1 گروه فیزیک، دانشکده علوم پایه، دانشگاه ملایر
2 گروه فیزیک، دانشکده علوم پایه، دانشگاه پوترا، مالزی
عنوان مقاله [English]
In this research, magnesium ferrite, copper ferrite and cadmium ferrite nanoparticles were synthesized by thermal treatment method by using a solution that contained polyvinyl alcohol PVA. The structural characteristics of the calcined samples were determined by X-ray diffractionXRD that the results confirmed the presence of crystal phases in the all ferrite nanoparticles. Field emission scanning electron microscopeFESEM obtained the particle sizes of the 5 to 8, 10 to 33 and 47 to 138 nm for magnesium ferrite, copper ferrite and cadmium ferrite nanoparticles respectively. Fourier transform infrared spectroscopyFT-IR confirmed the presence of metal oxide bands for the all calcined samples. Moreover, FT-IR spectra showed that the modes which related to organic compounds removed in more than 773 K. Magnetic properties such as saturation magnetizationMs and magnetic coercivityHc were obtained at room temperature by using a vibrating sample magnetometerVSM which demonstrated cadmium and copper ferrites had ferromagnetic behaviors and magnesium ferrite had superparamagnetic. Electron paramagnetic resonanceEPR spectroscopy showed the existence of unpaired electrons for the all ferrite nanoparticles and measured the peak-to-peak line width ΔHpp, the resonant magnetic fieldHr and the g-factor values.