硅酸盐学报

激励方式对锆钛酸铅钡锶陶瓷压电陶瓷介电性能的影响

单位：1. 昆山攀特电陶科技有限公司江苏昆山 215300 2. 江苏大学材料科学与工程学院江苏镇江 212013

分类号：TM282

出版年,卷(期):页码：2014,42(8):00-00

DOI：

摘要：

采用扎膜工艺和固相反应法制备了(Pb0.70Ba0.26Sr0.04)(Zr0.52 Ti0.48)O3（PBSZT）压电陶瓷。通过扫描电镜和X射线衍射表征PBSZT陶瓷的结构和物相组成，用电容介损测试仪表征压电陶瓷的介质性能与激励场强，通过自建电路集成直流电源、标准电容，在低频频率特性测试仪上得到偏场强度对压电陶瓷介电性能的影响关系。结果表明：压电陶瓷材料的介电性能随着加载的电场强度的增大先逐渐升高，而后出现拐点开始降低；在偏压电场中，自由电容CT随正向偏场强度的增加逐渐减小，但随着反向偏场强度的增加逐渐增大。tan δ则随着正、反偏场强度的增加均呈现上升；压电陶瓷的机电耦合系数与偏场强度的关系，以零点为界，随着负偏场增强，Kp略显下降，反之，随正偏场增强，Kp缓慢增大。因此，压电陶瓷应用时应避开强场损耗高点；并在环境中施加正向偏场，有助于抑制压电陶瓷性能衰减。

The (Pb0.70Ba0.26Sr0.04)(Zr0.52 Ti0.48)O3（PBSZT）piezo ceramics were prepared by the roll formation and solid-state reaction process. The microstructure and phase compositions of the ceramics were investigated by scanning electron microscopy and X-ray diffraction. The relationships between dielectric properties (CT, tanδ) and electric field strength，electromechanical coupling coefficient and bias field strength were investigated. The results show that the CT and tanδ increases gradually then reduces dramatically with enhancing electric field strength, In the bias field, the CT decreases with enhancing the positive bias field strength, while increases with enhancing the negative bias field strength, and tanδ rises both in the positive bias field and the negative bias field, the Kp increases with enhancing the positive bias field strength while varies to same trend with reducing the negative bias field strength. The conclusions instruct that it is important to avoid the high loss point, and it is good for restraining attenuation of the piezo capability while providing a positive bias field on piezo ceramics applications.

基金项目：

作者简介：

通信作者：范景波(1985—)，男，硕士，工程师。

参考文献：

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