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

A Narayan, Rakesh Kumar Singh, A Yadav, Kamal Prasad
2011 International Journal of Engineering, Science and Technology  
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
more » ... 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.
doi:10.4314/ijest.v2i8.63782 fatcat:kyyghd63mrbz7ns7wie3nuq3p4