عنوان مقاله [English]
In this work, lead spinel ferrite nanoparticles (PbFe2O4) was synthesized by sol-gel method. A gel of metal nitrates with proper molar ratios was firstly prepared and the effect annealing temperature on their structural and magnetic properties have been investigated. The annealing temperature of samples was determined by thermal analysis (TG/DTA). The structural and magnetic properties of samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectrophotometer (FT-IR), and vibrating sample magnetometer (VSM). The results of x-ray diffraction patterns showed that by increasing annealing temperature, lead spinel phase percentage of samples increase and impurity phases such as lead oxide and hematite have been decreased. Also, the results of field emission scanning electron microscope showed that the particles size is nano, but particles are bounded together. Also nanoparticles size increases with annealing temperature and well-defined shape. The Hysteresis loops of samples show that by increasing annealing temperature the coercivity was increased. The results of Fourier transform infrared spectrometry annealed samples show that structure of samples at temperatures of 650 and 700°C is spinel.