【摘要】 研究了在硝酸铁 -乙二醇甲醚体系中用溶胶 -凝胶法制备氧化铁纳米晶 .利用 TEM、XRD和 TG- DTA手段对产物进行了表征。结果表明 ,体系中加入十二烷基磺酸钠有助于纯相α- Fe2 O3纳米晶的生成 ,而加入钛酸四丁酯则显著缩短凝胶时间 ,所得粉体的原始晶粒尺寸为 30 nm左右 .若加入硅酸乙酯替代钛酸四丁酯 ,则最终产物为 γ氧化铁和 α氧化铁的混晶相 ( γ- Fe2 O3为主晶相 ) ,晶粒尺寸约 10 nm .更多还原

【Abstract】 The nanocrystal α-Fe 2O 3 with an average size of about 30 nm was prepared by a sol-gel method in iron nitrate and 2-methoxyethanol solution. The product was characterized by TEM, XRD and TG-DTA. The results showed that addition of sodium dodecylsulfonate(SDS) into the system favourd the formation of α-Fe 2O 3 phase and the gelation time was reduced greatly by adding tetrabutyl titanate in solution. By using TESi instead of TBTi, the product is a mixture of spinel γ-Fe 2O 3 and α-Fe 2O 3, with the former as a main crystal phase.更多还原