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(1–x)K0.5Na0.5NbO3–xCa0.3Ba0.7TiO3无铅压电陶瓷的相变行为及其电性能

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Abstract:

采用固相法制备了(1–x)K0.5Na0.5NbO3–xCa0.3Ba0.7TiO3[(1–x)KNN–xCBT]系列无铅压电陶瓷,研究了CBT的含量(x=0~0.08)对样品的物相结构、显微形貌、介电性能以及压电性能的影响。结果表明所有样品都具有钙钛矿结构;随着x的增加,室温下样品从正交相逐渐向四方相过渡并且Curie温度向低温方向移动,样品的压电常数d33与机电耦合系数kp均先升高后降低。(1–x)KNN–xCBT多晶型转变位于0.03≤x≤0.04,当x=0.03时,样品的压电性能达到最佳d33=142pC/N,kp=40%,其介电损耗tanδ从室温到380℃范围内几乎不变且小于0.05,表明组分为x=0.03的陶瓷是一种非常有前景的无铅压电材料。

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