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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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纳米γ-fe2o3的合成及气敏性能
Keywords: 溶胶-凝胶法,硅酸乙酯,γ-fe2o3纳米晶
Abstract:
？硝酸铁乙二醇甲醚溶液体系中加入硅酸乙酯,用溶胶-凝胶法制备γ-fe2o3纳米晶粉体.硅酸乙酯的加入不但加速凝胶化过程,而且有效抑制氧化铁晶粒的生长,提高γ-fe2o3向α-fe2o3转变的相变温度.tg-dta热分析结果表明这个相变温度为700℃左右.改变硅酸乙酯的加入量可制备出具有不同晶相的粉体;tem观测表明粉体的粒径约为10nm.γ-fe2o3纳米晶粉体的气敏特性具有迅速的响应-恢复性能,掺入少量zn可改善气敏特性.
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