Measuring the dynamic electromechanical response of ferroelectrics

Abstract eng:
To better understand the dynamic response of thermo-electro-mechanically coupled materials, in particular stiffness and mechanical damping, an experimental method called Broadband Electromechanical Spectroscopy (BES) was developed. The motivation for BES was to study ferroelectric materials over wide ranges of frequencies of simultaneously applied electric fields and mechanical stresses under temperature control. By precisely controlling electric fields and mechanical loading, the effect of microstructural changes, in particular domain switching in ferroelectrics, on the dynamic mechanical response is measured. Experiments show large increases in mechanical damping during domain switching that can be tuned by appropriate electrical loading. Results obtained using the new capabilities brought by BES can be used to better understand the damping associated with domain wall motion to be able to create ceramic materials with both high stiffness and high damping – an elusive combination of properties in typical engineering materials.

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