The electrocaloric effect (ECE), i.e., the adiabatic temperature change ΔTEC, of the lead-free relaxor ferroelectric 0.85K0.5Na0.5NbO3-0.15SrTiO3 (KNN-STO) ceramics is investigated. The ECE data obtained by a direct method show the existence of a large ECE near the temperature of the dielectric permittivity maximum. Due to the high break-down electric field, a large ΔTEC exceeding 1.2 K at 300 K and 1.9 K at 340 K was observed at 159 kV/cm in a broad temperature range of 80 K. Such a high ECE response near the room temperature is comparable to that found in lead-based ceramic materials, thus making KNN-STO a strong candidate to replace lead-based materials in future electrocaloric applications.
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Research Article| May 21 2015
Large electrocaloric effect in lead-free K0.5Na0.5NbO3-SrTiO3 ceramics
J. Koruza, B. Rožič, G. Cordoyiannis, B. Malič, Z. Kutnjak; Large electrocaloric effect in lead-free K0.5Na0.5NbO3-SrTiO3 ceramics. Appl. Phys. Lett. 18 May 2015; 106 (20): 202905. https://doi.org/10.1063/1.4921744
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