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

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dc.contributor.authorPeng, Biaolin
dc.contributor.authorZhang, Qi
dc.contributor.authorGang, Bai
dc.contributor.authorLeighton, Glenn J. T.
dc.contributor.authorShaw, Christopher
dc.contributor.authorMilne, Steven J.
dc.contributor.authorZou, Bingsuo
dc.contributor.authorSun, Wenhong
dc.contributor.authorHuang, Haitao
dc.contributor.authorWang, Zhonglin
dc.date.accessioned2019-06-19T09:35:18Z
dc.date.available2019-06-19T09:35:18Z
dc.date.issued2019-05-02
dc.description.abstractFerroelectric/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.en_UK
dc.identifier.citationPeng B, Zhang Q, Gang B, et al., (2019) Phase-transition induced giant negative electrocaloric effect in a lead-free relaxor ferroelectric thin film. Energy and Environmental Science, Volume 12, Issue 5, May 2019, pp. 1708-1717en_UK
dc.identifier.cris23682745
dc.identifier.issn1754-5692
dc.identifier.urihttps://doi.org/10.1039/c9ee00269c
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/14251
dc.language.isoenen_UK
dc.publisherRoyal Society of Chemistryen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.titlePhase-transition induced giant negative electrocaloric effect in a lead-free relaxor ferroelectric thin filmen_UK
dc.typeArticleen_UK

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