Preparation of nanocomposite working substances for room-temperature magnetic refrigeration

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)103-108
Journal / PublicationJournal of Magnetism and Magnetic Materials
Volume163
Issue number1-2
Publication statusPublished - Oct 1996

Abstract

The copper-sheathed rolling technique has been developed for the formation of room-temperature magnetic refrigerant powders of Gd0.85Tb0.15, Gd0.75Zn0.25 and Gd0.85Y0.15 into practical nanocomposite ribbons. The as-prepared ribbons, 0.5-1.0 mm thick, 10 mm wide and 1.5 m long, had excellent surface quality, even thickness, satisfactory toughness as well as mechanical flexibility, and show significant magnetocaloric effects (MCE). It was found that the Curie temperatures of the as-prepared nanocomposite ribbons decreased, while their specific heats increased significantly, compared with the same bulk materials. The MCE of Gd0.85Tb0.15 and Gd0.75Zn0.25 nanocomposites decreased but that of Gd0.85Y0.15 nanocomposite exhibited a distinct increase. A quantitative analysis of the influence of the preparation parameters on the MCE is reported.

Research Area(s)

  • Magnetic refrigeration, Mechanical deforming, Nanocomposite solids, Rare earth