✍ Scribed by I. Škorvánek; J. Kováč; J. Marcin; P. Švec; D. Janičkovič
No coin nor oath required. For personal study only.
The magnetocaloric effect in series of amorphous and nanocrystalline Fe 81-x Cr x Nb 7 B 12 (numbers indicate at.%, x = 0 and 3.5) samples has been studied by evaluating the magnetic entropy changes, S m , from magnetization data. The addition of chromium to the ternary Fe 81 Nb 7 B 12 alloy results in a decrease of the Curie temperature of amorphous sample, T c (am), from 363 to 279 K, which makes this Cr containing alloy an interesting material for potential magnetic refrigeration applications near room temperature. Upon magnetic field change from 0 to 0.7 T, the maximum entropy change located at the T c (am) of non-crystallized ribbons has been found to be about 0.7 J kg -1 K -1 . The progressive nanocrystallization of amorphous samples results in a more diffuse ferro-/paramagnetic transition, which causes a decrease of the magnetic entropy changes and at the same time the S m peak becomes broadened. The observed S m values compare favorably with other amorphous Fe-based alloys.
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