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Lead free Ba0.8Ca0.2TexTi1-xO3 ferroelectric ceramics exhibiting high electrocaloric properties

Abstract : Direct and indirect electrocaloric measurements were performed on the new Tellurium (Te) doped Ba0.8Ca0.2TiO3 (BCT) ceramics. The effects of Te addition on structural, electrical, and electrocaloric properties of BCT ceramics were investigated. The incorporation of the Te element in the BCT induced the decrease of the Curie temperature and the enhancement of the electrocaloric effect. The significant electrocaloric temperature change Delta T - 1.237K determined by the direct method was obtained at the relatively moderate field of similar to 25 kV/cm in Ba0.8Ca0.2Ti(1-x)TexO3 with x - 0.02. The corresponding electrocaloric responsivity Delta T/Delta E = 0.495 x 10(-6) KmV(-1) is higher than that observed in pure BCT ceramics and is one of the highest reported so far in lead-free ferroelectric materials. The material's coefficient of performance was determined at the phase transition with a maximal value of 14.7. Published by AIP Publishing.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03627582
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Soumis le : vendredi 1 avril 2022 - 13:47:31
Dernière modification le : mardi 27 septembre 2022 - 04:17:41

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B. Asbani, Y. Gagou, Jean-Luc Dellis, M. Trcek, Z. Kutnjak, et al.. Lead free Ba0.8Ca0.2TexTi1-xO3 ferroelectric ceramics exhibiting high electrocaloric properties. Journal of Applied Physics, American Institute of Physics, 2017, 121 (6), ⟨10.1063/1.4975407⟩. ⟨hal-03627582⟩

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