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The magnetocaloric effect, magnetic refrigeration and ductile intermetallic compounds

TitleThe magnetocaloric effect, magnetic refrigeration and ductile intermetallic compounds
Publication TypeJournal Article
Year of Publication2009
AuthorsGschneidner KA
Journal TitleActa Materialia
Volume51
Pages18-28
Date Published01/01
ISBN Number1359-6454
Accession NumberISI:000263695300003
Keywordsbehavior, crystal structure, electrical-resistance, field, fracture-toughness, gd-5(si2ge2), magnetic properties, mechanical properties, mechanical-properties, phase transformations, rare earth alloys, silicon, systems, transition, yag
Abstract

The magnetocaloric effect (MCE) is the ability of a magnetic material. particularly near its Curie temperature,. to heat LIP when a magnetic field is applied (magnetization) and to cool when the field is removed (demagnetization). A number of new materials, especially Gd-5(Si4-xGex), have outstanding MCE properties near room temperature, significantly better than the well-known standard, Gd metal. The giant MCE effect observed in the Gd-5(Si4-xGex) alloys for x >= 2 is due to a coupled magnetostructural transformation. The coupled transformation also accounts for several other interesting phenomena: giant magnetoresistance; colossal magnetostriction, spontaneous generation of voltage; unusual training, dynamical and thermal phenomena; acoustic emissions; and a novel glass-like kinetically retarded state. Extension of the work on the MCE has led to the near commercialization of magnetic refrigeration as a viable cooling technology, and to the discovery of ductile rare earth transition metal (RM) B2 CsCl-type intermetallic compounds. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URL<Go to ISI>://000263695300003
DOI10.1016/J.Actamat.2008.08.048