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Complex diffusion behavior of oxygen in nanocrystalline BaTiO3 ceramics

De Souza, Roger A. and Voisin, Christophe and Schraknepper, Henning and Teusner, Markus and Kessel, Markus and Dufour, Pascal and Tenailleau, Christophe and Guillemet-Fritsch, Sophie Complex diffusion behavior of oxygen in nanocrystalline BaTiO3 ceramics. (2013) Physical Chemistry Chemical Physics, 16 (6). 2568-2575. ISSN 1463-9076

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Official URL: http://dx.doi.org/10.1039/c3cp53979b

Abstract

18O/16O exchange annealing and subsequent Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) analysis is used to investigate oxygen transport in dense, nanocrystalline (average grain size d E 300 nm) ceramics of nominally un-doped BaTiO3. Isotope penetration profiles are obtained as a function of temperature, 973 o T/K o 1173, at an oxygen activity aO2 = 0.20 and as a function of oxygen activity, 0.002 o aO2 o 0.20, at T = 1073 K. All isotope profiles show the same unusual shape: a flattened profile over the first B102 nm, followed by a short, conventional diffusion profile. We demonstrate that the entire isotope profile can be described quantitatively by a numerical solution to the diffusion equation based on an increase in the local oxygen diffusion coefficient close to the surface. This position-dependent increase is attributed to additional oxygen vacancies that are generated by diffusion of chlorine impurities out of the ceramics. The presence of chlorine derives from the chemical route necessary to produce nanometric powders: it thus indicates a new manner in which nanocrystalline ceramics may differ from their microcrystalline counterparts.

Item Type:Article
Additional Information:Thanks to Royal Society of Chemistry editor. The definitive version is available at http://pubs.rsc.org The original PDF of the article can be found at Royal Society of Chemistry website : http://pubs.rsc.org/en/Content/ArticleLanding/2014/CP/c3cp53979b#!divAbstract
HAL Id:hal-01168945
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Forschungszentrum Jülich GmbH (GERMANY)
Other partners > Rheinisch Westfaelische Technische Hochschule Aachen University - RWTH (GERMANY)
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Funders:
DGAC - University of Toulouse
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Deposited By: cirimat webmestre
Deposited On:26 Jun 2015 15:05

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