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

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 in...

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Bibliographic Details
Published inMetals (Basel ) Vol. 9; no. 11; p. 1144
Main Authors Moreno-Ramírez, Luis M., Delgado-Matarín, Antonio, Law, Jia Yan, FRANCO, Victorino, Conde, Alejandro, Giri, Anit K.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.11.2019
Subjects
Alloys
Cooling
direct ∆tad measurement
Heusler alloys
Magnetic fields
magnetocaloric materials
nimnin heusler alloys
Phase transitions
Protocol
Temperature dependence
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Summary: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.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9111144