【作者】 方海燕； 程继贵； 杨俊芳； 李健； 蒋秋妹；

【Author】 FANG Hai-yan,CHENG Ji-gui,YANG Jun-fangJANG Qiu-mei (School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

【机构】 合肥工业大学材料科学与工程学院；

【摘要】 采用不同的柠檬酸与金属离子摩尔比（MRCM=1.0,1.5,2.0）,通过柠檬酸燃烧法制备了NiO/Ce_0.8Sm_0.2O_1.9（简称NiO/SDC）粉体。采用X射线衍射仪（XRD）、透射电子显微镜（TEM）、激光衍射粒度仪等对所得粉体的相组成和形貌等进行了测试,考察了在溶液中添加不同分散剂对所制备NiO/SDC粉体的比表面积和粒径的影响。实验结果表明,前躯体溶液中柠檬酸与金属离子摩尔比（MRCM）对燃烧后NiO/SDC粉体的粒度、比表面积等都有明显地影响。其中,MRCM=1.5时,NiO/SDC粉体中NiO与SDC晶体的粒度最大,分别为10.42、6.91nm,而对应粉体的分散性好,比表面积大,表面积平均径最小。此外,通过在前躯体溶液中添加不同的分散剂可改善燃烧后NiO/SDC粉体的粒度和粒度分布,其中以聚乙二醇6000对NiO/SDC粉体的分散效果最好。更多还原

【Abstract】 NiO/Ce_0.8Sm_0.2O_1.9（NiO/SDC） powders were prepared by a citric acid-nitrate combustion method with different mole ratios of citric acid to metal ions（MRCM） in the precursor solutions.Phase composition and morphology of the powders were investigated by XRD,TEM and laser diffraction analysis et al.Specific surface area and average particle size of the NiO/SDC powders with different dispersants in the precursor solutions were also measured by a BET method.The results show that the MRCM has a significant effect on the particle size of the obtained NiO/SDC powders.The average crystallite size of NiO and SDC are 10.42 and 6.91 nm,respectively,in the NiO/SDC powders for a MRCM of 1.5,the powders show good dispersion with a high surface area and small particle size.The adding of dispersants into the precursor solutions can effectively reduce the aggregation of the NiO/SDC powders.Especially,PEG6000 shows best dispersion effect for the NiO/SDC powders.更多还原