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Open AccessArticle

Influence of Thermal and Magnetic History on Direct ΔTad Measurements of Ni49+xMn36−xIn15 Heusler Alloys

1
Dpto. Física de la Materia Condensada ICMSE-CSIC, Universidad de Sevilla, P.O. Box 1065, 41080 Sevilla, Spain
2
CCDC Army Research Laboratory, Aberdeen Proving Ground, MD 21005, USA
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1144; https://doi.org/10.3390/met9111144
Received: 23 September 2019 / Revised: 16 October 2019 / Accepted: 23 October 2019 / Published: 25 October 2019
In the present work, using Heusler Ni49+xMn36-xIn15 (with x = 0 and 0.5) alloys, it is shown that the choice of the appropriate measurement protocol (erasing the prior state of the sample in between experiments) in ∆Tad first shot characterization is crucial for obtaining reliable results. Unlike indirect measurements, for which incorrect protocols produce overestimates of the characteristics of the material, erroneous direct measurements underestimate ∆Tad in the region close to its first order phase transition. The error in ∆Tad is found to be dependent on the temperature step used, being up to ~40% underestimation, including a slight shift in its peak temperature. View Full-Text
Keywords: magnetocaloric materials; direct ∆Tad measurement; NiMnIn Heusler alloys magnetocaloric materials; direct ∆Tad measurement; NiMnIn Heusler alloys
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MDPI and ACS Style

Moreno-Ramírez, L.M.; Delgado-Matarín, A.; Law, J.Y.; FRANCO, V.; Conde, A.; Giri, A.K. Influence of Thermal and Magnetic History on Direct ΔTad Measurements of Ni49+xMn36−xIn15 Heusler Alloys. Metals 2019, 9, 1144.

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