制备方法对纳米氧化铁晶型的影响

Effect of Synthesis Method on Crystal Phase of Iron Oxide Nanocrystalline Powders

分别采用沉淀法、硬脂酸法、聚乙二醇法、柠檬酸法和柠檬酸铁快速燃烧法制备纳米氧化铁晶体 ,研究了这 5种制备方法对粉体晶型、平均粒径、磁性、分散性的影响。结果表明 ,沉淀法制得粒径为 8.5 nm的α- Fe2 O3 ,柠檬酸铁快速燃烧获得的是 Fe3 O4的纳米晶 ,而采用 3种溶胶 -凝胶法制得的是α- Fe2 O3 与γ- Fe2 O3 的混合晶体。

Iron oxide Nanocrystalline Powders were prepared respectively by precipitation, stearic acid gel, polyethylene glycol gel, citrate gel and iron citrate combustion. The influence of synthesis method on the final product, such as the crystal structure, crystalline grain size, dispersivity were studied. XRD results show that the pure α Fe 2O 3, Fe 3O 4 were synthesized respectively by precipitation, ironic citrate combustion, and mixture of α Fe 2O 3 γ Fe 2O 3 were gained by Sol gol method.