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Type: Artigo de periódico
Title: Determination of the entropy change using the acoustic detection technique in the investigation of the magnetocaloric effect
Author: Soffner, ME
Mansanares, AM
Gandra, FCG
Coelho, AA
Gama, S
Carvalho, AMG
Pires, MJM
Guimaraes, AO
da Silva, EC
Abstract: In this paper we demonstrate the use of the acoustic detection as an alternative way to determine the entropy variation, Delta S(T), a parameter normally used to characterize the magnetocaloric effect. The measurements were performed for a Gd sample in the 252-316 K temperature range for magnetic fields from zero up to 50 kOe. The reversible adiabatic curves were built in a T versus H diagram, and specific heat data obtained at zero-magnetic field were employed to assign the entropy values of each curve. Subsequently, the entropy was plotted as a function of temperature for fixed magnetic fields, and therefore the isothermal entropy variation, Delta S(T), was found as a function of the temperature for several magnetic field steps.
Country: Inglaterra
Editor: Iop Publishing Ltd
Citation: Journal Of Physics D-applied Physics. Iop Publishing Ltd, v. 43, n. 44, 2010.
Rights: fechado
Identifier DOI: 10.1088/0022-3727/43/44/445002
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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