Liu, Jian ; Gottschall, Tino ; Skokov, Konstantin P. ; Moore, James D. ; Gutfleisch, Oliver (2012)
Giant magnetocaloric effect driven by structural transitions.
In: Nature Materials, 11 (7)
doi: 10.1038/nmat3334
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Magnetic cooling could be a radically different energy solution substituting conventional vapour compression refrigeration in the future. For the largest cooling effects of most potential refrigerants we need to fully exploit the different degrees of freedom such as magnetism and crystal structure. We report now for Heusler-type Ni–Mn–In–(Co) magnetic shape-memory alloys, the adiabatic temperature change ΔTad = −3.6 to −6.2 K under a moderate field of 2 T. Here it is the structural transition that plays the dominant role towards the net cooling effect. A phenomenological model is established that reveals the parameters essential for such a large ΔTad. We also demonstrate that obstacles to the application of Heusler alloys, namely the usually large hysteresis and limited operating temperature window, can be overcome by using the multi-response to different external stimuli and/or fine-tuning the lattice parameters, and by stacking a series of alloys with tailored magnetostructural transitions.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Liu, Jian ; Gottschall, Tino ; Skokov, Konstantin P. ; Moore, James D. ; Gutfleisch, Oliver |
| Art des Eintrags: | Bibliographie |
| Titel: | Giant magnetocaloric effect driven by structural transitions |
| Sprache: | Englisch |
| Publikationsjahr: | 2012 |
| Verlag: | Nature Publishing Group |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Nature Materials |
| Jahrgang/Volume einer Zeitschrift: | 11 |
| (Heft-)Nummer: | 7 |
| DOI: | 10.1038/nmat3334 |
| Kurzbeschreibung (Abstract): | Magnetic cooling could be a radically different energy solution substituting conventional vapour compression refrigeration in the future. For the largest cooling effects of most potential refrigerants we need to fully exploit the different degrees of freedom such as magnetism and crystal structure. We report now for Heusler-type Ni–Mn–In–(Co) magnetic shape-memory alloys, the adiabatic temperature change ΔTad = −3.6 to −6.2 K under a moderate field of 2 T. Here it is the structural transition that plays the dominant role towards the net cooling effect. A phenomenological model is established that reveals the parameters essential for such a large ΔTad. We also demonstrate that obstacles to the application of Heusler alloys, namely the usually large hysteresis and limited operating temperature window, can be overcome by using the multi-response to different external stimuli and/or fine-tuning the lattice parameters, and by stacking a series of alloys with tailored magnetostructural transitions. |
| Freie Schlagworte: | Magnetic materials, Nanoscale materials |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 22 Apr 2013 08:33 |
| Letzte Änderung: | 22 Apr 2013 08:33 |
| PPN: | |
| Sponsoren: | The research leading to these results has received financial support from Deutsche Forschungsgemeinschaft (SPP 1239) and the European Community’s 7th Framework Programme under grant agreement No. 214864 (SSEEC). |
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