|
个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 大连理工大学成都研究院院长
性别：男
毕业院校：中科院大连化学物理研究所
学位：博士
所在单位：化工学院
学科：化学工艺. 物理化学. 功能材料化学与化工
办公地点：大连理工大学西部校区化工综合楼A401室
联系方式：辽宁省大连市高新区凌工路2号，邮编116024
电子邮箱：changhai@dlut.edu.cn
Preparation and size-dependent magnetism of highly dispersed iron silicide nanoparticles on silica
点击次数：
论文类型：期刊论文
发表时间：2014-07-21
发表刊物：JOURNAL OF MATERIALS CHEMISTRY C
收录刊物：SCIE、EI、Scopus
卷号：2
期号：27
页面范围：5292-5298
ISSN号：2050-7526
摘要：Fe3Si nanoparticles with a size of about 6-9 nm well dispersed on silica have been prepared by pyrolysis of ferrocene-polydimethylsilane composites at 600 degrees C. Powder XRD patterns, TEM and HRTEM images, and XPS spectra revealed that the average particle size increased with increasing pyrolysis temperature and a new phase, Fe5Si3, appeared when the pyrolysis temperature was above 800 degrees C. Fe-57 Mossbauer spectra, M - H curves and FC and ZFC curves demonstrated that the as-prepared nanoparticles presented superparamagnetic behavior at 27 degrees C and ferromagnetic behavior at -268 degrees C, and their particle sizes had a great impact on their magnetic properties. The Fe3Si nanoparticles on silica may find applications in magnetically recording materials, magnetically separable catalysts and electrode materials for spintronic devices.