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|Type:||Artigo de periódico|
|Title:||Irreversibility In Cooling And Heating Processes In The Magnetocaloric Mnas And Alloys|
|Author:||Lima Sharma A.L.|
De Campos A.
|Abstract:||Irreversibility of adiabatic processes in the magnetocaloric MnAs and alloys is presented here. We used a differential scanning calorimeter to record the heat flux as a function of the temperature and applied field for MnAs (Mn, X)As, where X stands for Fe or Cu in 0.6% of doping. We extracted the latent heat and entropy in a cycle. In the cooling process, we observed that S Mn c > SFe c > S Cu c, and for the heating process, SFe h ≈ SMn h > SCu h. The difference in the entropy obtained between processes was found to be as high as 37%. © 2008 American Institute of Physics.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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