Krautz, Maria ; Moore, James D. ; Skokov, Konstantin P. ; Liu, Jian ; Teixeira, Cristiano S. ; Schäfer, Rudolf ; Schultz, Ludwig ; Gutfleisch, Oliver (2012)
Reversible solid-state hydrogen-pump driven by magnetostructural transformation in the prototype system La(Fe,Si)13Hy.
In: Journal of Applied Physics, 112 (8)
doi: 10.1063/1.4759438
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
n magnetocaloric La(Fe,Si)13 alloys, it is known that hydrogen addition shifts the magnetic transition temperature TC near room temperature. By partial hydrogen desorption, TC can be adjusted precisely towards the working temperature of a magnetic cooling device. In this work, we studied the stability of partially desorbed LaFe11.6Si1.4Hy and show that the large volume difference of ferro- and para-magnetic phases drives the system from a single phase to a stable two-phase configuration. The hydrogen concentration separates on a macroscopic scale. The phase-coexistence is visualized by Kerr Microscopy. Differential scanning calorimetry measurements show that hydrogen can be reversibly recombined and separated again. We explain the separation by the coexistence of a high-volume ferromagnetic and low-volume paramagnetic phase that can be induced either by temperature or other external stimuli. This phenomenon can be applied to material systems that show a coupling of physical and structural transitions.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Krautz, Maria ; Moore, James D. ; Skokov, Konstantin P. ; Liu, Jian ; Teixeira, Cristiano S. ; Schäfer, Rudolf ; Schultz, Ludwig ; Gutfleisch, Oliver |
| Art des Eintrags: | Bibliographie |
| Titel: | Reversible solid-state hydrogen-pump driven by magnetostructural transformation in the prototype system La(Fe,Si)13Hy |
| Sprache: | Englisch |
| Publikationsjahr: | 2012 |
| Verlag: | American Institute of Physics |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Applied Physics |
| Jahrgang/Volume einer Zeitschrift: | 112 |
| (Heft-)Nummer: | 8 |
| DOI: | 10.1063/1.4759438 |
| Kurzbeschreibung (Abstract): | n magnetocaloric La(Fe,Si)13 alloys, it is known that hydrogen addition shifts the magnetic transition temperature TC near room temperature. By partial hydrogen desorption, TC can be adjusted precisely towards the working temperature of a magnetic cooling device. In this work, we studied the stability of partially desorbed LaFe11.6Si1.4Hy and show that the large volume difference of ferro- and para-magnetic phases drives the system from a single phase to a stable two-phase configuration. The hydrogen concentration separates on a macroscopic scale. The phase-coexistence is visualized by Kerr Microscopy. Differential scanning calorimetry measurements show that hydrogen can be reversibly recombined and separated again. We explain the separation by the coexistence of a high-volume ferromagnetic and low-volume paramagnetic phase that can be induced either by temperature or other external stimuli. This phenomenon can be applied to material systems that show a coupling of physical and structural transitions. |
| Freie Schlagworte: | differential scanning calorimetry, ferromagnetic materials, ferromagnetic-paramagnetic transitions, hydrogen, iron alloys, lanthanum alloys, magnetic transition temperature, magnetocaloric effects, paramagnetic materials, silicon alloys, solid-state phase transformations |
| 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 08:55 |
| Letzte Änderung: | 25 Apr 2013 08:55 |
| PPN: | |
| Sponsoren: | The research leading to these results has received fund- ing from the European Community’s 7th Framework Programme under Grant Agreement No. 214864 (SSEEC). |
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