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Theoretical prediction of electrocaloric effect based on non-linear behaviors of dielectric permittivity under temperature and electric fields
8.S.G. Lu, B. Rožič, Q.M. Zhang, Z. Kutnjak, X. Li, E. Furman, L.J. Gorny, M. Lin, B. Malič, M. Kosec, R. Blinc, and R. Pirc, Appl. Phys. Lett. 97, 162904 (2010).
11.U. Plaznik, A. Kitanovski, B. Rožič, B. Malič, H. Uršič, S. Drnovšek, J. Cilenšek, M. Vrabelj, A. Poredoš, and Z. Kutnjak, Appl. Phys. Lett. 106, 043903 (2015).
27.Y.L. Wang, A.K. Tagantsev, D. Damjanovic, N. Setter, V.K. Yarmarkin, A.I. Sokolov, and I.A. Lukyanchuk, J. Appl. Phys. 101, 104115 (2007).
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The electrocaloric (EC) effect has been paid great attentions recently for applications on cooling or electricity generation. However, the directly commercial measurement equipment for the effect is still unavailable. Here we report a novel method to predict EC effect by non-linear behaviors of dielectricpermittivity under temperature and electric fields. According to the method, the analytical equations of EC temperature change ΔT are directly given for normal ferroelectrics and relaxor. The calculations have been performed on several materials and it is shown that the method is suitable for both inorganic and organic ferroelectrics, and relaxor.
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