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发布时间：2019-03-09

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：Scopus、EI、SCIE

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.