Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
Feature: Cutting edge research on electroceramics 2016: Full papers
Indirect measurements of electrocaloric effect in ferroelectric thin films by positive-up-negative-down method
Shogo MATSUOTomoaki YAMADATakafumi KAMOHiroshi FUNAKUBOMasahito YOSHINOTakanori NAGASAKI
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Volume 125 (2017) Issue 6 Pages 441-444

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Abstract

Positive-up-negative-down (PUND) polarization measurement was employed to indirectly estimate the electrocaloric (EC) effect in ferroelectric films. By subtracting the conductive component from the observed charge profile, the polarization values at various electric fields and temperatures were precisely determined. The estimated EC effect for an epitaxial Ba0.3Sr0.7O3 thin film fabricated on SrRuO3/SrTiO3 (001) substrate showed the largest temperature change at around the ferroelectric-paraelectric phase transition temperature, which agrees with the theoretical prediction. On the other hand, the EC effect estimated by the conventional hysteresis loop measurement showed different peaking temperature from the theoretical prediction. The deviation became larger with lowering the measurement frequency. The observed results indicate the importance of precise evaluation of polarization for the examined temperature-electric field space.

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© 2017 The Ceramic Society of Japan
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