Enhanced electrocaloric effect in composition gradient bilayer thick films

Ying Hou, Lu Yang, Xiaoshi Qian, Tian Zhang, Q. M. Zhang

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Abstract

We report the enhanced electrocaloric (EC) response over a broad temperature range in composition gradient Ba(ZrTi)O3 based bilayer thick films. A large EC temperature change of -4.9 K under an electric field of 10 MV/m around room temperature, large electrocaloric coefficient ΔT/ΔE = 0.49 × 10-6 K m V-1 were observed in the BaZr0.17Ti0.83O3/BaZr0.20Ti0.80O3 bilayer thick films, which are improved compared with BaZr0.20Ti0.80O3 and BaZr0.17Ti0.83O3 homogeneous bilayer films. The result reveals the potential of the composition gradient bilayer structure in improving the electrocaloric effect, which may provide an effective route to achieve large EC temperature change under a low electric field.

Original languageEnglish (US)
Article number133501
JournalApplied Physics Letters
Volume108
Issue number13
DOIs
StatePublished - Mar 28 2016

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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