Chirkova, A. ; Skokov, K. P. ; Schultz, L. ; Baranov, N. V. ; Gutfleisch, O. ; Woodcock, T. G. (2016)
Giant adiabatic temperature change in FeRh alloys evidenced by direct measurements under cyclic conditions.
In: Acta Materialia, 106
doi: 10.1016/j.actamat.2015.11.054
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We report on (1) direct measurements of Delta T-ad for binary Fe49Rh51 during field cycling and (2) maximum possible Delta T-ad measured under discontinuous protocol. Our results show that the Delta T-ad is 9.2 K on the first application of magnetic field of Delta mu H-0 = 1.9 T and it remains as high as 6.2 K during the cycling in alternated field of the same magnitude. In addition, the adiabatic temperature change and magnetic entropy change under the first application of magnetic field and under cyclic conditions were determined indirectly using three different approaches: (1) from magnetic measurements (M(T)(H) dependences, Maxwell relations), (2) from calorimetry (C(T)(p,H), S-T diagram) and (3) from H-T diagram. While the indirectly measured maximum possible Delta T-ad lies in the range of 10.5-12 K, the reduced value of Delta T-ad measured directly under cycling (6.2 K) is still extraordinarily high and is 15% higher than in Gd in similar magnetic field. This demonstrates the potential of materials with a first order metamagnetic transition for magnetocaloric applications despite the presence of hysteresis. (C) 2015 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Chirkova, A. ; Skokov, K. P. ; Schultz, L. ; Baranov, N. V. ; Gutfleisch, O. ; Woodcock, T. G. |
| Art des Eintrags: | Bibliographie |
| Titel: | Giant adiabatic temperature change in FeRh alloys evidenced by direct measurements under cyclic conditions |
| Sprache: | Englisch |
| Publikationsjahr: | März 2016 |
| Verlag: | PERGAMON-ELSEVIER SCIENCE LTD |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Acta Materialia |
| Jahrgang/Volume einer Zeitschrift: | 106 |
| DOI: | 10.1016/j.actamat.2015.11.054 |
| Kurzbeschreibung (Abstract): | We report on (1) direct measurements of Delta T-ad for binary Fe49Rh51 during field cycling and (2) maximum possible Delta T-ad measured under discontinuous protocol. Our results show that the Delta T-ad is 9.2 K on the first application of magnetic field of Delta mu H-0 = 1.9 T and it remains as high as 6.2 K during the cycling in alternated field of the same magnitude. In addition, the adiabatic temperature change and magnetic entropy change under the first application of magnetic field and under cyclic conditions were determined indirectly using three different approaches: (1) from magnetic measurements (M(T)(H) dependences, Maxwell relations), (2) from calorimetry (C(T)(p,H), S-T diagram) and (3) from H-T diagram. While the indirectly measured maximum possible Delta T-ad lies in the range of 10.5-12 K, the reduced value of Delta T-ad measured directly under cycling (6.2 K) is still extraordinarily high and is 15% higher than in Gd in similar magnetic field. This demonstrates the potential of materials with a first order metamagnetic transition for magnetocaloric applications despite the presence of hysteresis. (C) 2015 Published by Elsevier Ltd on behalf of Acta Materialia Inc. |
| Freie Schlagworte: | FeRh, Magnetocaloric effect, First-order transitions, Magnetic refrigeration |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien |
| Hinterlegungsdatum: | 11 Mai 2016 12:27 |
| Letzte Änderung: | 31 Jan 2019 15:14 |
| PPN: | |
| Sponsoren: | This work was partly supported by the Program of the Ural Branch of RAS (Project No 15-17-2-22)., K.S. gratefully acknowledges the financial support of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST 'MISiS' (K3-2015-029)., O.G. thanks the DFG (SPP1599). |
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