Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/10054/7407
Title: Microstructure, magnetic properties and magnetocaloric effect in melt-spun Ni-Mn-Ga ribbons
Authors: RAO, NVR
GOPALAN, R
CHANDRASEKARAN, V
SURESH, KG
Keywords: Entropy Change
Transition
Alloys
Refrigeration
Issue Date: 2009
Publisher: ELSEVIER SCIENCE SA
Citation: JOURNAL OF ALLOYS AND COMPOUNDS, 478(1-2), 59-62
Abstract: Structural transformation, microstructure and magnetocaloric effect (MCE) were investigated in melt-spun Ni(55)Mn(20.6)Ga(24.4) and Ni(55)Mn(19.6)Ga(25.4) ribbons. Magnetic and thermal studies of the ribbons revealed the occurrence of simultaneous structural and magnetic transitions near room temperature with a narrow thermal hysteresis of magnetization approximate to 2 K. Maximum entropy changes (Delta S(M)) of -9.5 and -10.4J/kg K have been obtained at 309 K for a field change of 2 T in Ni(55)Mn(20.6)Ga(25.4) and Ni(55)Mn(19.6)Ga(25.4) ribbons, respectively. The Ni(55)Mn(19.6)Ga(25.4) ribbon exhibits refrigeration capacity (RC) of 47 J/kg with low average hysteresis loss (approximate to 1.5J/kg) at the merged structural and magnetic transition temperature. (C) 2008
URI: http://dx.doi.org/10.1016/j.jallcom.2008.12.015
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7407
http://hdl.handle.net/10054/7407
ISSN: 0925-8388
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