Skokov, K. P. ; Müller, K.-H. ; Moore, J. D. ; Liu, J. ; Karpenkov, A. Yu. ; Krautz, M. ; Gutfleisch, O. (2013)
Influence of thermal hysteresis and field cycling on the magnetocaloric effect in LaFe11.6Si1.4.
In: Journal of Alloys and Compounds, 552
doi: 10.1016/j.jallcom.2012.10.008
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The adiabatic temperature change ΔTad at a field-induced first-order transition can be different when a magnetic field H is applied the first time compared to measurements under further applications of H. This can lead to overestimation of the magnetocaloric effect (MCE) if only the first field cycle is considered. In polycrystalline LaFe11.6Si1.4, for Δμ0H = 1.93 T, field cycling reduces the achieved value of ΔTad from 7 K to about 5.8 K. A metastable entropy-temperature diagram has been constructed from experimental isofield heat capacity data, which is used to comprehensively analyze results of direct measurements of ΔTad(T)0→H and isothermal magnetization measurements. It is shown that the reduction in ΔTad by field cycling is due to the presence of two-phase states that are stabilized by thermal hysteresis. Relations between optimum operational MCE parameters of a magnetic refrigerant and the maximum available field Havl have been obtained by the approach of an idealized first-order transition.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Skokov, K. P. ; Müller, K.-H. ; Moore, J. D. ; Liu, J. ; Karpenkov, A. Yu. ; Krautz, M. ; Gutfleisch, O. |
| Art des Eintrags: | Bibliographie |
| Titel: | Influence of thermal hysteresis and field cycling on the magnetocaloric effect in LaFe11.6Si1.4 |
| Sprache: | Englisch |
| Publikationsjahr: | 5 März 2013 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Alloys and Compounds |
| Jahrgang/Volume einer Zeitschrift: | 552 |
| DOI: | 10.1016/j.jallcom.2012.10.008 |
| Kurzbeschreibung (Abstract): | The adiabatic temperature change ΔTad at a field-induced first-order transition can be different when a magnetic field H is applied the first time compared to measurements under further applications of H. This can lead to overestimation of the magnetocaloric effect (MCE) if only the first field cycle is considered. In polycrystalline LaFe11.6Si1.4, for Δμ0H = 1.93 T, field cycling reduces the achieved value of ΔTad from 7 K to about 5.8 K. A metastable entropy-temperature diagram has been constructed from experimental isofield heat capacity data, which is used to comprehensively analyze results of direct measurements of ΔTad(T)0→H and isothermal magnetization measurements. It is shown that the reduction in ΔTad by field cycling is due to the presence of two-phase states that are stabilized by thermal hysteresis. Relations between optimum operational MCE parameters of a magnetic refrigerant and the maximum available field Havl have been obtained by the approach of an idealized first-order transition. |
| Freie Schlagworte: | Magnetocaloricl, Phase transitions, Thermal analysis |
| 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: | 25 Apr 2013 09:09 |
| Letzte Änderung: | 25 Apr 2016 07:37 |
| PPN: | |
| Sponsoren: | The research leading to these results has received funding from the European Community’s 7th Framework Program under grant agreement No. 214864 (SSEEC). |
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