Enhanced electrocaloric effect in lead-free organic and inorganic relaxor ferroelectric composites near room temperature

Haibibu Aziguli, Xin Chen, Yang Liu, Guang Yang, Ping Yu, Qing Wang

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Abstract

We study the electrocaloric effect in the composites composed of the ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) [P(VDF-TrFE-CFE)] terpolymer matrix and lead-free BaZr0.2Ti0.8O3 (BZT) fillers. The P(VDF-TrFE-CFE)/BZT composite with 5 vol. % BZT exhibits a high adiabatic temperature change of ΔT = 7.4 K and a large isothermal entropy change of ΔS = 30 J kg-1 K-1 under an electric field of 90 MV m-1 at room temperature. The electrocaloric response in the composites is significantly enhanced when compared to those of the constituent components, which has been attributed to the polymer-filler interfacial coupling effect. In addition, the composites display a wide operational temperature window as a result of their ferroelectric relaxor nature.

Original languageEnglish (US)
Article number193902
JournalApplied Physics Letters
Volume112
Issue number19
DOIs
StatePublished - May 7 2018

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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