EXAFS study of dopant segregation (Zn, Nb) in nanocrystalline anatase (TiO2)

Chadwick, Alan V. and Knauth, P. and Weibel, A. and Mountjoy, Gavin and Bouchet, R. (2003) EXAFS study of dopant segregation (Zn, Nb) in nanocrystalline anatase (TiO2). Chemistry of Materials, 15 (26). pp. 4996-5002. ISSN 0897-4756. (Access to this publication is restricted)

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Abstract

Segregation of an acceptor (Zn) and a donor dopant (Nb) in nanocrystalline anatase was studied by EXAFS spectroscopy. Different dopant concentrations between 0.1 and 1 at. % were investigated, and similar results were found for nanocrystalline powders and nanocrystalline ceramics made by hot-pressing the powders. Niobium did not segregate whatever the concentration, whereas zinc segregation was found above 0.1 at. %. These results can be interpreted based on defect thermodynamics, in the framework of a space charge segregation model.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Alan Chadwick
Date Deposited: 15 Sep 2008 12:49
Last Modified: 16 Apr 2014 13:17
Resource URI: http://kar.kent.ac.uk/id/eprint/9379 (The current URI for this page, for reference purposes)
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