关键词: 镍锌铁氧体, 自蔓延高温合成, 磁场, 磁性能

Abstract: Ni_0.35Zn_0.65Fe₂O₄ were respectively prepared by self-propagating hightemperature 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 Ni_0.35Zn_0.65Fe₂O₄ 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 Ni_0.35Zn_0.65Fe₂O₄ in 1.3T magnetic field is improved. Nickel powder can replace nickel protoxide as nickel source to synthesize nickel zinc ferrite by SHS.

Key words: nickel-zinc ferrite, self-propagating high-temperature synthesis, magnetic field, magnetic performance