Nano Archive

Decomposition of Fe5C2 catalyst particles in carbon nanofibers during TEM observation

Blank, Vladimir D and Kulnitskiy, Boris A and Perezhogin, Igor A and Alshevskiy, Yuriy L and Kazennov, Nikita V (2009) Decomposition of Fe5C2 catalyst particles in carbon nanofibers during TEM observation. Science and Technology of Advanced Materials, 10 (1). 015004 (5pp).

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Official URL: http://stacks.iop.org/1468-6996/10/015004

Abstract

The effect of an electron beam on nanoparticles of two Fe carbide catalysts inside a carbon nanofiber was investigated in a transmission electron microscope. Electron beam exposure does not result in significant changes for cementite (th-Fe3C). However, for Hagg carbide nanoparticles (kh-Fe5C2), explosive decay is observed after exposure for 5-10 s. This produces small particles of cementite and g-Fe, each covered with a multilayer carbon shell, and significantly modifies the carbon-fiber structure. It is considered that the decomposition of Hagg carbide is mostly due to the damage induced by high-energy electron collisions with the crystal lattice, accompanied by the heating of the particle and by mechanical stress provided by the carbon layers of the nanofiber.

Item Type:Article
ID Code:5151
Deposited By:Prof. Alexey Ivanov
Deposited On:05 Aug 2009 08:56
Last Modified:06 Aug 2009 11:31

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