Electrocaloric effect in La-doped BNT-6BT relaxor ferroelectric ceramics

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dc.contributor.author Li, Lucheng
dc.contributor.author Xu, Mengxing
dc.contributor.author Zhang, Qi
dc.contributor.author Chen, Ping
dc.contributor.author Wang, Ningzhang
dc.contributor.author Xiong, Dingkang
dc.contributor.author Peng, Biaolin
dc.contributor.author Liu, Laijun
dc.date.accessioned 2017-10-17T15:41:23Z
dc.date.available 2017-10-17T15:41:23Z
dc.date.issued 2017-09-22
dc.identifier.citation Li L, Xu M, Zhang Q, et al., Electrocaloric effect in La-doped BNT-6BT relaxor ferroelectric ceramics. Ceramics International, Volume 44, Issue 1, January 2018, Pages 343-350 en_UK
dc.identifier.issn 0272-8842
dc.identifier.uri http://dx.doi.org/10.1016/j.ceramint.2017.09.179
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/12650
dc.description.abstract Relaxor [(Bi1/2Na1/2)0.94Ba0.06](1-1.5x)LaxTiO3 (x = 0, 0.03, 0.06, 0.09) ceramics (La-doped BNT-6BT) with composition close to the morphotropic phase boundary (MPB) were successfully prepared by using the conventional solid state reaction method. All samples present almost a pure perovskite phase with the coexistence of tetragonal and rhombohedral. With the increase of La doping content, the degree of the dielectric relaxor dispersion around the dielectric peak which is close to the room temperature increases, and also the transition temperature of ferroelectric-to-relaxor (TF-R) shifts 120 K towards a lower temperature at x = 0.09. The maximum value of the temperature change (ΔT) of the electrocaloric (EC) effect decreases sharply from 1.1 K at x = 0–0.064 K at x = 0.09. A large positive EC effect (maximum ΔT ~ 0.44 K) in a broad temperature range (~ 90 K) close to room temperature is achieved at x = 0.03, indicating that it is a promising lead-free material for application in solid state cooling system. Moreover, it is found that the Maxwell relationship can be well used to assess the EC effects of the La-doped BNT-6BT ceramics when the operating temperature is higher than that of the TF-R, indicating that these relaxor ceramics would perform as an ergodic. en_UK
dc.language.iso en en_UK
dc.publisher Elsevier en_UK
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject Relaxor ferroelectric en_UK
dc.subject Electrocaloric en_UK
dc.subject MPB en_UK
dc.subject Lead-free en_UK
dc.title Electrocaloric effect in La-doped BNT-6BT relaxor ferroelectric ceramics en_UK
dc.type Article en_UK

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