Magnetocaloric response of amorphous and nanocrystalline Cr-containing Vitroperm-type alloys

The broad compositional range in which transition metal (TM) based amorphous alloys can be obtained, yields an easily tunable magnetocaloric effect (MCE) in a wide temperature range. In some TM-based alloys, anomalous behaviors are reported, as a non-monotonous trend with magnetic moment (e.g. FeZrB...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2016-07, Vol.409, p.56-61
Main Authors: Moreno-Ramírez, L.M., Blázquez, J.S., Franco, V., Conde, A., Marsilius, M., Budinsky, V., Herzer, G.
Format: Article
Language:English
Subjects:
Alloys
Amorphous alloys
Chromium base alloys
Curie temperature
Entropy
Magnetic moment
Magnetocaloric effect
Metallic glasses
Nanocrystalline alloys
Nanocrystals
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Summary:The broad compositional range in which transition metal (TM) based amorphous alloys can be obtained, yields an easily tunable magnetocaloric effect (MCE) in a wide temperature range. In some TM-based alloys, anomalous behaviors are reported, as a non-monotonous trend with magnetic moment (e.g. FeZrB alloys). Moreover, in certain Cr-containing Vitroperm alloys anomalously high values of the magnetic entropy change were published. In this work, a systematic study on MCE response of Cr-containing amorphous alloys of composition Fe74-xCrxCu1Nb3Si15.5B6.5 (with x=2, 8, 10, 12, 13, 14 and 20) has been performed in a broad Curie temperature range from 100K to 550K. Curie temperature and magnetic entropy change peak of the amorphous alloys decrease with the increase of Cr content at rates of −25.6K/at% Cr and −54mJkg−1K−1/at% Cr, respectively, following a linear trend with the magnetic moment in both cases. The presence of nanocrystalline phases has been considered as a possible cause in order to explain the anomalies. The samples were nanocrystallized in different stages, however, the magnetocaloric response decreases as crystallization progresses due to the large separation of the Curie temperatures of the two phases. •Study of magnetocaloric effect of amorphous and nanocrystalline Cr-Vitroperm alloys.•Cr content decreases the magnetocaloric response and the Curie temperature.•Nanocrystallization reduces MCE and modifies TC in a non-monotonous way.•The large difference between TC of phases decreases MCE of composite.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2016.02.087