Nonlinear dielectric response in piezoelectric materials for underwater transducers

N. P. Sherlock, L. M. Garten, S. J. Zhang, T. R. Shrout, R. J. Meyer

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

SONAR transducers based on single crystal lead magnesium niobate-lead titanate (PMNT) have demonstrated improvements over conventional lead zirconate titanate ceramics. Compositional modifications to PMNT have combined the high piezoelectric coefficient (d33 > 2000 pC/N) and electromechanical coupling factor (k33 > 0.90) with the low mechanical losses (QM > 1000) of "hard" piezoelectric ceramics. The dielectric losses of single crystal PMNT have not been investigated as extensively as the mechanical losses but may significantly affect the performance of a device when water loaded. In this work, nonlinearities in the dielectric permittivity and losses have been investigated as a function of applied electric field, measurement frequency, and temperature. It is shown that electromechanically "hard" single crystals offer greater stability of the dielectric properties while maintaining a high permittivity with respect to conventional lead zirconate titanate ceramics.

Original languageEnglish (US)
Article number124108
JournalJournal of Applied Physics
Volume112
Issue number12
DOIs
StatePublished - Dec 1 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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