(上海大学 材料科学与工程学院，
上海市现代冶金与材料制备重点实验室， 上海 200072)
摘 要: 在共沉淀制备非铁磁性锰锌铁氧体前驱体纳米颗粒的过程中， 分别施加零磁场、 弱磁场（0.1～0.7 T）和强磁场(10 T)，探讨磁场对非铁磁性锰锌铁氧体前驱体纳米颗粒形貌的影响规律。 结果表明， 当磁感应强度超过某一临界值时， 非铁磁性纳米颗粒由球形颗粒向链状颗粒， 然后向棒状或者纤维状颗粒转变。在10 T的强磁场下， 纳米颗粒长成长径比很大的纤维状， 能谱分析结果表明， 纤维状颗粒主要为复合铁氧体， 而非单一的沉淀产物。随着反应温度增加、 溶液滴加时间延长将使纤维直径降低。
关键字: 强磁场； 非铁磁性纳米颗粒； 形貌； 共沉淀
MnZn ferrite nano-precursor particles
（ Shanghai Enhanced Laboratory of Modern Metallurgy and Material Processing,
School of Materials Science and Engineering, Shanghai University 200072, China）
Abstract: The preparations of non-magnetism nano-precursor particles of MnZn ferrite were carried out in the zero magnetic field, weak magnetic field and high static magnetic field, respectively, and the effect of the magnetic field on the shape of the nano-particles was discussed. The results show that, there is a critical magnetic flux density (MFD), above which the shape of the nano-particles changes from spheric to chainlike, then to fibre-like. In the magnetic field with MFD equaling to 10 T, the nano-particles have the shape of fibre with high ratio between length and diameter; and the composition of the fibre is mainly ferrite compound, not single oxide, which was judged from analysis results by energy spectrum. The diameter of the fibre decreases when the reaction temperature is increased or the adding time of reagent solution is prolonged.
Key words: high static magnetic field; non-magnetism nano-particles; shape; co-precipitation
