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Improving Hard Magnetic and Magnetocaloric Properties of Nanocrystalline Intermetallics

Published online by Cambridge University Press:  11 April 2016

L. Bessais ,
R. Guetari ,
K. Zehani ,
J. Moscovici  and
N. Mliki
L. Bessais*
Affiliation:
CMTR, ICMPE, UMR7182, CNRS – UPEC, 2-8 rue Henri Dunant F-94320 Thiais, France
R. Guetari
Affiliation:
CMTR, ICMPE, UMR7182, CNRS – UPEC, 2-8 rue Henri Dunant F-94320 Thiais, France
K. Zehani
Affiliation:
CMTR, ICMPE, UMR7182, CNRS – UPEC, 2-8 rue Henri Dunant F-94320 Thiais, France
J. Moscovici
Affiliation:
CMTR, ICMPE, UMR7182, CNRS – UPEC, 2-8 rue Henri Dunant F-94320 Thiais, France
N. Mliki
Affiliation:
LMOP, Faculty of Science of Tunis, University of Tunis El Manar, Tunisia
*
*(Email: bessais@icmpe.cnrs.fr)
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Abstract

Structural and magnetic properties of nanocrystalline P6/mmm R(Fe,M)9C are presented. Their structure is explained with a model based on the R1–s(Fe,M)5+2s formula (s = vacancy rate) where s R atoms are statistically substituted by s transition metal pairs. The maximum coercivity is obtained for low Ga/Si content for auto-coherent diffraction domain size 30 nm. This controlled microstructure might lead to hard permanent magnet materials. Furthermore, the influence of small amount of Dy substitution on magnetocaloric properties of R-Fe systme is reported. The potential for using these low-cost iron based nanostructured RFe9 powders in magnetic refrigeration at room temperature is also discussed.

Keywords

magnetic propertiesmechanical alloyingnanostructure
Type
Articles
Information
MRS Advances , Volume 1 , Issue 34: Materials Design , 2016 , pp. 2367 - 2372
Copyright
Copyright © Materials Research Society 2016 

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References

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