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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/1418

Title: Magnetic and magnetothermal properties of La(1-x)Nd(x)Fe(11.5)Al(1.5) compounds
Authors: KUMAR, P
SINGH, NK
SURESH, KG
NIGAM, AK
Keywords: la(fexal1-x)13 intermetallic compounds
itinerant-electron metamagnetism
entropy change
transition
gd-5(si2ge2)
field
Issue Date: 2008
Publisher: AMER INST PHYSICS
Citation: JOURNAL OF APPLIED PHYSICS,103(7)
Abstract: In this paper, we report the structural, magnetic, and magnetocaloric effect (MCE) of La(1-x)Nd(x)Fe(11.5)Al(1.5) (x=0.1,0.2) compounds. Temperature dependence of magnetization data shows that with Nd substitution, the nature of magnetic transition changes from second order transition to multiple first order transition. This observation is confirmed by the thermodynamic analysis using the Landau theory of phase transitions. The MCE has been calculated in terms of the isothermal magnetic entropy change (Delta S(M)) using the magnetization isotherms obtained at temperatures close to the transition temperature. The maximum values of Delta S(M) are found to be 5.4 and 4.6 J kg(-1) K(-1) of x=0.1 and x=0.2, respectively, for a field change of 50 kOe, whereas the value for the undoped compound is about 3 J kg(-1) K(-1). The refrigerant capacity has been calculated to be 544 J/kg K for x=0.1 and 470 J/kg K for x=0.2. (C) 2008 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.2836711
http://dspace.library.iitb.ac.in/xmlui/handle/10054/14592
http://hdl.handle.net/100/1418
ISSN: 0021-8979
Appears in Collections:Proceedings papers

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