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Mixed mode electrical transport behavior in nanocrystalline La-Ca-Manganite synthesized by microwave refluxing

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Title Mixed mode electrical transport behavior in nanocrystalline La-Ca-Manganite synthesized by microwave refluxing
 
Creator NAYAK, BB
VITTA, S
BAHADUR, D
 
Subject colossal magnetoresistance
field magnetoresistance
doped manganites
mn-o
la1-xcaxmno3
phase
la0.67ca0.33mno3
perovskites
conduction
films
 
Description Nanocrystalline La0.67Ca0.33MnO3 powders were prepared from organic precursors using a microwave synthesis technique. A variation of the precursor solution pH and annealing temperature was found to change the effective Mn4+ concentration which leads to variations in electronic behavior. In all the cases however, a single phase microstructure was observed showing the stability of orthorhombic manganite. The nanocrystalline manganite prepared from a solution with a pH of 10.5 has the lowest Mn4+ and accordingly low electrical and magnetic transition temperatures. The electrical transport behavior of powders prepared from precursor solutions with pH of 11.5 and 12.5 could be modeled using an effective medium approach across the whole temperature range, 30 K to 300 K. The magnetoresistance in these nanocrystalline manganites increases with decreasing temperature, an effect of increased grain boundaries.
 
Publisher WILEY-V C H VERLAG GMBH
 
Date 2011-09-01T18:33:01Z
2011-12-26T12:59:45Z
2011-12-27T05:52:33Z
2011-09-01T18:33:01Z
2011-12-26T12:59:45Z
2011-12-27T05:52:33Z
2005
 
Type Article
 
Identifier PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 202(14), 2790-2799
0031-8965
http://dx.doi.org/10.1002/pssa.200521247
http://dspace.library.iitb.ac.in/xmlui/handle/10054/12840
http://hdl.handle.net/10054/12840
 
Language en