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Dependence of magnetic and structural properties of Ni0.5 M0.5 Fe2O4 (M=Co, Cu) nanoparticles synthesized by citrate precursor method on annealing temperature

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Author(s): Rakesh Kumar Singh | A. Yadav | Kamal Prasad | A. Narayan

Journal: International Journal of Engineering, Science and Technology
ISSN 2141-2820

Volume: 2;
Issue: 8;
Start page: 73;
Date: 2010;

Keywords: Ferrites | magnetic nanoparticles | citrate precursor | magnetization.

ABSTRACT
Ni0.5M0.5Fe2O4 (M = Co, Cu) ferrite nanoparticles were synthesized using citrate precursor method. The citrate precursor was annealed at temperatures 400oC, 450oC, 500oC and 550oC. The annealed powders were characterized using X-ray diffractometer (XRD) and vibrating sample magnetometer (VSM). Observed XRD data was further analyzed using Rietveld analysis which showed that particles annealed at temperatures upto 450oC display cubic spinel structure while the particles formed at temperature higher than 450oC display a tetragonal spinel structure. Sharp changes were observed in particle size, lattice constant, magnetization and retentivity in the range 450-500oC temperature suggesting that nucleation/growth mechanism is different at temperatures above and below a critical temperature in this range.
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