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Structural and Magnetocaloric Properties of Ball Milled LaFe13−xSix(H,C)y

Published online by Cambridge University Press:  15 May 2017

L. Bessais ,
M. Phejar  and
V. Paul-Boncour
L. Bessais*
Affiliation:
Université Paris-Est, ICMPE (UMR7182), CNRS-UPEC, 2-8 rue Henri Dunant F-94320 Thiais, France
M. Phejar
Affiliation:
Université Paris-Est, ICMPE (UMR7182), CNRS-UPEC, 2-8 rue Henri Dunant F-94320 Thiais, France
V. Paul-Boncour
Affiliation:
Université Paris-Est, ICMPE (UMR7182), CNRS-UPEC, 2-8 rue Henri Dunant F-94320 Thiais, France
*
*(Email: [email protected])
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Abstract

LaFe13−xSix compounds display a giant magnetocaloric effect near 200 K. The insertion of light elements (H, C) is used to improve the Curie temperature near ambient temperature for magnetic refrigeration applications. We have developed a synthesis method with a short annealing treatment compared to classical melting techniques. The parent intermetallic alloys were synthesized by high energy ball milling. The insertion of H atoms was carried out using a Sievert apparatus and the carbon atom was inserted by solid/solid reaction. Moreover, structural and magnetic results were carried out by neutron diffraction and Mössbauer spectrometry for H content (y = 0.7,1.5) and C content (y = 0.7). The cell parameter and the Fe magnetic moments versus temperature are determined. The misunderstanding on interstitial site is clarified. The magnetovolume effect on the Curie temperature is explained by combination of the structural and magnetic properties. The advantages and drawbacks of each type of element insertion are discussed.

Keywords

compoundferromagneticmagnetic properties
Type
Articles
Information
MRS Advances , Volume 2 , Issue 56: Energy Storage and Conversion , 2017 , pp. 3447 - 3452
Copyright
Copyright © Materials Research Society 2017 

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References

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