Irreversibility in cooling and heating processes in the magnetocaloric MnAs and alloys

dc.creatorSharma, ALL
dc.creatorGama, S
dc.creatorCoelho, AA
dc.creatorde Campos, A
dc.date2008
dc.dateDEC 29
dc.date2014-07-30T14:35:25Z
dc.date2015-11-26T16:31:35Z
dc.date2014-07-30T14:35:25Z
dc.date2015-11-26T16:31:35Z
dc.date.accessioned2018-03-28T23:12:41Z
dc.date.available2018-03-28T23:12:41Z
dc.identifierApplied Physics Letters. Amer Inst Physics, v. 93, n. 26, 2008.
dc.identifier0003-6951
dc.identifierWOS:000262225700031
dc.identifier10.1063/1.3058712
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/60738
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/60738
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1270261
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionIrreversibility 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%.
dc.description93
dc.description26
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languageen
dc.publisherAmer Inst Physics
dc.publisherMelville
dc.publisherEUA
dc.relationApplied Physics Letters
dc.relationAppl. Phys. Lett.
dc.rightsaberto
dc.sourceWeb of Science
dc.subjectarsenic alloys
dc.subjectcooling
dc.subjectdifferential scanning calorimetry
dc.subjectdoping
dc.subjectentropy
dc.subjectheating
dc.subjectlatent heat
dc.subjectmagnetocaloric effects
dc.subjectmanganese alloys
dc.subjectmanganese compounds
dc.subjectMagnetic-properties
dc.subjectPhase-transition
dc.titleIrreversibility in cooling and heating processes in the magnetocaloric MnAs and alloys
dc.typeArtículos de revistas


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