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采用交变磁场诱导溶胶凝胶自蔓延法制备Mn0.6Zn0.4Fe2O4型纳米粉体,利用X射线衍射仪、扫描电镜和超导量子干涉仪对不同磁感应强度下制备粉体的物相、形貌和磁性能进行了表征。结果表明:交变磁场可以促进自蔓延反应的燃烧过程,但并不改变燃烧产物的相结构。随磁感应强度增加,Mn0.6Zn0.4Fe2O4粉体的粒径和矫顽力逐渐减小,饱和磁化强度逐渐增加。当磁感应强度为0.25T时,相比未加入交变磁场制备的粉体,Mn0.6Zn0.4Fe2O4粉体的矫顽力下降96%,达到278.6A/m,饱和磁化强度提高了500%,达到49.4A·m/kg。
Mn0.6Zn0.4Fe2O4 nanopowders were prepared by sol-gel self-propagating method with alternating magnetic field. The phase and morphology of the powders prepared under different magnetic induction intensities were characterized by X-ray diffraction, scanning electron microscopy and superconducting quantum interference And magnetic properties were characterized. The results show that the alternating magnetic field can promote the combustion process of self-propagating reaction, but does not change the phase structure of combustion products. With the increase of magnetic induction, the grain size and coercivity of Mn0.6Zn0.4Fe2O4 powder decrease gradually, and the saturation magnetization increases gradually. When the magnetic induction intensity is 0.25T, the coercivity of Mn0.6Zn0.4Fe2O4 powder decreases by 96% to 278.6A / m and the saturation magnetization increases by 500% compared with the powder without the addition of alternating magnetic field 49.4A · m / kg.