The Variation of Magnetic Properties of Nickel Ferrite by Annealing

Abstract

Nickel ferrite nanoparticles were synthesized by Co-precipitation method. The prepared powder was annealed at 500℃, 700℃ and 900℃. XRD analysis was used for composition and structure investigation. The detection and confirmation of the chemical bond in spinel ferrites were investigated by Fourier transmission infrared spectra (FTIR). Also the magnetic properties of the samples were measured by using a vibrating sample magnetometer (VSM). The XRD analysis revealed a pure ferrite phase with high crystallinity. The average crystallite size calculated by Sherrer's equation resulted in variation crystallite size from 9 to 21 nm depending upon the annealing temperature of the samples. FTIR analysis shows the presence of two vibrational bonds between 400-650 cm-1 corresponding to metal-oxygen interaction at tetrahedral and octahedral sites, respectively. Increasing the annealing temperature gave rise to the enhancement of saturation magnetization from 6 to 31emu/gr and the variation of coercivity between 2 and 80Oe.

Synthesis, characterization and heavy metal removal efficiency of nickel ferrite nanoparticles (NFN’s)

“…Heavy metals, organic pollutants, inorganic anions and bacteria have been reported to be successfully removed by various kinds of nanomaterials 21 . Recently, research on Nickel Ferrite Nanoparticles (NFNs) have attained considerable attention 22 because of the difference of their physical and chemical properties from those of the free atoms or molecules 8,16,23 as well as from the properties of the bulk solids and have wide range of potential applications. Due to its typical ferromagnetic properties, low conductivity, lower eddy current losses and high electrochemical stability.…”