Relaxor Ferroelectrics for Electrostrictive Transducer

Shrout, Thomas R.; Jang, S. J.

doi:10.21236/ada248671

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“…They noted a decreasing maximum strain with increasing frequency, which was later confirmed by Shrout and Jang. 40 There are more reports on the frequency dependence of the polarization loop in classical lead-containing materials for both bulk and thin film materials. [41][42][43][44][45] For lead-free piezoelectrics, however, no systematic investigation on the effect of different driving frequencies is available in the literature yet.…”

Section: Introductionmentioning

confidence: 99%

Frequency-dependence of large-signal properties in lead-free piezoceramics

Dittmer

Aulbach

et al. 2012

Journal of Applied Physics

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Articles you may be interested in Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics J. Appl. Phys. 115, 084108 (2014) The dependence of large signal properties of (1Àx)(0.81Bi 1/2 Na 1/2 TiO 3 -0.19Bi 1/2 K 1/2 TiO 3 )-xBi(Zn 1/2 Ti 1/2 )O 3 with x ¼ 0.02, 0.03, and 0.04 on the measurement frequency was investigated for a wide range of frequencies from 0.1 Hz to 100 Hz. A significant frequency dispersion in the characteristic parameters representatively maximum and coercive values was denoted. On extension with the temperature dependent dielectric permittivity measurement, it was shown that the observed frequency dependence is primarily correlated with the dynamics of field-induced phase transition from a relaxor state to a long-range ferroelectric state. Increasing the substitutional disorder introduced by Bi(Zn 1/2 Ti 1/2 )O 3 addition was demonstrated to pronounce the frequency dependence. It was proposed that the change be due to the increase in random fields and consequent dominance of ergodicity, based on the frequency-dependent hysteresis measurements at an elevated temperature above so-called induced-ferroelectric-to-relaxor transition temperature.

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