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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 ferroto 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 ( ∆S) observed in the vicinity of the Curie point is equal to 0.85 J/(kgK) 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.

acta physica polonica. a

Magnetocaloric Effect in Amorphous and Partially Crystallized Fe80Zr7Cr6Nb2Cu1B4 Alloy