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Large reversible magnetocaloric effect in RNi compounds

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Title Large reversible magnetocaloric effect in RNi compounds
 
Creator KUMAR, P
SURESH, KG
NIGAM, AK
GUTFLEISCH, O
 
Subject magnetic entropy change
temperature
nickel
lafe11.57si1.43
gd-5(si2ge2)
transition
crystal
 
Description In an attempt to identify novel magnetic refrigerant materials, we have studied the magnetic and magnetocaloric properties in RNi compounds with R = Gd, Ho and Er. GdNi is a simple ferromagnet with a collinear structure in contrast to HoNi and ErNi, in which the moments of rare earth sublattice are arranged non-collinearly. The magnetic ordering temperatures are observed to be 69 K, 36.5 K and 10 K for GdNi, HoNi and ErNi, respectively. The maximum values of magnetocaloric effect (Delta S(M)(max)) are found to be 17 J kg(-1) K(-1), 15 J kg(-1) K(-1) and 29 J kg(-1) K(-1) for Gd, Ho and Er, respectively, for an applied field of 50 kOe. The relative cooling power has been calculated to be 527 J kg(-1) K(-1), 780 J kg(-1) K(-1) and 510 J kg(-1) K(-1) for GdNi, HoNi and ErNi. These values compare well with those of many potential materials whose magnetic transitions are in the same range as in the present case.
 
Publisher IOP PUBLISHING LTD
 
Date 2011-08-03T19:41:11Z
2011-12-26T12:54:22Z
2011-12-27T05:42:13Z
2011-08-03T19:41:11Z
2011-12-26T12:54:22Z
2011-12-27T05:42:13Z
2008
 
Type Article
 
Identifier JOURNAL OF PHYSICS D-APPLIED PHYSICS, 41(24), -
0022-3727
http://dx.doi.org/10.1088/0022-3727/41/24/245006
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9133
http://hdl.handle.net/10054/9133
 
Language en