Structural Characterisation study of FeCo alloy nanoparticles in a highly porous aerogel silica matrix

Carta, Daniela and Mountjoy, Gavin and Gass, Mhairi H. and Navarra, Gabriele and Casula, Maria Francesca and Corrias, Anna (2007) Structural Characterisation study of FeCo alloy nanoparticles in a highly porous aerogel silica matrix. Journal of Chemical Physics, 127 (20). Article Number 204705. ISSN 0021-9606. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1063/1.2799995

Abstract

A series of FeCo-SiO2 nanocomposite aerogels having different FeCo loadings of 3, 5, and 8 wt % were prepared using a novel urea-assisted sol-gel route. The size of the nanoparticles, which was estimated using Scherrer analysis of the main peak of the x-ray diffraction pattern, varies from 3 to 8 nm. X-ray absorption fine structure (EXAFS) and x-ray absorption near edge structure (XANES) techniques at both Fe and Co K edges were used to investigate the structure of the FeCo nanoparticles. EXAFS and XANES show that FeCo nanoparticles have the typical bcc structure. Evidence of oxidation was observed in low FeCo content aerogels. Spatially resolved electron energy loss spectroscopy analysis suggests the formation of a passivation layer of predominantly iron oxide.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: Gavin Mountjoy
Date Deposited: 03 Jul 2008 13:47
Last Modified: 15 Jul 2014 13:44
Resource URI: http://kar.kent.ac.uk/id/eprint/9919 (The current URI for this page, for reference purposes)
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