Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/60738
Type: Artigo de periódico
Title: Irreversibility in cooling and heating processes in the magnetocaloric MnAs and alloys
Author: Sharma, ALL
Gama, S
Coelho, AA
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)>S(Fe)(c)>S(Cu)(c), and for the heating process, S(Fe)(h)approximate to S(Mn)(h)>S(Cu)(h). The difference in the entropy obtained between processes was found to be as high as 37%.
Subject: arsenic alloys
cooling
differential scanning calorimetry
doping
entropy
heating
latent heat
magnetocaloric effects
manganese alloys
manganese compounds
Country: EUA
Editor: Amer Inst Physics
Rights: aberto
Identifier DOI: 10.1063/1.3058712
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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