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SiO₂基底中MnFe₂O₄纳米晶的制备与表征

Preparation and characterization of MnFe₂O₄ nanocrystalline dispersed in a silica matrix

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【Author】 XU Li1,2*,ZOU Wen-qin 3,HONG Jian-min 4,CHI Xing-wei1,ZAI De-xin1(1.College of Science,Nanjing Forestry University,Nanjing 210037,China;2.State Key Laboratory of Coordination Chemistry,Nanjing University,Nanjing 210093,China;3.Physics Department and State Key Laboratory of Solid State Microstructure,Nanjing University,Nanjing 210093,China;4.Analytic Center of Nanjing University,Nanjing 210093,China)

【机构】南京林业大学理学院；南京大学配位化学国家重点实验室；南京大学物理系固态微结构国家重点实验室；南京大学分析测试中心；

【摘要】在N,N-二甲基甲酰胺(DMF)存在下,以溶胶-凝胶技术成功地制备了无定形二氧化硅基底中均匀分布的MnFe2O4纳米晶。由粉末X射线衍射和电子衍射确证了MnFe2O4纯相的生成。由粉末X射线衍射和红外吸收光谱研究了MnFe2O4纳米晶形成过程。尖晶石结构的MnFe2O4在800℃时开始形成,900℃时基本完成。磁性质测量表明在烧结到900℃的样品中,MnFe2O4纳米晶室温具有超顺磁性,78K时为软磁性。1000℃和1100℃下得到的样品室温和78K时都具有软磁性。更多还原

【Abstract】 Uniformly dispersed MnFe2O4 nanocrystals were successfully synthesized in an amorphous silica matrix by the sol-gel method in the presence of N,N-dimethylformamide(DMF).The formation of pure MnFe2O4 was confirmed by powder X-ray diffraction(XRD)and electron diffraction.The structural development of MnFe2O4 nanocrystals was followed by powder X-ray diffraction and IR absorption spectroscopy.The formation of spinel structure of MnFe2O4 started at 800℃,and completed at 900℃.Field-dependent magnetization measurements at room temperature indicated superparamagnetic nature of MnFe2O4 nanocrystals in N-900.N-900 at 78K and N-1000 and N-1100 both at room temperature and 78K exhibited soft magnetic behavior.更多还原