Waske, Anja ; Giebeler, Lars ; Weise, Bruno ; Funk, Alexander ; Hinterstein, Manuel ; Herklotz, Markus ; Skokov, Konstantin ; Fähler, Sebastian ; Gutfleisch, Oliver ; Eckert, Jürgen (2015):
Asymmetric first-order transition and interlocked particle state in magnetocaloric La(Fe,Si)13.
In: physica status solidi (RRL) - Rapid Research Letters, WILEY-VCH Verlag GmbH & Co. KGaA, ISSN 18626254,
[Article]
Abstract
In-situ synchrotron XRD measurements of the magnetocaloric material LaFe11.8Si1.2 are used to understand virgin effects and asymmetry of the underlying first order magnetovolume transition. A remarkable change of the transition kinetics occurs after the first cycle, which we attribute to the formation of cracks originating from the volume change. Tomographic imaging revealed that the bulk material disintegrates via an interlocked state where fragments are loosely connected. Though cracks have opened between the fragments, the transition is sharp, which we attribute to magnetostatic interactions. In the cycled sample we find a strong asymmetry between the transition interval upon heating and cooling, which we explain by isostatic pressure acting on parts of the sample during the cooling transition.
| Item Type: | Article |
|---|---|
| Erschienen: | 2015 |
| Creators: | Waske, Anja ; Giebeler, Lars ; Weise, Bruno ; Funk, Alexander ; Hinterstein, Manuel ; Herklotz, Markus ; Skokov, Konstantin ; Fähler, Sebastian ; Gutfleisch, Oliver ; Eckert, Jürgen |
| Title: | Asymmetric first-order transition and interlocked particle state in magnetocaloric La(Fe,Si)13 |
| Language: | English |
| Abstract: | In-situ synchrotron XRD measurements of the magnetocaloric material LaFe11.8Si1.2 are used to understand virgin effects and asymmetry of the underlying first order magnetovolume transition. A remarkable change of the transition kinetics occurs after the first cycle, which we attribute to the formation of cracks originating from the volume change. Tomographic imaging revealed that the bulk material disintegrates via an interlocked state where fragments are loosely connected. Though cracks have opened between the fragments, the transition is sharp, which we attribute to magnetostatic interactions. In the cycled sample we find a strong asymmetry between the transition interval upon heating and cooling, which we explain by isostatic pressure acting on parts of the sample during the cooling transition. |
| Journal or Publication Title: | physica status solidi (RRL) - Rapid Research Letters |
| Publisher: | WILEY-VCH Verlag GmbH & Co. KGaA |
| Uncontrolled Keywords: | magnetic refrigeration, magnetocaloric materials, phase transitions, La(Fe,Si)13, X-ray diffraction |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Functional Materials 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 10 Feb 2015 09:49 |
| URL / URN: | http://dx.doi.org/10.1002/pssr.201409484 |
| Identification Number: | doi:10.1002/pssr.201409484 |
| Funders: | A. Waske, B. Weise, S. Fähler and O. Gutfleisch gratefully acknowledge funding by DFG (SPP 1599, www.Ferroic-Cooling.de, WA 3294/1-1, FA 453/11-1, GU 514/3-1)., K. P. Skokov is grateful to the European Community’s 7th Framework Program under the grant agreement No. 310748 (DRREAM). |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Send an inquiry |
Options (only for editors)
 |
Show editorial Details |
Drucken
Impressum