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Mössbauer spectroscopy study of MgAl2O4-matrix nanocomposite powders containing carbon nanotubes and iron-based nanoparticles

Coquay, Pierre and De Grave, Eddy and Vandenberghe, Robert E. and Dauwe, Charles and Flahaut, Emmanuel and Laurent, Christophe and Peigney, Alain and Rousset, Abel Mössbauer spectroscopy study of MgAl2O4-matrix nanocomposite powders containing carbon nanotubes and iron-based nanoparticles. (2000) Acta Materialia, 48 (11). 3015-3023. ISSN 1359-6454

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Official URL: http://dx.doi.org/10.1016/S1359-6454(00)00063-X

Abstract

Materials involved in the catalytic formation of carbon nanotubes are for the first time systematically studied by Mössbauer spectroscopy between 11 K and room temperature. Mg1−xFexAl2O4 (x=0.1, 0.2, 0.3, 0.4) solid solutions are transformed into carbon nanotubes–Fe/Fe3C–MgAl2O4 composite powders by reduction in a H2–CH4 gas mixture. The oxides are defective spinels of general formulae (Mg1−x2+Fex−3α2+Fe2α3+□αAl23+)O42−. Ferromagnetic α-Fe, ferromagnetic Fe3C and a γ-Fe form, the latter possibly corresponding to a γ-Fe–C alloy, are detected in the composite powders. An attempt is made to correlate these results with the microstructure of the powder. It seems that the nanoparticles, which catalyze the formation of the carbon nanotubes, are detected as Fe3C in the post-reaction Mössbauer spectroscopy analysis.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Acta Materialia website : http://dx.doi.org/10.1016/S1359-6454(00)00063-X
HAL Id:hal-00980086
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universiteit Gent - UGENT (BELGIUM)
Laboratory name:
Funders:
National Programme of Inter-University Attraction Pole on Reduced Dimensionality Systems (PAI - IUAP P4/10)Fund for Scientific Research - Flanders
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Deposited By: cirimat webmestre
Deposited On:21 Jan 2014 13:08

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