中文摘要：

通过溶胶-凝胶自蔓延燃烧法制备了系列纳米尖晶石材料AFe_2O_4（A=Cu、Co、Ni、Mg、Zn）,采用DTA、XRD、FT-IR、BET、SEM、TEM、XPS等技术对样品进行了表征,着重研究不同A位元素对尖晶石材料的影响。结果表明,200℃时,AFe_2O_4干凝胶发生自蔓延燃烧;500℃时,尖晶石结构形成,有明显的正四面体和正六面体亚晶格出现,晶格尺寸在40nm左右,均呈纳米结构;其中CuFe_2O_4为反式尖晶石结构,Fe、Cu、O所占比例分别为42%,39%,19%。BET、TEM及SEM结果发现该方法制备的尖晶石材料呈明显的片状介孔结构,比表面积在20m~2/g左右,层状结构之间距离15nm。A位上元素不同,制备过程中自蔓延温度不同,孔结构和微观结构有较大差异。

英文摘要：

A series of nano spinels AFe_2O_4（A=Cu,Co,Ni,Mg,Zn）were synthesized through sol-gel autocombustion method.The study was focused on the influence of the different elements of A bit on the spinel materials.The prepared samples were characterized by DTA,XRD,FT-IR,BET,SEM,TEM and XPS techniques.The results showed that the dried gel of AFe_2O_4 auto-burned at 200℃.And the spinel structures which were constituted by the tetrahedron and hexahedron sublattices formed at 500 ℃.It was found that the lattices with size of around 40 nm were typical nano structures.Especially,the proportions of Fe,Cu,O in the trans spinel material CuFe_2O_4 were 42%,39% and 19%.BET,TEM and SEM results showed the spinel materials had obvious lamellar mesoporous structures with specific surface areas of around 20 m~2/g.With different elements in A bit,the dried gel of AFe_2O_4 auto-burned at different temperature,and the pore structures and microstructures had great difference.