Self-propagating High Temperature Synthesis of Ni0.35Zn0.65Fe2O4 using Various Ni-containing Species

Ni0.35Zn0.65Fe2O4 were respectively prepared by self-propagating higha2temperature synthesis (SHS) method in two different conditions. The reactions of Fe, Fe2O3, ZnO, NaClO4 and various Ni-containing species (Ni, NiO, NiCO3) were carried out in air and in the presence of an external magnetic field of 1.3T. The combustion temperature was measured by infrared thermo detector. SHS products and sintered end-products were characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM) and vibrating sample magnetometry (VSM). The results show that Ni0.35Zn0.65Fe2O4 synthesized using Ni and NiO as nickel sources have better magnetic properties with no miscellaneous phase, lower coercivity and the larger specific saturation magnetization, than the products synthesized using NiCO3 as nickel sources which contain impurity phase and have bad magnetic properties. The specific saturation magnetization of Ni0.35Zn0.65Fe2O4 in 1.3T magnetic field is improved. Nickel powder can replace nickel protoxide as nickel source to synthesize nickel zinc ferrite by SHS.