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Type: Artigo de periódico
Title: On the determination of the magnetic entropy change in materials with first-order transitions
Author: Caron, L
Ou, ZQ
Nguyen, TT
Thanh, DTC
Tegus, O
Bruck, E
Abstract: An accurate method to determine the magnetic entropy change in materials with hysteretic first-order transitions is presented, which is needed to estimate their potential for applications. We have investigated the effect of the maximal entropy change derived from magnetization measurements performed in different measurement processes. The results show that the isothermal entropy change can be derived from the Maxwell relations even for samples with large thermal hysteresis. In the temperature region with hysteresis, over estimating the entropy change can be avoided by measuring the isothermal magnetization of the sample after it is cooled from the paramagnetic state to the measurement temperature. In this way the so-called peak effect is not observed as shown here for a few compounds. (C) 2009 Elsevier B.V. All rights reserved.
Subject: Magnetization process
Magnetic entropy
First-order transition
Magnetic refrigeration
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2009.06.086
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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