The Temperature Effect on Magnetic Properties of NiFe2O4 Nanoparticles

In this study, NiFe2O4 nanoparticles (NPs) were fabricated via auto citric acid sol-gel route at three different temperatures (900, 1000 and 1100 A degrees C). X-ray diffraction (XRD) and Fourier transform infrared were utilized to analyze the structural properties of magnetic nanoparticles (MNPs). XRD patterns reflect the formation of spinel ferrites without the existence of any kind of secondary phases. Morphological features of resultant MNPs were characterized by scanning electron microscopy. The XRD results show that the crystallite size increases from 30.75 to 42.32 nm with increasing the temperature of the calcination process in a distinct linear trend. The enhancement of the saturation magnetization and magnetic moment of the uniaxial NiFe2O4 NPs were studied and varying from 35 to 40 emu/g and 1.47-1.68 A mu(B,) respectively, as the temperature increases. Mossbauer parameters for different calcination temperature have been determined. The occupation ratio of Ni2+ ions at the A sites decreases from 53 to 49% with increasing calcination temperature from 900 to 1100 A degrees C.