Enhanced lateral electromechanical coupling in lead-titanate-rod/polymer piezoelectric composites

Wallace Arden Smith, Avner A. Shaulov, Robert Y. Ting

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations

Abstract

Although modified lead-titanate ceramics exhibit a negligible d31 piezoelectric coefficient, piezoelectric-rod/polymer-matrix composites made from them exhibit a substantial d31. A theoretical analysis shows that the composite's enhanced d31 coefficient arises from lateral stress on the polymer phase being transferred to a longitudinal stress along the ceramic rods by the Poisson effect in the polymer, thus producing a charge through the ceramic's d33. For hydrophone applications, this enhanced d31 suppresses the hydrostatic response so that the composite's hydrophone figure of merit, dhgh, is less than that of the constituent ceramic. Nevertheless, the composite's still substantial dhgh, high gh coefficient, remarkable pressure stability, low density, formability, and availability in thick sheets provide advantages for naval applications. In ultrasonic transducer applications, the composite structure provides no enhancement in electromechanical coupling, since the modified lead-titanate's k33 is nearly the same as its kt. These expectations are in good agreement with measurements on 1-3 modified lead-titanate/polymer composites made by the dice-and-fill technique.

Original languageEnglish
Pages (from-to)617-622
Number of pages6
JournalUltrasonics Symposium Proceedings
Volume2
StatePublished - 1988
Externally publishedYes
EventIEEE 1988 Ultrasonics Symposium - Proceedings - Chicago, IL, USA
Duration: 2 Oct 19885 Oct 1988

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