以无水乙醇作为溶剂和还原剂,在不锈钢反应釜中于不同的反应温度还原Ni(Ac)2.4H2O制备金属镍粉.X射线衍射分析(XRD)结果显示,当反应温度小于230℃,大于300℃时,产物为单相的面心立方晶镍,而温度在250-280℃时,产物为面心立方和六方镍的混合物.扫描电镜(SEM)和透射电镜(TEM)结果显示,在不同的温度条件下,产物分别有不规则微球、孔状微球以及多面体结构等不同的形貌出现.当温度为250℃时,样品为单一的不规则团聚微球,当温度为300℃时,样品为微球、孔状微球和多面体的混合物.当温度为400℃时,产物为表面光滑形状规则的多面体结构,多面体直径约为1-2μm.测定了不同样品的磁性能,当样品为六方和面心立方两相混合物时,样品的磁矫顽力相对较大,而饱和磁化强度和剩磁相对较小.
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