Structural and Electrical Properties of Cobalt Ferrite Nanoparticles
A.B. Shinde

Dr. A.B. Shinde, P.G and Research Centre, Department of Physics, Abasaheb Garware College, Pune (Maharashtra), India.
Manuscript received on 10 September 2013 | Revised Manuscript received on 19 September 2013 | Manuscript Published on 30 September 2013 | PP: 64-67 | Volume-3 Issue-4, September 2013 | Retrieval Number: D1194093413/13©BEIESP
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Abstract: Cobalt ferrite nano-powders were obtained by sol-gel auto-combustion method using citric acid as a fuel. The metal nitrate to citric acid ratio was taken as 1:3. The as prepared powder of cobalt ferrite nanoparticles is annealed at 5500C for 4 hrs and the same powder was used for characterization and investigations of structural and electrical properties.The structural characterization of cobalt ferrite nanoparticles were done by X-ray diffraction technique. Micro-structural and morphological studies were carried out by scanning electron microscope technique and energy dispersive spectrum. The average crystallite size obtained by Scherrer’s formula is of the order of 34 nm. The grain size and specific surface area of the cobalt ferrite nanoparticles is 34 nm and 55 respectively. The lattice constant determined from XRD data is in the reported range (8.3783 A.U.). The porosity estimated from X- ray density and bulk density shows large value of the order of 47 %. The D.C electrical resistivity was investigated from room temperature to 850 K using two probe technique. The variation of dc electrical resistivity with temperature is explained in this work.
Keywords: Cobalt Ferrite, Nanoparticles, Sol-gel Auto Combustion.

Scope of the Article: Structural Engineering