Theoretical and experimental investigations of thickness- stretch modes in 1-3 piezoelectric composites

4th Global Conference on Materials Science and Engineering

Yang, Z.T.^1 ; Zeng, D.P.^1 ; He, M.^1 ; Wang, H.^1

College of Biomedical Engineering, State Key Laboratory of Ultrasound Engineering in Medicine, Chongqing and MOST, Chongqing Municipal Key Laboratory of Ultrasound Engineering in Medicine, Chongqing Medical University, Chongqing

400016, China^1

关键词: 1-3 piezoelectric composite;    Electrical impedance;    Experimental investigations;    Linear piezoelectricity;    Multiphase ceramics;    Piezoelectric samples;    Theoretical modeling;    Three-dimensional equations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/103/1/012045/pdf
DOI  :  10.1088/1757-899X/103/1/012045

来源: IOP

【 摘 要 】

Bulk piezoelectric ceramics operating in thickness-stretch (TSt) modes have been widely used in acoustic-related devices. However, the fundamental TSt waves are always coupled with other modes, and the occurrence of these spurious modes in bulk piezoelectric ceramics affects its performance. To suppress the spurious modes, 1-3 piezoelectric composites are promising candidates. However, theoretical modeling of multiphase ceramic composite objects is very complex. In this study, a 1-3 piezoelectric composite sample and a bulk piezoelectric sample are fabricated. The electrical impedance of these two samples are compared. A simple analytical TSt vibration mode from the three dimensional equations of linear piezoelectricity is used to model the performance of 1-3 piezoelectric composites. The theoretical results agree well with the experimental results.