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Systematic investigation of Mn substituted La(Fe,Si)13 alloys and their hydrides for room-temperature magnetocaloric application

Krautz, Maria and Skokov, Konstantin and Gottschall, Tino and Teixeira, Cristiano S. and Waske, Anja and Liu, Jian and Schultz, Ludwig and Gutfleisch, Oliver (2014):
Systematic investigation of Mn substituted La(Fe,Si)13 alloys and their hydrides for room-temperature magnetocaloric application.
In: Journal of Alloys and Compounds, Elsevier Science Publishing, pp. 27-32, 598, ISSN 09258388,
[Online-Edition: http://dx.doi.org/10.1016/j.jallcom.2014.02.015],
[Article]

Abstract

Fully hydrogenated Mn containing LaFeSi alloys provide long time stability of attractive magnetocaloric properties; issues of previously reported induced phase co-existence can be avoided. In this paper, two series LaFe11.8−xSi1.2Mnx and LaFe11.6−xSi1.4Mnx (x = 0, 0.1, 0.2, 0.3, 0.4), before and after hydrogenation are presented. In the non-hydrogenated parent samples, microstructural evolution and phase formation with increasing Mn content are studied. It is found that materials combination within the sample series can provide constant MCE over a large working temperature range. As a peculiarity, the hydrogenated compounds show a different dependence of the transition temperature as a function of Si content than the parent compounds. This behaviour is explained by comparing the amount of hydrogen incorporated in samples with different Si content. Moreover, an estimation for the maximum adiabatic temperature change and optimal magnetic field is given exemplarily for a non-hydrogenated and a hydrogenated compound.

Item Type: Article
Erschienen: 2014
Creators: Krautz, Maria and Skokov, Konstantin and Gottschall, Tino and Teixeira, Cristiano S. and Waske, Anja and Liu, Jian and Schultz, Ludwig and Gutfleisch, Oliver
Title: Systematic investigation of Mn substituted La(Fe,Si)13 alloys and their hydrides for room-temperature magnetocaloric application
Language: English
Abstract:

Fully hydrogenated Mn containing LaFeSi alloys provide long time stability of attractive magnetocaloric properties; issues of previously reported induced phase co-existence can be avoided. In this paper, two series LaFe11.8−xSi1.2Mnx and LaFe11.6−xSi1.4Mnx (x = 0, 0.1, 0.2, 0.3, 0.4), before and after hydrogenation are presented. In the non-hydrogenated parent samples, microstructural evolution and phase formation with increasing Mn content are studied. It is found that materials combination within the sample series can provide constant MCE over a large working temperature range. As a peculiarity, the hydrogenated compounds show a different dependence of the transition temperature as a function of Si content than the parent compounds. This behaviour is explained by comparing the amount of hydrogen incorporated in samples with different Si content. Moreover, an estimation for the maximum adiabatic temperature change and optimal magnetic field is given exemplarily for a non-hydrogenated and a hydrogenated compound.

Journal or Publication Title: Journal of Alloys and Compounds
Volume: 598
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Magnetocaloric, Transition metal, Interstitial alloys, Hydrogen absorption, Magnetic refrigeration
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: 31 Mar 2014 08:15
Official URL: http://dx.doi.org/10.1016/j.jallcom.2014.02.015
Identification Number: doi:10.1016/j.jallcom.2014.02.015
Funders: Funding by BMBF within the VIP Program “Neuartige magnetokalorische Maschine für Kühl – und Heizanwendungen“ is gratefully acknowledged.
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