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

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...

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Bibliographic Details
Published in:Journal of applied physics 2017-02, Vol.121 (6)
Main Authors: Asbani, B., Gagou, Y., Dellis, J.-L., Trček, M., Kutnjak, Z., Amjoud, M., Lahmar, A., Mezzane, D., El Marssi, M.
Format: Article
Language:English
Subjects:
Applied physics
Ceramics
Condensed Matter
Curie temperature
Ferroelectric materials
Ferroelectricity
Lead free
Phase transitions
Physics
Tellurium
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Summary: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 ΔT = 1.237 K determined by the direct method was obtained at the relatively moderate field of ∼25 kV/cm in Ba0.8Ca0.2Ti(1−x)TexO3 with x = 0.02. The corresponding electrocaloric responsivity ΔT/ΔE = 0.495 × 10−6 K m V−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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4975407