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On the nature of the magnetocaloric effect of the first-order magnetostructural transition

TitleOn the nature of the magnetocaloric effect of the first-order magnetostructural transition
Publication TypeJournal Article
Year of Publication2012
AuthorsGschneidner KA, Mudryk Y, Pecharsky VK
Journal TitleScripta Materialia
Volume67
Pages572-577
Date Published09
Type of ArticleArticle
ISBN Number1359-6462
Accession NumberWOS:000307910700010
Keywordsgd-5(si2ge2), intermetallic compounds, magnetic entropy change, magnetic properties, Metals and alloys, metamagnetic transition, ni-mn-ga, phase transformations, system, temperature
Abstract

Methods were developed to determine the structural entropy contribution to the total isothermal entropy change of materials which undergo a magnetostructural first-order phase transition. The structural entropies range from 4.5 to 45 J kg(-1) K-1 and are proportional to the volume differences of the phases involved in the transition. This correlation allows one to predict new giant magnetocaloric effect materials from crystallographic data. There is a critical magnetic field which must be exceeded to drive the structural transition to completion. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URL<Go to ISI>://WOS:000307910700010
DOI10.1016/j.scriptamat.2011.12.042
Alternate JournalScr. Mater.