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Issue 5, 2019

Phase-transition induced giant negative electrocaloric effect in a lead-free relaxor ferroelectric thin film

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Abstract

Ferroelectric/antiferroelectric thin/thick films with large positive or negative electrocaloric (EC) effects could be very useful in designing commercial refrigeration devices. Here, a giant negative EC effect (maximum ΔT ∼ −42.5 K with ΔS ∼ −29.3 J K−1 kg−1) comparable to the best positive EC effects reported so far is demonstrated for 0.5(Ba0.8Ca0.2)TiO3–0.5Bi(Mg0.5Ti0.5)O3 (BCT–BMT) lead-free relaxor ferroelectric thin films prepared on Pt(111)/TiOx/SiO2/Si substrates using a sol–gel method. An electric-field induced structural phase transition (nanoscale tetragonal and orthorhombic to rhombohedral) along the out-of-plane [111] direction plays a very key role in developing the giant negative EC effect. This breakthrough will pave the way for practical applications of next-generation refrigeration devices with high cooling efficiency in one cycle by ingeniously utilizing and combining both the giant negative and positive EC effects. Moreover, a large energy density of 51.7 J cm−3 with a high power density of 1.15 × 1010 W kg−1 at room temperature is also achieved in the thin film, indicating that it is also an attractive multifunctional material for energy storage.

Graphical abstract: Phase-transition induced giant negative electrocaloric effect in a lead-free relaxor ferroelectric thin film

Supplementary files

Article information


Submitted
24 Jan 2019
Accepted
18 Apr 2019
First published
02 May 2019

Energy Environ. Sci., 2019,12, 1708-1717
Article type
Paper

Phase-transition induced giant negative electrocaloric effect in a lead-free relaxor ferroelectric thin film

B. Peng, Q. Zhang, B. Gang, G. J. T. Leighton, C. Shaw, S. J. Milne, B. Zou, W. Sun, H. Huang and Z. Wang, Energy Environ. Sci., 2019, 12, 1708 DOI: 10.1039/C9EE00269C

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