Please use this identifier to cite or link to this item: http://hdl.handle.net/10603/123666
Title: Development of Chemical Methodologies for Synthesis of Fe2O3 and Ni1 xZnxFe2O4 Nanopowders and Study of their Structural and Physical Properties
Researcher: PRITA PANT SARANGI
Guide(s): Dr. Narendra Nath Ghosh
Keywords: Chemical Methodologies, Nanopowder
University: Birla Institute of Technology and Science
Completed Date: 1/7/2010
Abstract: Nanostructured and#945;-Fe2O3 and series of Ni-Zn ferrite powders have gained immense importance in recent years due to their myriad potential applications in diverse fields. In this research work, newlinethree simple chemical methodologies have been successfully developed in order to synthesize single phase, nanostructured and#945;-Fe2O3 and series of Ni-Zn ferrite powders. The average particle size of the synthesized nanoparticles lies in the range of ~ 15-50 nm. Nanoparticles of iron oxide are elongated while nanoparticles of Ni-Zn ferrite are round in shape. The synthesized nanopowders have high room temperature resistivity (105 -109 and#937; cm) although the variation of resistivity with respect to temperature is affected by the presence of humidity in the atmosphere. newlineHowever, the ferrite nanopowders sintered at 12000C, synthesized by all three chemical methodologies, exhibit the typical NTCR (negative temperature coefficient of resistance) behavior of ferrites. Room temperature magnetic measurements reveal that the synthesized Ni-Zn ferrite nanopowders possess saturation magnetization that varies between 30-60 emu/g depending on the method of preparation and the composition of the samples. newlineAdvantages offered by these developed aqueous solution based chemical methods that make them attractive are: newline(i) metal alkoxides or complex metal compounds, which are expensive, difficult to handle,synthesize, and sometimes toxic have not been used in the developed methods. newline(ii) strong acid, base or organic solvents have not been used in any of the methods. newline(iii) use of simple and cheap metal nitrates as starting materials and water as solvent helps in reducing the processing cost as compared to other reported wet chemical methods. Moreover, newlineany elaborate experimental setup is not required for the synthesis of nanopowders by these methods. newline(iv) Unlike other reported methods, Zn loss is not observed during high temperature sintering of pellets, prepared by the synthesized nanopowders.
Pagination: 18MB
URI: http://hdl.handle.net/10603/123666
Appears in Departments:Chemical Engineering

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