用改进的Pechini法制备了高度分散的泡沫凝胶颗粒,然后分别在500,650,800℃进行热分解得到了镍铁氧体纳米颗粒;用XRD、TEM、IR及VSM等对其形貌、结构和磁性能进行了分析。结果表明：用改进Pechini法得到的镍铁氧体纳米颗粒分散性好,尺寸均匀,晶化程度高,纯度高;500℃热解后得到的镍铁氧体粒径为50～120nm;室温下在796kA.m-1磁场下的饱和磁化强度可达13.03kA.m-1;随着热解温度的升高,镍铁氧体纳米颗粒的直径、饱和磁化强度、矫顽力都增大。
Nickel ferrite nano-particles were obtained by decomposing high-dispersed foamed gel prepared by improved Pechini method at 500,650 and 800 ℃,respectively.The morphology,structure,and magnetic characteristics of the nano-particles were analyzed by X-ray diffraction,transmission electron microscopy,infrared and vibrating sample magnetometer.The results show that nickel ferrite nano-particles obtained by improved Pechini method exhibited dispersibility,uniform distribution,high crystallinity and purity.The diameter of nickel ferrite nano-particles decomposed at 500 ℃ was 50-120 nm;its saturation magnetization was 13.03 kA·m-1 at the maximum magnetic field of 796 kA·m-1 at room temperature.With the increase of thermol decomposition temperature,the paprticle size,saturation magnetization and coercivity of nickel ferrite nano-particles increased.
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