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Type: Artigo de periódico
Title: The isothermal variation of the entropy (Delta S-T) may be miscalculated from magnetization isotherms in some cases: MnAs and Gd5Ge2Si2 compounds as examples
Author: Carvalho, AMG
Coelho, AA
von Ranke, PJ
Alves, CS
Abstract: The determination of the isothermal variation of the entropy (Delta S-T) is discussed in the present work We show that Delta S-T has very different profiles and magnitudes when calculated from M vs. H or M vs. T experimental data. For MnAs compound, Delta S-T A obtained from M vs. T data does not present a colossal peak This result and the agreement between theoretical and experimental non-colossal magnetocaloric effect indicate that the colossal peak may be miscalculated from M vs. H experimental data. For Gd5Ge2Si2 compound, Delta S-T obtained from M vs. T data does not present the peak observed in Delta S-T from M vs. H data. (c) 2011 Elsevier B.V. All rights reserved.
Subject: Intermetallics
Magnetocaloric effect
Magnetic measurements
Country: Suíça
Editor: Elsevier Science Sa
Citation: Journal Of Alloys And Compounds. Elsevier Science Sa, v. 509, n. 8, n. 3452, n. 3456, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2010.12.088
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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