Giant adiabatic temperature change in FeRh alloys evidenced by direct measurements under cyclic conditions / Chirkova A.,Skokov K. P.,Schultz L.,Baranov N. V.,Gutfleisch O.,Woodcock T. G. // ACTA MATERIALIA. - 2016. - V. 106, l. . - P. 15-21.

ISSN/EISSN:

1359-6454 / 1873-2453

Type:

Article

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.

Author keywords:

FeRh; Magnetocaloric effect; First-order transitions; Magnetic refrigeration ROOM-TEMPERATURE; ENTROPY CHANGE; HEAT-CAPACITY; TRANSITIONS; SYSTEM

DOI:

10.1016/j.actamat.2015.11.054

Web of Science ID:

ISI:000371650300002

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	MAR
Publisher	PERGAMON-ELSEVIER SCIENCE LTD
Address	THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Language	English
EISSN	1873-2453
Keywords-Plus	ROOM-TEMPERATURE; ENTROPY CHANGE; HEAT-CAPACITY; TRANSITIONS; SYSTEM
Research-Areas	Materials Science; Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Materials Science, Multidisciplinary; Metallurgy \& Metallurgical Engineering
Author-Email	a.chirkova@ifw-dresden.de
ResearcherID-Numbers	Skokov, Konstantin/C-2992-2008 Gutfleisch, Oliver/C-7241-2011 Baranov, Nikolai/J-5042-2013 Chirkova, Alisa/K-8417-2013
ORCID-Numbers	Skokov, Konstantin/0000-0003-4321-9021 Gutfleisch, Oliver/0000-0001-8021-3839 Baranov, Nikolai/0000-0002-9720-5314 Chirkova, Alisa/0000-0001-5455-4197
Funding-Acknowledgement	Ural Branch of RAS {[}15-17-2-22]; Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST `MISiS' {[}K3-2015-029]
Funding-Text	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).
Number-of-Cited-References	27
Usage-Count-Last-180-days	5
Usage-Count-Since-2013	57
Journal-ISO	Acta Mater.
Doc-Delivery-Number	DF8ZP