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Magnetic and Magnetocaloric Properties of LaFe _{13-{\rm x}} (Si _{1-{\rm w}} Al _{\rm w} ) _{\rm x} Alloys and Their Hydrides

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6 Author(s)
Barcza, A. ; Vacuumschmelze GmbH & Co. KG, Hanau, Germany ; Zellmann, V. ; Zapf, M. ; Elwert, T.
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The influence of aluminum on the magnetic and magnetocaloric properties of LaFe13-xSix alloys is investigated. For this purpose the magnetic phase diagrams of three quasi-ternary alloy series of LaFe13-x(Si1-wAlw)x with x = 1.14, 1.43, and 1.71 are presented. Samples with high iron-content (x = 1.14) and high aluminum-content show antiferromagnetic (AFM) ordering which changes over to ferromagnetic (FM) ordering as the aluminum-content is decreased. For intermediate Si- and Al-contents samples show both low temperature FM ordering and higher temperature AFM ordering. As the overall iron-content is decreased ( x = 1.43, and 1.71) FM ordering dominates the phase diagram. Upon hydrogenation all samples become ferromagnetic and transition temperatures are increased by about 150 K. A detailed analysis of the hydrogen content shows that aluminum-rich samples take up more hydrogen compared to the silicon-rich samples. This can be linked to larger interstitial voids resulting from the lattice expansion when Si is replaced with Al. The isothermal entropy change of aluminum-substituted alloys is always lower than the one of the silicon-variants at the same iron concentration.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )

Date of Publication:

Nov. 2012

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