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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.
Gama S.
Coelho A.A.
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.
Rights: aberto
Identifier DOI: 10.1063/1.3058712
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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