纳米数量级的过渡金属合金粉体在磁记录材料和催化剂训的应用方面具有重要意义,采用价廉且方便的合成方法是制备过渡金属合金超细粉体臻于应用的关键环节.目前所采用的制备过渡金属合金粉体的方法大致可分为高温物理方法和化学还原法,其中用高温物理方法合成的粉体常因表面不可避免的氧化钝化而影响活性,而用化学还原法制备超细粉体大多采用均相方法,很少采用多相反应,以避免由于溶液介质中的固相质点成为晶核而影响超细颗粒的生成.
The 11.3 nm diameter nanopowders of Ni dominated Ni(Fe) solid solution can be prepared by using aluminum powder to react with FeSO4·(NH4)2SO4 and NiSO4·(NH4)SO4 mixed solution. In the product, the Fe atoms replaced parts of the Ni atoms. While the mass fraction of Ni^2+/(Fe^2++Ni^2+) in the solution is higher than 76%, solid solution of homogenous phase Ni(Fe) can be obtained. If the content of Ni^2+/(Fe^2++Ni^2+) lower than this point, the Ni(Fe) + Fe or Fe + Ni0.36Fe0.64 mixed phase nanopowders will be produced.