Ma, Yangbin ; Xu, Bai-Xiang ; Albe, Karsten ; Grünebohm, Anna (2018)
Tailoring the electrocaloric effect by internal bias fields and field protocols.
In: Physical Review Applied, 10 (2)
doi: 10.1103/PhysRevApplied.10.024048
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Defect dipoles, strain gradients, and the electric boundary conditions at interfaces and surfaces often impose internal bias fields in acceptor-doped ferroelectrics, ferroelectric films, nanocomposites, and multilayers. In this work, we study the impact of internal bias fields on the electrocaloric effect (ECE), utilizing an analytical model and ab-initio-based molecular-dynamics simulations. We reveal the complex dependency of the ECE on field protocol and the relative strength of internal and external fields. The internal fields may even reverse the sign of the response (inverse or negative ECE). We explore the transition between conventional and inverse ECE and discuss reversible and irreversible contributions to the field-induced specific entropy change. Most importantly, we predict design routes to optimize the cooling and heating response for small external fields by the combination of internal field strengths and the field-loading protocol.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Ma, Yangbin ; Xu, Bai-Xiang ; Albe, Karsten ; Grünebohm, Anna |
| Art des Eintrags: | Bibliographie |
| Titel: | Tailoring the electrocaloric effect by internal bias fields and field protocols |
| Sprache: | Englisch |
| Publikationsjahr: | 26 August 2018 |
| Verlag: | AMER PHYSICAL SOC |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review Applied |
| Jahrgang/Volume einer Zeitschrift: | 10 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.1103/PhysRevApplied.10.024048 |
| Kurzbeschreibung (Abstract): | Defect dipoles, strain gradients, and the electric boundary conditions at interfaces and surfaces often impose internal bias fields in acceptor-doped ferroelectrics, ferroelectric films, nanocomposites, and multilayers. In this work, we study the impact of internal bias fields on the electrocaloric effect (ECE), utilizing an analytical model and ab-initio-based molecular-dynamics simulations. We reveal the complex dependency of the ECE on field protocol and the relative strength of internal and external fields. The internal fields may even reverse the sign of the response (inverse or negative ECE). We explore the transition between conventional and inverse ECE and discuss reversible and irreversible contributions to the field-induced specific entropy change. Most importantly, we predict design routes to optimize the cooling and heating response for small external fields by the combination of internal field strengths and the field-loading protocol. |
| 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 Materialmodellierung |
| Hinterlegungsdatum: | 26 Nov 2018 06:10 |
| Letzte Änderung: | 26 Jan 2024 09:21 |
| PPN: | |
| Sponsoren: | Funding from the Deutsche Forschungsgemeinschaft (DFG) SPP 1599 B3 (Grants No. XU 121/1-2 and No. AL 578/16-2) and A11/B2 (Grant No. GR 4792/1-2) is acknowledged., Additionally, we are grateful to the Lichtenberg-High Performance Computer at TU Darmstadt and the Center for Computational Science and Simulation (CCSS) at University of Duisburg-Essen for the use of their computational resources. |
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