Structure and Magnetic Studies of Cobalt Nanoparticles Prepared by Modified Polyol Process

G. Chandraprabha¹ , T. Sankarappa² , T.Sujatha ³

1. Dept. of Physics, Gulbarga University, Gulbarga, India.
2. Dept. of Physics, Gulbarga University, Gulbarga, India.

Correspondence should be addressed to: Physics, Government Higher Primary School, Gulbarga, India.

Section:Research Paper, Product Type: Isroset-Journal
Vol.5 , Issue.4 , pp.17-20, Aug-2017

Online published on Aug 20, 2017

Copyright © G. Chandraprabha, T. Sankarappa, T.Sujatha . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Cobalt nanoparticles were prepared by following the modified polyol process. The reduction of cobalt salt was carried out using hydrazine hydrate. The x-ray diffraction pattern of the as prepared cobalt sample revealed amorphous nature and annealed particles exhibited crystallinity. Crystallite sizes were determined using Debye Scherrer equation. Surface morphology has been investigated using Scanning Electron Microscopy (SEM). Average particle size estimated from SEM image was 32 nm. Magnetic properties of the as prepared particles were studied at 10K and 300K in a SQUID magnetometer. A slight decrease in saturation magnetization and appreciable decrease in coercive field has been noted as the temperature was increased from 10K to 300K. These results were discussed in view of existing literature.

Key-Words / Index Term :
Cobalt, nanoparticles, XRD, SQUID, magnetization

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