| Autor: |
Kacem H; Université de Monastir, Faculté des Sciences de Monastir, Laboratoire de la Matière Condensée et des Nanosciences LR11ES40 5000 Monastir Tunisia kacem.hend@gmail.com +216-92188163., Dhahri A; Université de Sfax, Faculté des Sciences de Sfax, Laboratoire de Physique Appliqué B. P. 1171 3000 Sfax Tunisia.; Université de Shaqra, Faculté des Sciences et des Sciences Humaines de Ad-Dawadmi, Department Physique 11911 Shaqra Saudi Arabia., Aouaini F; Department of Physics, College of Science, Princess Nourah bint Abdulrahman University P.O. Box 84428 Riyadh 11671 Saudi Arabia., Sassi Z; Université de Lyon, INSA-LYON, LGEF, EA682 F-69621 Villeurbanne France., Seveyrat L; Université de Lyon, INSA-LYON, LGEF, EA682 F-69621 Villeurbanne France., Lebrun L; Université de Lyon, INSA-LYON, LGEF, EA682 F-69621 Villeurbanne France., Dhahri J; Université de Monastir, Faculté des Sciences de Monastir, Laboratoire de la Matière Condensée et des Nanosciences LR11ES40 5000 Monastir Tunisia kacem.hend@gmail.com +216-92188163. |
| Jazyk: |
angličtina |
| Zdroj: |
RSC advances [RSC Adv] 2022 Oct 27; Vol. 12 (47), pp. 30771-30784. Date of Electronic Publication: 2022 Oct 27 (Print Publication: 2022). |
| DOI: |
10.1039/d2ra04914g |
| Abstrakt: |
A BaTi 0.91 Sn 0.08 Zr 0.01 O 3 (BTSZ) ceramic was prepared by a conventional solid-state reaction method. Its structural, dielectric, ferroelectric, and pyroelectric properties were carefully studied. The Rietveld refinement was used to characterize the structural proprieties of the synthesized ceramic. The microstructure was observed by scanning electron microscopy. Phase transitions observed in the temperature dependent dielectric permittivity ( ε r - T and tan δ - T ) showed a transition close to room temperature, resulting in improved piezoelectric, pyroelectric and electrocaloric performance. In addition, it was found that an electric field poling process changed the character of ε r - T and tan δ - T plots. Resonance modes in the polarized state, where maximum power transmission was achieved, were observed in the impedance spectrum. The extra-slim hysteresis loops revealed a relatively low coercive field and hysteresis loss related to the diffuse phase transition, which can significantly improve energy storage efficiency up to 75% at 100 °C. To characterize the electrocaloric effect (ECE), indirect and direct methods based on the thermodynamic approach were used. Both methods results showed good consistency and revealed a large ECE peak evolving along the phase diagram. Furthermore, pyroelectric figures of merit (FOMs) for voltage responsivity ( F v ), current responsivity ( F i ), energy harvesting ( F E ), new energy harvesting and detectivity ( F d ) were calculated. Finally, thermal energy harvesting ( N D ) was determined by using the Olsen cycle. The obtained maximum N D was 233.7 kJ m -3 when the Olsen cycle operated at 25-100 °C and 0-30 kV cm -1 . This study introduces not only a technique to produce a high performance ceramic for refrigeration devices, but also broadens the range of applications for BT-based lead-free ferroelectrics beyond actuators, sensors, and energy harvesting to solid-state cooling.
Competing Interests: All authors have declared no conflicts of interest.
(This journal is © The Royal Society of Chemistry.) |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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