Open AccessDependence of magnetic and structural properties of Ni<sub>0.5</sub> M<sub>0.5</sub> Fe<sub>2</sub>O<sub>4</sub> (M=Co, Cu) nanoparticles synthesized by citrate precursor method on annealing temperature
Author(s) -
A. Narayan,
Rakesh Kumar Singh,
A.A. Yadav,
K. Prasad
Publication year - 2011
Publication title -
international journal of engineering science and technology
Language(s) - English
Resource type - Journals
ISSN - 2141-2839
DOI - 10.4314/ijest.v2i8.63782
Subject(s) - spinel , tetragonal crystal system , diffractometer , magnetization , materials science , nucleation , rietveld refinement , nanoparticle , annealing (glass) , ferrite (magnet) , lattice constant , analytical chemistry (journal) , crystallography , nuclear chemistry , metallurgy , chemistry , nanotechnology , crystal structure , diffraction , physics , magnetic field , environmental chemistry , quantum mechanics , organic chemistry , optics , composite material
Ni 0.5 M 0.5 Fe 2 O 4 (M = Co, Cu) ferrite nanoparticles were synthesized using citrate precursor method. The citrate precursor was annealed at temperatures 400 o C, 450 o C, 500 o C and 550 o C. 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 450 o C display cubic spinel structure while the particles formed at temperature higher than 450 o C display a tetragonal spinel structure. Sharp changes were observed in particle size, lattice constant, magnetization and retentivity in the range 450-500 o C temperature suggesting that nucleation/growth mechanism is different at temperatures above and below a critical temperature in this range. Keywords : Ferrites, magnetic nanoparticles, citrate precursor, magnetization International Journal of Engineering, Science and Technology , Vol. 2, No. 8, 2010, pp. 73-79
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