Nonlinear dielectric response in piezoelectric materials for underwater transducers

作者：Sherlock N P^*; Garten L M; Zhang S J; Shrout T R; Meyer R J Jr

来源：Journal of Applied Physics, 2012, 112(12): 124108.

DOI：10.1063/1.4770355

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 (d(33>) 2000 pC/N) and electromechanical coupling factor (k(33) > 0.90) with the low mechanical losses (Q(M) > 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.

• 出版日期2012-12-15