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Large entropy change, adiabatic temperature change, and small hysteresis in La(Fe,Mn)11.6Si1.4 strip-cast flakes

Zhang, M. X. and Liu, J. and Zhang, Y. and Dong, J. D. and Yan, A. R. and Skokov, K. P. and Gutfleisch, O. (2015):
Large entropy change, adiabatic temperature change, and small hysteresis in La(Fe,Mn)11.6Si1.4 strip-cast flakes.
In: Journal of Magnetism and Magnetic Materials, Elsevier Science Publishing, pp. 90-94, 377, ISSN 03048853,
[Online-Edition: http://dx.doi.org/10.1016/j.jmmm.2014.10.035],
[Article]

Abstract

We report on the microstructure, phase constitution and magnetocaloric properties in rapidly solidified La(Fe,Mn)11.6Si1.4 flakes prepared by strip casting technique. After a relatively short-time annealing at 1323 K for 12 h, LaFe11.6Si1.4 flakes constituting a nearly single NaZn13-structured La(Fe,Si)13, i.e. 1:13 phase, exhibit a large entropy change of 19.2 J/kg K and adiabatic temperature change of 6.5 K when the application of a magnetic field of 2 T at which temperature. These features are comparable to those observed in the bulk samples. More importantly, the thermal and magnetic hysteresis of the present flakes is significantly smaller than that in the bulk alloys. The Curie temperature can be accurately tuned through replacing Fe by Mn. Thus, La–Fe–Si-based strip-cast flakes are promising for magnetic refrigerants in mass production.

Item Type: Article
Erschienen: 2015
Creators: Zhang, M. X. and Liu, J. and Zhang, Y. and Dong, J. D. and Yan, A. R. and Skokov, K. P. and Gutfleisch, O.
Title: Large entropy change, adiabatic temperature change, and small hysteresis in La(Fe,Mn)11.6Si1.4 strip-cast flakes
Language: English
Abstract:

We report on the microstructure, phase constitution and magnetocaloric properties in rapidly solidified La(Fe,Mn)11.6Si1.4 flakes prepared by strip casting technique. After a relatively short-time annealing at 1323 K for 12 h, LaFe11.6Si1.4 flakes constituting a nearly single NaZn13-structured La(Fe,Si)13, i.e. 1:13 phase, exhibit a large entropy change of 19.2 J/kg K and adiabatic temperature change of 6.5 K when the application of a magnetic field of 2 T at which temperature. These features are comparable to those observed in the bulk samples. More importantly, the thermal and magnetic hysteresis of the present flakes is significantly smaller than that in the bulk alloys. The Curie temperature can be accurately tuned through replacing Fe by Mn. Thus, La–Fe–Si-based strip-cast flakes are promising for magnetic refrigerants in mass production.

Journal or Publication Title: Journal of Magnetism and Magnetic Materials
Volume: 377
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: La–Fe–Si alloy, Strip casting technique, Magnetocaloric effect
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: 17 Nov 2014 10:10
Official URL: http://dx.doi.org/10.1016/j.jmmm.2014.10.035
Identification Number: doi:10.1016/j.jmmm.2014.10.035
Funders: This work was supported by the National Natural Science Foundation of China (Grant no. 51371184), Zhejiang Provincial Natural Science Foundation of China (Grant no. LR14E010001), China Postdoctoral Science Foundation (Grant no. 2013M541553)., This work was supported by the DFG (SPP 1599).
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