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Study of the Electrocaloric Effect in the Relaxor Ferroelectric Ceramic 0.75PMN-0.25PT

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Abstract

Electrocaloric (EC) cooling based on the ability of materials to change temperature by applying an electric field under adiabatic conditions is a relatively new and challenging direction in ferroelectrics research. Analytical and simulation data for the electrocaloric effect (ECE) in 0.75Pb(Mg1/3Nb2/3)O3–0.25PbTiO3 (0.75PMN–0.25PT) bulk ceramic samples are reported. The adiabatic temperature change (ΔT) due to a change of the external electric field has been calculated indirectly from the entropy change. The temperature change increases with an increase in the applied electric field and reaches a maximum of 2.1 K in 25 kV/cm electric field shift near the Curie temperature of 398 K; that is, the cooling ΔT per unit field (MV/m) is 0.896 × 10−6 m K/V. This value is significantly large for bulk ceramics and makes the compound promising for room-temperature electric cooling applications.

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Authors and Affiliations

  1. Laboratory of Ferroelectric Materials, LR, Physique Mathématiques et Applications (R13ES22), Faculty of Sciences of Sfax, University of Sfax, Road Soukra km 3.5, 3000, Sfax, Tunisia

    I. Kriaa, N. Abdelmoula, A. Maalej & H. Khemakhem

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  1. I. Kriaa
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  2. N. Abdelmoula
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  3. A. Maalej
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  4. H. Khemakhem
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Kriaa, I., Abdelmoula, N., Maalej, A. et al. Study of the Electrocaloric Effect in the Relaxor Ferroelectric Ceramic 0.75PMN-0.25PT. J. Electron. Mater. 44, 4852–4856 (2015). https://doi.org/10.1007/s11664-015-4051-7

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  • DOI: https://doi.org/10.1007/s11664-015-4051-7

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