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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|
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.|
|Editor:||Iop Publishing Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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