【摘要】 在聚乙二醇 ( PEG-40 0 )存在下 ,于室温下研磨适量 Fe Cl3与 Na OH的混合物制备了γ-Fe2 O3纳米粒子 .所得各样品用 XRD,Mossbauer谱 ,TEM,TG-DTA和 FTIR等手段进行了表征 .结果表明 ,研磨后的样品经 60℃干燥 2 h后即可得结晶较差的 γ-Fe2 O3纳米粉体 ,经 45 0℃热处理 1 h后得粒径约为 3 0 nm结晶较好的γ-Fe2 O3纳米粒子 ,经 5 0 0℃热处理 1 h后得到粒径约为 40 nm、结晶完好的γ-Fe2 O3纳米粒子更多还原

【Abstract】 In this paper, a new method to prepare γ Fe 2O 3 nanoparticles was described. In the presence of polyethylene glycol(PEG 400), the mixture of FeCl 3·6H 2O and NaOH was ground and the γ Fe 2O 3 nanoparticles were prepared. The product obtained was washed and dried at 60 ℃ and calcined at different temperatures for 1 h. XRD, Mssbauer Spectroscopy, TEM, TG DTA and FTIR were used to characterize the samples. The results show that after dried at 60 ℃ for 2 h, the as ground sample was transformed into poor crystalline γ Fe 2O 3 ultrafine powder. After being calcined at 450 ℃ for 1 h, the ultrafine powder became good crystalline γ Fe 2O 3 nanoparticles with particle size of 30 nm. After being calcined at 500 ℃ for 1 h, perfect crystalline γ Fe 2O 3 nanoparticles were gotten with a particle size of 40 nm.更多还原