SiO2基底中MnFe2O4纳米晶的制备与表征  

Preparation and characterization of MnFe_2O_4 nanocrystalline dispersed in a silica matrix

作　　者：徐莉[1,2] 邹文琴[3] 洪健民[4] 池杏微[1] 宰德欣[1] 

机构地区：[1]南京林业大学理学院,江苏南京210037 [2]南京大学配位化学国家重点实验室,江苏南京210093 [3]南京大学物理系,固态微结构国家重点实验室,江苏南京210093 [4]南京大学分析测试中心,江苏南京210093

出　　处：《化学研究与应用》2009年第12期1601-1606,共6页Chemical Research and Application

基　　金：国家自然科学基金项目(30771676)资助;江苏省自然科学基金项目(BK20081842)资助

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。Uniformly dispersed MnFe2 04 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.

关 键 词：MnFe2O4纳米晶 溶胶-凝胶 DMF 磁性质 

分 类 号：O611.4[理学—无机化学]