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

被引：35

作者：

Coquay, P

De Grave, E

Vandenberghe, RE

Dauwe, C

Flahaut, E

Laurent, C

Peigney, A

Rousset, A

机构：

[1] State Univ Ghent, NUMAT, Dept Subatom & Radiat Phys, B-9000 Ghent, Belgium

[2] Univ Toulouse 3, CIRIMAT, UMR CNRS 5085, Lab Chim Mat Inorgan, F-31062 Toulouse 4, France

来源：

ACTA MATERIALIA | 2000年 / 48卷 / 11期

关键词：

carbon nanotubes; iron; carbides; Mossbauer effect;

D O I：

10.1016/S1359-6454(00)00063-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Materials involved in the catalytic formation of carbon nanotubes are for the first time systematically studied by Mossbauer 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 H-2-CH4 gas mixture. The oxides are defective spinels of general formulae (Mg(1-x)(2+)Fe(x-3 alpha)(2+)Fe(x-3 alpha)(2+)Fe(2 alpha)(3+)rectangle(alpha)Al(2)(3+))O-4(2-). Ferromagnetic alpha-Fe, ferromagnetic Fe3C and a gamma-Fe form, the latter possibly corresponding to a gamma-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 Mossbauer spectroscopy analysis. (C) 2000 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

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页码：3015 / 3023

页数：9

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