Preparation and size-dependent magnetism of highly dispersed iron silicide nanoparticles on silica

被引：15

作者：

Guan, Jingchao ^{[1
]}

Chen, Xiao ^{[1
]}

Yang, Kaixuan ^{[1
]}

Rykov, Alexandre ^{[2
]}

Wang, Junhu ^{[2
]}

Liang, Changhai ^{[1
]}

机构：

[1] Dalian Univ Technol, Sch Chem Engn, Lab Adv Mat & Catalyt Engn, Dalian 116024, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, Mossbauer Effect Data Ctr, Dalian 116024, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2014年 / 2卷 / 27期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

THIN-FILMS; FE3SI; PARTICLES; NANOWIRES; FE5SI3; INTERMETALLICS; TEMPERATURE; DEPOSITION; PYROLYSIS; TRANSPORT;

D O I：

10.1039/c4tc00676c

中图分类号：

T [工业技术];

学科分类号：

08 ;

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.

引用

页码：5292 / 5298

页数：7

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