Influence of the critical point on the electrocaloric response of relaxor ferroelectrics

Brigita Rožič, Marija Kosec, Hana Uršič, Janez Holc, Barbara Malič, Qiming Zhang, Robert Blinc, Raša Pirc, Zdravko Kutnjak

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    134 Scopus citations

    Abstract

    The electrocaloric effect (ECE), i.e., the conversion of electric energy into heat, is of great importance for application in new generation cooling or heating devices that would be friendlier to the environment. Here, utilizing direct measurements of the ECE change of the temperature T via a high resolution calorimeter, we study the ECE as a function of the magnitude of the electric-field step E in the vicinity of the critical point in several bulk relaxor ferroelectric ceramic systems. Relatively large ΔT of ∼2 to 3 K were obtained at modest fields of 90 kV/cm, even in the case of ceramic materials. The effective responsivity ΔT/E as a function of the electric field shows a characteristic peak near the critical point, which demonstrates the importance of proximity to the critical point for the enhancement of the electrocaloric effect. Experimental results are in good agreement with the theoretical calculations based on the spherical random-bond random-field model.

    Original languageEnglish (US)
    Article number064118
    JournalJournal of Applied Physics
    Volume110
    Issue number6
    DOIs
    StatePublished - Sep 15 2011

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)

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