Frequency dependent properties of high permittivity PMNT piezoelectrics for ultrasonic transducer applications

Shujun Zhanga, Hyeong Jae Lee, Thomas R. Shrout, Xiaoning Jiang, Jun Luo, Eugene R. Gerber, Nadine B. Smith

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

Pb(Zr,Ti)O3-5H piezoelectric ceramics are widely used in medical ultrasonic applications due to their high electromechanical coupling (k 33 ≤ 75%). However, their relatively low clamped dielectric permittivity (< 1500) limits their usefulness in high frequency medical transducers with small aperture and array elements. Thus, high permittivity piezoelectric materials are desired. Relaxor based Pb(Mg1/3Nb 2/3)O3-PbTiO3 (PMNT) piezoelectrics with high permittivity and coupling have attracted much attention in medical ultrasonic applications in the form of both polycrystalline and single crystals. In this work, the electromechanical coupling of monolithic PMNT and 1-3 composites were investigated as a function of frequency. Meanwhile, fine grain size (< 1 micron) PMNT polycrystalline ceramics (dielectric permittivity >5000, coupling k33 ̃78%) were developed from the point of view of manufacturability and improved mechanical and dielectric strength. High frequency PMNT single crystal/epoxy 1-3 composites were prepared with electromechanical coupling factors in the range of 72-85%, using various fabrication methods, including dice/fill and deep reactive ion etching.

Original languageEnglish (US)
Article number4803461
Pages (from-to)265-268
Number of pages4
JournalProceedings - IEEE Ultrasonics Symposium
DOIs
StatePublished - 2008
Event2008 IEEE International Ultrasonics Symposium, IUS 2008 - Beijing, China
Duration: Nov 2 2008Nov 5 2008

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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