Magnetocaloric Effect in Amorphous and Partially Crystallized Fe80Zr7Cr6Nb2Cu1B4 Alloy
A. Łukiewskaa, J. Olszewskia, M. Hasiakb and P. Gębaraa
aCzęstochowa University of Technology, Institute of Physics, Armii Krajowej 19, 42-200 Częstochowa, Poland
bWrocław University of Science and Technology, Smoluchowskiego 25, 50-370 Wrocław, Poland
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In the present work the microstructure and thermomagnetic properties of Fe80Zr7Cr6Nb2Cu1B4 ribbon in the as-quenched state and after the accumulative annealing in the temperature range 600-800 K for 10 min were studied using Mössbauer spectroscopy and vibrating sample magnetometry. The second order phase transition from ferro- to paramagnetic state is observed. The Curie temperature TC defined as inflection point on the magnetization versus temperature curve recorded on zero-field cooled mode equals 262.5 K for the as-quenched material. With increasing the annealing temperature increase of TC is observed. The maximum value of the magnetic entropy change (-Δ S) observed in the vicinity of the Curie point is equal to 0.85 J/(kg K) for the alloy in the as-quenched state. Moreover, for the samples annealed up to 750 K for 10 min the low intensity maximum at about 190 K related to the supplementary magnetic phase is observed. The presence of this phase was confirmed as additional component visible on hyperfine field distributions of Mössbauer spectra.

DOI: 10.12693/APhysPolA.133.676
PACS numbers: 65.60.+a, 75.50.Kj, 75.50.Bb, 75.30.Sg