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首页> 外文期刊>Journal of Materials Science. Materials in Electronics >Dielectric properties of BSTO/MgO ceramic composites
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Dielectric properties of BSTO/MgO ceramic composites

机译：BSTO / MgO陶瓷复合材料的介电性能

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摘要

Ba0.55Sr0.45TiO3/MgO ceramic composites with 50wt% MgO content were studied in terms of the phase distribution, microstructure and electric properties, prepared by traditional ceramic process-solid phase synthesis. The results show that a small amount of Mg2+ ions have entered BSTO lattices to substitute for Ti4+ and behave as electron acceptors, contributing to the decrease of the dielectric loss. Ba-0.55 Sr0.45TiO3/MgO composites in the paraelectric state at room temperature still have a high tunability because of a field-induced hardening of the soft phonon and the presence of micro- or nano-polar phases in the paraelectric phase. For Ba0.55Sr0.45TiO3/MgO ceramic composites, the microwave loss at 2.5 GHz is 7.1 x 10(-3) and the value of tunability is 13.8% with the external DC field 4 kV center dot mm(-1). It can basically meet the requirements of phase shifters working at microwave frequencies. The phase shift of 122 degrees was obtained at 9.2 GHz using the designed phase shifter with the bias voltage 2 kV.mm(-1).
机译：研究了传统陶瓷工艺-固相合成法制备的MgO含量为50wt％的Ba0.55Sr0.45TiO3 / MgO陶瓷复合材料的相分布，微观结构和电性能。结果表明，少量的Mg2 +离子已进入BSTO晶格以替代Ti4 +并充当电子受体，从而有助于降低介电损耗。在室温下处于顺电状态的Ba-0.55 Sr0.45TiO3 / MgO复合材料仍然具有较高的可调谐性，这是由于场致使软声子硬化并且在顺电相中存在微极性或纳米极性相。对于Ba0.55Sr0.45TiO3 / MgO陶瓷复合材料，在外部DC场为4 kV中心点mm（-1）时，2.5 GHz的微波损耗为7.1 x 10（-3），可调谐度值为13.8％。它基本可以满足在微波频率下工作的移相器的要求。使用偏置电压为2 kV.mm（-1）的设计移相器，在9.2 GHz下获得了122度的相移。

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