Ma, Yang-Bin ; Novak, Nikola ; Albe, Karsten ; Xu, Bai-Xiang (2016)
Optimized electrocaloric effect by field reversal: Analytical model.
In: Applied Physics Letters, 109 (202906)
doi: 10.1063/1.4968006
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Applying a negative field on a positively poled ferroelectric sample can enhance the electrocaloric cooling and is a promising method to optimize the electrocaloric cycle. Experimental measurements show that the maximal cooling is not obtained, when the electric field is removed, but reversed to a value corresponding to the shoulder of the P-E loop. This phenomenon cannot be explained if a constant total entropy is assumed under adiabatic conditions. Thus, a direct analysis of entropy changes based on work loss is proposed in this work, which takes the entropy contribution of the irreversible process into account. The optimal reversed field determined by this approach agrees with the experimental observations. This study signifies the importance of considering irreversible process in the electrocaloric cycles.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Ma, Yang-Bin ; Novak, Nikola ; Albe, Karsten ; Xu, Bai-Xiang |
| Art des Eintrags: | Bibliographie |
| Titel: | Optimized electrocaloric effect by field reversal: Analytical model |
| Sprache: | Englisch |
| Publikationsjahr: | 17 November 2016 |
| Verlag: | American Institute of Physics Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Applied Physics Letters |
| Jahrgang/Volume einer Zeitschrift: | 109 |
| (Heft-)Nummer: | 202906 |
| DOI: | 10.1063/1.4968006 |
| Kurzbeschreibung (Abstract): | Applying a negative field on a positively poled ferroelectric sample can enhance the electrocaloric cooling and is a promising method to optimize the electrocaloric cycle. Experimental measurements show that the maximal cooling is not obtained, when the electric field is removed, but reversed to a value corresponding to the shoulder of the P-E loop. This phenomenon cannot be explained if a constant total entropy is assumed under adiabatic conditions. Thus, a direct analysis of entropy changes based on work loss is proposed in this work, which takes the entropy contribution of the irreversible process into account. The optimal reversed field determined by this approach agrees with the experimental observations. This study signifies the importance of considering irreversible process in the electrocaloric cycles. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Mechanik Funktionaler Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe |
| Hinterlegungsdatum: | 18 Nov 2016 06:27 |
| Letzte Änderung: | 26 Jan 2024 09:21 |
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