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以FeSO4·7H2O,NiSO4·6H2O和NaOH为反应物,充分研磨后经微波辐射和常规热处理分别制得NiFe2O4纳米粉体。通过X射线衍射和扫描电镜分析了粉体的相结构和形貌,并分析了微波作用与NiFe2O4形成的关系。结果表明:在热处理过程中存在的Na2SO4熔盐作为模板使得NiFe2O4晶粒呈片状,而采用微波技术可以快速地获得粒径分布均匀的单相NiFe2O4纳米片晶。由于NiFe2O4是一种磁性介电材料,在低温下,其磁偶极子易与微波发生相互作用,从而可以有效地解决存在于常规低温固相反应中的热控问题。
FeSO4 · 7H2O, NiSO4 · 6H2O and NaOH as reactants, after full grinding, microwave irradiation and conventional heat treatment were prepared NiFe2O4 nano-powder. The phase structure and morphology of the powders were analyzed by X-ray diffraction and scanning electron microscopy. The relationship between microwave and NiFe2O4 formation was also analyzed. The results show that NiFe2O4 grains are flaky when the Na2SO4 molten salt is used as a template during the heat treatment, and the single-phase NiFe2O4 nanosheetlets with uniform particle size distribution can be rapidly obtained by microwave technology. Because NiFe2O4 is a kind of magnetic dielectric material, its magnetic dipole easily interacts with microwave at low temperature, so it can effectively solve the thermal control problem existing in conventional low temperature solid state reaction.