周期铁电畴压电陶瓷的制备和频谱特性研究

研究了复合结构的周期铁电畴压电陶瓷以及通过外加电场反向极化法制 备的周期铁电畴压电陶瓷的厚度切变模式. 分析了两种方法制备的周期铁电畴 压电陶瓷的频谱特性, 得出了铁电畴周期结构可以很好地抑制来源于纵向或径 向振动的高次泛音的不良影响和通过外加电场反向极化法制备小周期铁电畴提 高厚度切变模式谐振频率的方法, 从而可以通过调整周期大小制备出在一定频 率范围内呈现出具有感性的压电陶瓷.

Fabrication of Piezoelectric Ceramics with Periodical Ferroelectric Domains and Its Frequency Response

The composite piezoelectric ceramics with periodical ferroelectric domains were prepared by traditional composite technology, and the bulk ceramics with periodical ferroelectric domains were produced by a periodically poling method. The thickness-shear resonance and frequency properties of those two kinds of periodical ferroelectric domain ceramics were investigated. It is concluded that periodical ferroelectric domain structure can effectively restrain the bad effect from longitudinal or radical high order harmonious oscillation, and thickness shear resonance frequency can be increased by the periodically poling method, therefore the piezoelectric ceramics with inductance characteristics could be produced by the method of resonance and anti-resonance .at some frequency region through adjusting the size of periodical ferroelectric domain.