Structure and magnetic properties of carbon encapsulated Fe nanoparticles obtained by arc plasma synthesis

Jolanta Borysiuk 1Agnieszka Grabias 1Jacek Szczytko 2Andrzej Twardowski 2Michał Bystrzejewski 3Hubert Lange 3

1. Institute of Electronic Materials Technology (ITME), Wólczyńska 133, Warszawa 01-919, Poland
2. Warsaw University, Faculty of Physics, Hoża 69, Warszawa 00-681, Poland
3. Warsaw University, Faculty of Chemistry, Pasteura 1, Warszawa 02-093, Poland

Abstract

Carbon encapsulated Fe nanoparticles were obtained using arc plasma synthesis. TEM (transmission electron microscopy) and Mössbauer spectroscopy showed that Fe particles consist of metallic and carbide phases encapsulated by graphitic carbon. The particles were of 10 –100 nm in diameter, and were covered by carbon layers 5-15 nm thick. The transmission Mössbauer spectra revealed two magnetic and two paramagnetic components, related to iron containing phases. It was shown that about 47% of iron atoms are located in the Fe3C phase. The remaining iron belongs to the bcc Fe and fcc Fe(C) phases. Magnetic measurements showed that saturation magnetization Ms was equal to 53 emu/g, which is about 25% of the saturation magnetization of bulk iron. The remnant to saturation magnetizations ratio was Mr/Ms ~ 0.15, showing that the carbon coated Fe nanoparticles are ferromagnetic.

 

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Presentation: Poster at Joint Fith International Conference on Solid State Crystals & Eighth Polish Conference on Crystal Growth, by Jolanta Borysiuk
See On-line Journal of Joint Fith International Conference on Solid State Crystals & Eighth Polish Conference on Crystal Growth

Submitted: 2007-01-24 17:14
Revised:   2009-06-07 00:44