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Type: Artigo de periódico
Title: The Isothermal Variation Of The Entropy (Δst) May Be Miscalculated From Magnetization Isotherms In Some Cases: Mnas And Gd 5ge2si2 Compounds As Examples
Author: Carvalho A.M.G.
Coelho A.A.
Von Ranke P.J.
Alves C.S.
Abstract: The determination of the isothermal variation of the entropy (ΔS T) is discussed in the present work. We show that ΔS T has very different profiles and magnitudes when calculated from M vs. H or M vs. T experimental data. For MnAs compound, ΔST 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, ΔST obtained from M vs. T data does not present the peak observed in ΔST from M vs. H data. © 2011 Elsevier B.V. All rights reserved.
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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