroelectric (Ba0.5Sr0.5TiO3)-dielectric (MgO-Mg3B2O6) composites. With the increase of the MgO content and the decrease of Mg3B2O6, the dielectric constant of composite ceramics increases slightly, meanwhile, the loss tangent decreases and the tunability increases. When MgO content exceeds 10wt%, the electric field dependence of the dielectric constant of composite ceramics is well described by an additional "extrinsic" contribution due to the polar clusters, instead of the Johnson's approximation. The dielectric constant and Q×f values of composite ceramics at microwave frequency tend to increase with the increase of MgO content. The improved tunability and Q×f values are beneficial for tunable microwave applications.
Keywords: Tunability composite ceramic ferroelectric
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Ba0.5Sr0.5TiO3-MgO-Mg3B2O6复合陶瓷的介电调谐性能研究
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