Issue 27, 2014

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

Abstract

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 °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 °C. 57Fe Mössbauer spectra, M − H curves and FC and ZFC curves demonstrated that the as-prepared nanoparticles presented superparamagnetic behavior at 27 °C and ferromagnetic behavior at −268 °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.

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

Supplementary files

Article information

Article type
Paper
Submitted
03 Apr 2014
Accepted
08 May 2014
First published
09 May 2014

J. Mater. Chem. C, 2014,2, 5292-5298

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

J. Guan, X. Chen, K. Yang, A. Rykov, J. Wang and C. Liang, J. Mater. Chem. C, 2014, 2, 5292 DOI: 10.1039/C4TC00676C

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