Functionally Graded Piezoelectric Ceramics for Ultrasonic Transducers


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Functionally graded piezoelectric ceramics (FGM) plates are attractive due to their ability to broaden the frequency bandwidth of the ultrasonic transducers. A resistivity gradient La-doped Lead Zirconate Titanate/Al-doped Zinc Oxide (La-PZT/Al-ZnO) piezoelectric ceramics plate was developed using a powder metallurgical process. Grading of the piezoelectric modulus across the plate was experimentally confirmed by the electrical impedance analysis and its gradient distribution was characterized using the profile-technique. The distribution of Zn2+ ions in the PZT region was examined using EPMA, XRD and SEM/EDX, respectively. Analysis results show that the gradient distributions of structural and electrical properties inside the FGM plate are mainly caused by the diffusion and aggregation of Zn2+ ions in the PZT layer. The functionally graded piezoelectric ceramics plate presented here will be useful for broadening the frequency bandwidth of piezoelectric transducers.



Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong






D. R. Jin et al., "Functionally Graded Piezoelectric Ceramics for Ultrasonic Transducers", Key Engineering Materials, Vols. 336-338, pp. 2609-2612, 2007

Online since:

April 2007




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