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Structural and spectroscopic studies of iron (III) doped titania powders prepared by sol-gel synthesis and hydrothermal processing

Janes, R.; Knightley, L. J. and Harding, C. J. (2004). Structural and spectroscopic studies of iron (III) doped titania powders prepared by sol-gel synthesis and hydrothermal processing. Dyes and Pigments, 62(3) pp. 199–212.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1016/j.dyepig.2003.12.003
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Abstract

Iron-doped titania powders, of microfine dimensions and iron loadings of up to 5.64 wt.% were prepared by a sol-gel route. Gels, obtained by hydrolysis of titanium alkoxide in an aqueous solution of iron (II) chloride, were subjected to thermal treatment by heating in air or hydrothermal processing in an autoclave. The evolution of the crystalline component was determined by X-ray powder diffraction, and the local environment of the dopant was probed by electron spin resonance spectroscopy. Mössbauer spectroscopy was used to determine the oxidation state of the dopant. Over the iron-loading regime studied here, the anatase-rutile transition is inhibited at low dopant levels with respect to undoped titania. The effect becomes less pronounced as iron-loading is increased. Indeed the crystalline composition of the powders as a function of firing temperature is dependent not only on iron loading level but also on its dispersion within the titania matrix. This response is discussed in the context of the solution-based synthetic routes employed here.

Item Type: Journal Article
Copyright Holders: 2003 Elsevier Ltd.
ISSN: 0143-7208
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetThe Open University
Keywords: titania; calcination; hydrothermal; doping; spectrocopy
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Interdisciplinary Research Centre: Biomedical Research Network (BRN)
Item ID: 5450
Depositing User: Charlie Harding
Date Deposited: 26 Sep 2006
Last Modified: 10 Mar 2014 10:28
URI: http://oro.open.ac.uk/id/eprint/5450
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