极性有机溶剂对镍颗粒晶型的影响  

Effect of Polar Organic Solvent on the Crystal Phase of Nickel Particle

作　　者：米远祝[1,2] 颜学敏[1] 但悠梦[2] 胡卫兵[2] 

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023 [2]湖北民族学院化学与环境工程学院,湖北恩施445000

出　　处：《磁性材料及器件》2009年第2期10-13,44,共5页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(20871044);湖北省教育厅项目(Q20081209;B200729001)

摘　　要：以乙醇等有机溶剂作为溶剂和还原剂,在不锈钢反应釜中于不同的反应温度还原Ni(Ac)2·4H2O制备了金属镍粉。X射线衍射分析(XRD)结果显示,极性大的有机溶剂能诱导六方紧密堆集(hcp)镍的生成,当溶剂的极性大于4.3时,在250～280℃左右的温度下有六方镍的生成;而当溶剂的极性小于4.3时,在200～400℃范围内反应生成的镍粉均为面心立方(fcc)结构。利用同种溶剂制备的镍样品,为六方和立方两相的混合物时,样品的饱和磁化强度、剩磁相对较小,而矫顽力相对较大。Nickel powders with different crystal structure were obtained by chemical reduction of Ni（Ac）2·4H2O using organic solvent as solvent and reducing agent in a stainless steel autoclave. The products were characterized by X-ray diffraction （XRD）. XRD results show that hexagonal close-packed （hcp） Ni could be induced by organic solvents with high polarity. The hcp Ni was produced in the as-prepared sample at reaction temperature of 250-280℃ when the polarity of organic solvent is above 4.3. Only face-centered cubic （fcc） phase nickel was obtained at reaction temperature of 200-400℃ when the polarity of solvent is under 4.3. To the as-prepared sample synthesized with the same solvent, the mixture of fee and hcp has relatively low saturation magnetization and remanent magnetization, but the coercivity is high.

关 键 词：溶剂热法 有机溶剂 镍 晶型转变 

分 类 号：TM274[一般工业技术—材料科学与工程]