High-Temperature Magnetocaloric Properties of Off-Stoichiometric Fe3Al Alloys

In this study, we explored the structural, magnetic, and magnetocaloric properties of Fe 3 Al off-stoichiometric samples prepared using the vacuum arc melting technique. X-ray diffraction studies confirmed the cubic D 0 3 -type structure in these samples. M(H) curve revealed soft ferromagnetic behav...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2024-12, Vol.37 (11-12), p.1815-1820
Main Authors: Ravisankar, Naveen Kumar, Koppolu, Uma Mahendra Kumar, M, Manivel Raja, Rajasabai, Senthur Pandi
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Magnetic Materials
Magnetism
Physics
Physics and Astronomy
Strongly Correlated Systems
Superconductivity
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Summary:In this study, we explored the structural, magnetic, and magnetocaloric properties of Fe 3 Al off-stoichiometric samples prepared using the vacuum arc melting technique. X-ray diffraction studies confirmed the cubic D 0 3 -type structure in these samples. M(H) curve revealed soft ferromagnetic behavior with low coercivity and good magnetic saturation. The magnetization vs temperature studies demonstrated a decrease in the Curie temperature from 906 to 620 K with an increase in Al composition. Notably, the Fe 73 Al 27 sample exhibited a substantial magnetic entropy change ( Δ S M = - 5.5 J kg - 1 K - 1 ) and a high relative cooling power (RCP = 307 J kg - 1 ) at 906 K. Further, the thermo-magnetic studies of these off-stoichiometric alloys have provided an insight into the Curie temperature dependency over the Al composition. The increase in the Al composition has shifted the Curie temperature towards the lower temperatures while changing the underlying crystallographic structure from B2 to D 0 3 .
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-024-06828-0