University of Oulu

Journal of Applied Physics 114, 174105 (2013); doi: 10.1063/1.4829012

Electrocaloric properties in relaxor ferroelectric (1−x)Pb(Mg₁/₃Nb₂/₃)O₃–xPbTiO₃ system

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Author: Peräntie, J.1; Tailor, H. N.2; Hagberg, J.1;
Organizations: 1Microelectronics and Materials Physics Laboratories, University of Oulu, P.O. Box 4500, 90014 Oulu, Finland
2Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.2 MB)
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Language: English
Published: American Institute of Physics, 2013
Publish Date: 2017-08-16


The electrocaloric effect (ECE) in the Pb(Mg₁/₃Nb₂/₃)O₃–PbTiO₃ (PMN-PT) solid solution system was investigated by means of detailed direct temperature measurements as a function of temperature, composition, and electric field. The (1−𝑥)PMN-𝑥PT ceramics of compositions 0 ≤ 𝑥 ≤ 0.3 were fabricated by the columbite route. In opposite to conventional ferroelectrics, the maximum of electrocaloric effect was found to shift from the proximity of depolarization/Curie temperature to higher temperatures above a certain composition-dependent electric field strengths. Especially, the compositions with low PT content showed a broadened temperature range of electrocaloric effect. With increasing PbTiO₃ concentration, the magnitude of Δ𝑇 increased, and the temperature dependence of the maximum ECE response gradually developed towards a more pronounced anomaly typical for conventional ferroelectrics. The arising high temperature electrocaloric effect in the ergodic relaxor phase was attributed to the contribution from polar nanoregions. All the compositions studied showed the highest electrocaloric activity just above the depolarization/Curie temperature close to the possible critical point, as recently predicted and observed for some compositions. The magnitude of the maximum electrocaloric temperature change was in the range of Δ𝑇 = 0.77–1.55 °C under an electric field strength of 50 kV/cm.

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Series: Journal of applied physics
ISSN: 0021-8979
ISSN-E: 1089-7550
ISSN-L: 0021-8979
Volume: 114
Article number: 174105
DOI: 10.1063/1.4829012
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
216 Materials engineering
Funding: The author J.P. gratefully acknowledges the Graduate School in Electronics, Telecommunications and Automation (GETA), the Nokia Foundation, the Jenny and Antti Wihuri Foundation, the Tauno T€onning Foundation, the Ulla Tuominen Foundation, the Riitta and Jorma J. Takanen Foundation, the Seppo S€ayn€aj€akangas Science Foundation, the Kaute Foundation, and the Finnish Cultural Foundation for the financial support of this work. The work at Simon Fraser University was supported by the U.S. Office of Naval Research (Grant Nos. N00014-11-1-0552 and N00014-12-1- 1045) and the Natural Science & Engineering Research Council of Canada (NSERC).
Copyright information: © 2013 AIP Publishing LLC. Published in this repository with the kind permission of the publisher.