Reduction of the electrocaloric entropy change of ferroelectric PbZr1-xTix O3 epitaxial layers due to an elastocaloric effect

Trong Tong, J. Karthik, R. V.K. Mangalam, Lane W. Martin, David G. Cahill

Research output: Contribution to journalArticlepeer-review

Abstract

We report laser-based direct measurements of the pyroelectric and electrocaloric effects of PbZr1-xTixO3 epitaxial layers as a function of temperature and electric field. By evaluating the differences between the total pyroelectric and electrocaloric coefficients, we determine the secondary contribution to the electrocaloric effect that is created by a combination of piezoelectric and elastocaloric effects. The secondary contribution to the electrocaloric coefficient has the opposite sign as the primary effect and therefore reduces the overall entropy change of PbZr1-xTixO3 in an electric field. The absolute magnitude of the secondary effect is comparable to the primary effect at elevated temperatures of ≈200°C.

Original languageEnglish (US)
Article number094116
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number9
DOIs
StatePublished - Sep 26 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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