Preprint Article Version 1 This version is not peer-reviewed

Elastic and Dielectric Evaluation of the Piezoelectric Response of Ferroelectrics Using Unpoled Ceramics

Version 1 : Received: 3 September 2018 / Approved: 3 September 2018 / Online: 3 September 2018 (14:57:45 CEST)
Version 2 : Received: 17 September 2018 / Approved: 18 September 2018 / Online: 18 September 2018 (10:33:44 CEST)

A peer-reviewed article of this Preprint also exists.

Cordero, F. Elastic and Dielectric Evaluation of the Piezoelectric Response of Ferroelectrics Using Unpoled Ceramics. Ceramics 2018, 1, 211-228. Cordero, F. Elastic and Dielectric Evaluation of the Piezoelectric Response of Ferroelectrics Using Unpoled Ceramics. Ceramics 2018, 1, 211-228.

Journal reference: Ceramics 2018, 1, 18
DOI: 10.3390/ceramics1020018

Abstract

The evaluation of the piezoelectric properties of ferroelectric ceramics generally has a high level of uncertainty, due to incomplete poling, porosity, domain wall clamping and other effects. In addition, the poling process is often difficult and dangerous, due to the risk of breaking or damaging the sample. A method is described for the evaluation of the potential intrinsic piezoelectric response that a ceramic would have after full poling, without poling it. The method relies on the fact that any material undergoes an elastic softening below the ferroelectric transition temperature, whose magnitude can be expressed in terms of the intrinsic piezoelectric and dielectric coefficients of the material. Such a softening is equivalent to an electromechanical coupling, averaged over all the components due to the unpoled state of the sample, and can be deduced from a single temperature scan of an elastic modulus of a ceramic sample, spanning the ferroelectric and paraelectric states. The strengths, limits and possible applications of the method are discussed.

Subject Areas

piezoelectricity; unpoled ceramics; elastic moduli; ferroelectricity; electromechanical coupling factor

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