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X-ray absorption investigation of the formation of cobalt ferrite nanoparticles in an aerogel silica matrix

Carta, Daniela, Mountjoy, G, Navarra, G, Casula, MF, Loche, D, Marras, S and Corrias, A (2007) X-ray absorption investigation of the formation of cobalt ferrite nanoparticles in an aerogel silica matrix Journal of Physical Chemistry C, 111 (17). pp. 6308-6317.

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Abstract

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 formation of CoFe2O4 nanoparticles embedded in a silica aerogel matrix as a function of calcination temperature and CoFe2O4 content. In particular, nanocomposite aerogels containing relative CoFe2O4 amounts of 5 and 10 wt % and calcined at 450, 750, and 900 °C were studied. The evolution of the nanophase with calcination temperatures depends on the composition. In the sample containing 10 wt % of nanophase, results indicate that CoFe2O4 nanocrystals were formed after calcination at 750 °C, whereas in the sample containing 5 wt % of nanophase, they were obtained only after calcination at 900 °C. Quantitative determination of the distribution of the iron and cobalt phase in the octahedral and tetrahedral sites of the spinel structure shows that cobalt ferrite prepared by sol−gel has a partially inverted spinel structure with a degree of inversion around 0.70.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Carta, Danielad.carta@surrey.ac.ukUNSPECIFIED
Mountjoy, GUNSPECIFIEDUNSPECIFIED
Navarra, GUNSPECIFIEDUNSPECIFIED
Casula, MFUNSPECIFIEDUNSPECIFIED
Loche, DUNSPECIFIEDUNSPECIFIED
Marras, SUNSPECIFIEDUNSPECIFIED
Corrias, AUNSPECIFIEDUNSPECIFIED
Date : 6 April 2007
Identification Number : 10.1021/jp0708805
Copyright Disclaimer : Copyright © 2007 American Chemical Society
Depositing User : Jane Hindle
Date Deposited : 04 Sep 2017 07:57
Last Modified : 04 Sep 2017 07:57
URI: http://epubs.surrey.ac.uk/id/eprint/842135

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