Baumfeld, Oliver L. ; Gercsi, Zsolt ; Krautz, Maria ; Gutfleisch, Oliver ; Sandeman, Karl G. (2014)
The dynamics of spontaneous hydrogen segregation in LaFe13−xSixHy.
In: Journal of Applied Physics, 115 (20)
doi: 10.1063/1.4879099
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
By means of time-and temperature-dependent magnetization measurements, we demonstrate that the timescale of hydrogen diffusion in partially hydrogenated LaFe13-xSixHy is of the order of hours, when the material is held at temperatures close to its as-prepared Curie temperature, T-C0. The diffusion constant is estimated to be D approximate to 10(-15)-10(-16) m(2) s(-1) at room temperature. We examine the evolution of a magnetically phase-separated state upon annealing for 3 days at a range of temperatures around T-C0 and show that the thermodynamic driving force behind hydrogen diffusion and phase segregation may be attributed to the lower free energy of hydrogen interstitials in the ferromagnetic state relative to the paramagnetic state.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Baumfeld, Oliver L. ; Gercsi, Zsolt ; Krautz, Maria ; Gutfleisch, Oliver ; Sandeman, Karl G. |
| Art des Eintrags: | Bibliographie |
| Titel: | The dynamics of spontaneous hydrogen segregation in LaFe13−xSixHy |
| Sprache: | Englisch |
| Publikationsjahr: | 28 Mai 2014 |
| Verlag: | AIP Publishing LLC |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Applied Physics |
| Jahrgang/Volume einer Zeitschrift: | 115 |
| (Heft-)Nummer: | 20 |
| DOI: | 10.1063/1.4879099 |
| Kurzbeschreibung (Abstract): | By means of time-and temperature-dependent magnetization measurements, we demonstrate that the timescale of hydrogen diffusion in partially hydrogenated LaFe13-xSixHy is of the order of hours, when the material is held at temperatures close to its as-prepared Curie temperature, T-C0. The diffusion constant is estimated to be D approximate to 10(-15)-10(-16) m(2) s(-1) at room temperature. We examine the evolution of a magnetically phase-separated state upon annealing for 3 days at a range of temperatures around T-C0 and show that the thermodynamic driving force behind hydrogen diffusion and phase segregation may be attributed to the lower free energy of hydrogen interstitials in the ferromagnetic state relative to the paramagnetic state. |
| Freie Schlagworte: | MAGNETIC ENTROPY CHANGE, ELECTRON METAMAGNETIC TRANSITION, COMPOUND, MAGNETOSTRICTION, LA(FE, MN |
| 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: | 17 Nov 2014 09:17 |
| Letzte Änderung: | 17 Nov 2014 09:17 |
| PPN: | |
| Sponsoren: | The research leading to these results has received funding from the European Community's 7th Framework Programme under Grant Agreement No. 310748 “DRREAM.” , Financial support was acknowledged from The Royal Society (K.G.S.), EPSRC Grant No. EP/G060940/1 (K.G.S. and Z.G.), and an EPSRC DTG studentship is acknowledged by O.L.B. |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum