Mixed mode electrical transport behavior in nanocrystalline La-Ca-Manganite synthesized by microwave refluxing
DSpace at IIT Bombay
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Title |
Mixed mode electrical transport behavior in nanocrystalline La-Ca-Manganite synthesized by microwave refluxing
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Creator |
NAYAK, BB
VITTA, S BAHADUR, D |
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Subject |
colossal magnetoresistance
field magnetoresistance doped manganites mn-o la1-xcaxmno3 phase la0.67ca0.33mno3 perovskites conduction films |
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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.
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Publisher |
WILEY-V C H VERLAG GMBH
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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 |
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Type |
Article
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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 |
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Language |
en
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