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Synthesis and characteristics of iron nanoparticles in a carbon matrix along with the catalytic graphitization of amorphous carbon

Sajitha, EP and Prasad, V and Subramanyam, SV and Eto, S and Takai, Kazuyuki and Enoki, T (2004) Synthesis and characteristics of iron nanoparticles in a carbon matrix along with the catalytic graphitization of amorphous carbon. In: CARBON, 42 (14). pp. 2815-2820.

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Abstract

Iron nanoparticles in a carbon matrix were synthesized by in situpyrolysis of maleic anhydride and ferrocene, using different molecular weight percentages. The characterization and magnetic properties of the carbon-iron system were investigated systematically. Transmission electron microscope (TEM) images showed that the as-prepared samples consist of nanometric dark grains (iron-rich phase) embedded in a light matrix (carbon-rich phase). X-ray diffraction and TEM selected area diffraction revealed catalytic graphitization and iron phases presentin the sample. The carbon-metal system shows a finite hysteresis loop even at room temperature indicating its ferromagnetic nature. The saturation magnetization equals the bulk iron carbide value at low temperature. The coercive force exhibits 1/d dependence at low temperature having a maximum H-C of 2 kOe for the lowest iron concentration sample.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier.
Keywords: Pyrolytic carbon;Chemical vapour deposition;X-ray diffraction,Transmission electron microscopy;Magnetic properties
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 26 Nov 2007
Last Modified: 19 Sep 2010 04:18
URI: http://eprints.iisc.ernet.in/id/eprint/2827

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