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Near room temperature magnetocaloric properties of Fe substituted La0.67Sr0.33MnO3

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Title Near room temperature magnetocaloric properties of Fe substituted La0.67Sr0.33MnO3
 
Creator RESHMI, CP
PILLAI, SS
SURESH, KG
VARMA, MR
 
Subject Magnetic materials
X-ray diffraction
Magnetic properties
MAGNETIC ENTROPY CHANGE
300 K
COLOSSAL MAGNETORESISTANCE
MANGANITES
TRANSITION
 
Description The effect of Fe substitution in the polycrystalline La0.67Sr0.33MnO3 has been investigated. Substitution of Fe decreases the Curie temperature of La0.67Sr0.33MnO3 from 370 K to near room temperature in x < 0.3 samples, which show well defined ferromagnetic-paramagnetic transition, whereas x > 0.3 exhibit a frustrated glassy behaviour, evident from the ZFC and FC magnetization data. The magnetic entropy change calculated from the M-H-T data of x = 0.05 and x = 0.1 show broad peak and the respective values of -Delta S-M and RCP are found to be about 2.8 J/kg K, 166 J/kg (at T-C = 275 K) and 3.3 J/kg K, 153 J/kg (at T-C = 266 K) under a field of 50 kOe. Due to the wider distribution of the magnetic entropy, these two compounds can be used as refrigerants for room temperature magnetic refrigeration applications. The critical behaviour of the two compositions was also estimated from the field dependent magnetic entropy change. (C) 2012 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-10-15T10:59:10Z
2014-10-15T10:59:10Z
2013
 
Type Article
 
Identifier MATERIALS RESEARCH BULLETIN, 48(2)889-894
http://dx.doi.org/10.1016/j.materresbull.2012.11.084
http://dspace.library.iitb.ac.in/jspui/handle/100/14806
 
Language en