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Article

Direct and Indirect Determination of the Magnetocaloric Effect in the Heusler Compound Ni1.7Pt0.3MnGa

1
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany
2
Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas 13083-970, Brazil
3
Faculty of Physics, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany
4
Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany
5
School of Materials Science and Technology, Indian Institute of Technology (BHU), Varanasi 221005, India
*
Author to whom correspondence should be addressed.
Academic Editor: Jürn W. P. Schmelzer
Entropy 2021, 23(10), 1273; https://doi.org/10.3390/e23101273
Received: 23 August 2021 / Revised: 20 September 2021 / Accepted: 23 September 2021 / Published: 29 September 2021
(This article belongs to the Special Issue Thermodynamics and Phase Transitions in Magnetic Materials)
Magnetic shape-memory materials are potential magnetic refrigerants, due the caloric properties of their magnetic-field-induced martensitic transformation. The first-order nature of the martensitic transition may be the origin of hysteresis effects that can hinder practical applications. Moreover, the presence of latent heat in these transitions requires direct methods to measure the entropy and to correctly analyze the magnetocaloric effect. Here, we investigated the magnetocaloric effect in the Heusler material Ni1.7Pt0.3MnGa by combining an indirect approach to determine the entropy change from isofield magnetization curves and direct heat-flow measurements using a Peltier calorimeter. Our results demonstrate that the magnetic entropy change ΔS in the vicinity of the first-order martensitic phase transition depends on the measuring method and is directly connected with the temperature and field history of the experimental processes. View Full-Text
Keywords: first-order transitions; magnetocaloric effect; Heusler materials first-order transitions; magnetocaloric effect; Heusler materials
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MDPI and ACS Style

dos Reis, R.D.; Caron, L.; Singh, S.; Felser, C.; Nicklas, M. Direct and Indirect Determination of the Magnetocaloric Effect in the Heusler Compound Ni1.7Pt0.3MnGa. Entropy 2021, 23, 1273. https://doi.org/10.3390/e23101273

AMA Style

dos Reis RD, Caron L, Singh S, Felser C, Nicklas M. Direct and Indirect Determination of the Magnetocaloric Effect in the Heusler Compound Ni1.7Pt0.3MnGa. Entropy. 2021; 23(10):1273. https://doi.org/10.3390/e23101273

Chicago/Turabian Style

dos Reis, Ricardo D., Luana Caron, Sanjay Singh, Claudia Felser, and Michael Nicklas. 2021. "Direct and Indirect Determination of the Magnetocaloric Effect in the Heusler Compound Ni1.7Pt0.3MnGa" Entropy 23, no. 10: 1273. https://doi.org/10.3390/e23101273

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