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Near room temperature magneto caloric effect in V doped La(0.67)Ca(0.33)MnO(3) ceramics

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Title Near room temperature magneto caloric effect in V doped La(0.67)Ca(0.33)MnO(3) ceramics
 
Creator NISHA, P
SANTHOSH, PN
SURESH, KG
PAVITHRAN, C
VARMA, MR
 
Subject transport-properties
entropy change
magnetoresistance
transition
films
la0.7ca0.3mno3
manganites
mn
lamno3+delta
perovskites
magnetic measurements
x-ray diffraction
magnetically ordered materials:crystal structure and symmetry
 
Description La(0.67)Ca(0.33)MnO(3) doped with different amounts of V, resulting in the series La(0.67)Ca(0.33)Mn(1-x)V(x)O(3) [x = 0.03, 0.06, 0.1, 0.15, 0.25, 0.5] was synthesized by conventional solid-state ceramics route. Heat treatment conditions during synthesis were optimized to have small changes in the Curie temperature (T(C)). The compounds with x > 0.06 were found to have the additional LaVO(4) phase. A quantitative analysis of the extra phase with increase in V doping was investigated by the Rietveld refinement of the X-ray diffraction patterns. Variation of magnetic and magnetocaloric properties at different temperatures and magnetic fields was studied. Magnetocaloric effect has been studied in terms of isothermal magnetic entropy change (Delta S(M)). Magnetization was found to change drastically at around 275 K and the isothermal magnetic entropy change was found to peak in the temperature range 265-275 K. With increase in V content, Delta S(M) initially shows a considerable increase and then a decrease at higher V concentrations. (C) 2008
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-07-28T14:14:29Z
2011-12-26T12:59:38Z
2011-12-27T05:52:10Z
2011-07-28T14:14:29Z
2011-12-26T12:59:38Z
2011-12-27T05:52:10Z
2009
 
Type Article
 
Identifier JOURNAL OF ALLOYS AND COMPOUNDS, 478(1-2), 566-571
0925-8388
http://dx.doi.org/10.1016/j.jallcom.2008.11.091
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7422
http://hdl.handle.net/10054/7422
 
Language en