【摘要】 以乙酸镍、氢氧化铁和草酸为原料,用流变相反应法制备出前驱物,在不同温度下煅烧得到纳米镍铁氧体粉末。采用差热(TG-DSC)、X射线衍射(XRD)及透射电镜(TEM)对煅烧过程和产物进行了分析。结果表明,用流变相反应法制备的前驱物,在300℃煅烧即可直接形成纯相的尖晶石结构的镍铁氧体粉末。粉末呈方块状,平均颗粒大小约30 nm,分布均匀,分散性较好。相对其他方法,其煅烧温度低,可以克服因高温煅烧引起的颗粒增大和团聚的缺陷。更多还原

【Abstract】 Nickel ferrite nano-powders were successfully prepared by calcining the precursors at different temperatures,which were synthesized from Ni(CH3COO)2·4H2O,Fe(OH)3 and H2C2O4·2H2O by rheological phase reaction.Decomposition temperatures,structures and sizes of the samples were characterized by TG-DSC,XRD and TEM techniques.The results show that the precursors are directly transformed into the pure spinel nickel ferrite nano-powders at 300 ℃.The powders are square-shaped fine dispersion with an average particle size of 30 nm.The lower calcination temperature compared with other methods can avoid growing and reuniting of powders at high temperature.更多还原