Structure and phase composition of a catalyst for carbon nanofiber formation

Novel carbon nanofibers (CNFs) consisting of graphite layers crossed by two systems of stripes are formed on an iron catalyst using the chemical vapor deposition method under conditions close to the phase equilibrium of the iron carbides Fe 3C and Fe 5C 2. The formation of these CNFs is explained by...

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Bibliographic Details
Published in:Scripta materialia 2006-12, Vol.55 (11), p.1035-1038
Main Authors: Blank, V.D., Alshevskiy, Yu.L., Zaitsev, A.I., Kazennov, N.V., Perezhogin, I.A., Kulnitskiy, B.A.
Format: Article
Language:English
Subjects:
Carbides
Carbon
Carbon fibers
Catalysts
Decay
Graphite
High resolution electron microscopy (HREM)
Iron
Nanofibers
Transformations
Twinning
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Summary:Novel carbon nanofibers (CNFs) consisting of graphite layers crossed by two systems of stripes are formed on an iron catalyst using the chemical vapor deposition method under conditions close to the phase equilibrium of the iron carbides Fe 3C and Fe 5C 2. The formation of these CNFs is explained by the deformation caused by the decay of the carbides. It is shown that the catalyst particle, often twinned, consists of Fe 3C, Fe 5C 2 or both. The crystallographic peculiarities of α-Fe → Fe 3C → Fe 5C 2 transformation are discussed.
ISSN:1359-6462
0956-716X
1872-8456
DOI:10.1016/j.scriptamat.2006.08.007