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Surface enhancement of oxygen exchange and diffusion in the ionic conductor La2Mo2O9

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Liu, J., Chater, R. J., Hagenhoff, B., Morris, R. J. H. (Richard J. H.) and Skinner, S. J.. (2010) Surface enhancement of oxygen exchange and diffusion in the ionic conductor La2Mo2O9. Solid State Ionics, Vol.181 (No..17-18). pp. 812-818. ISSN 0167-2738

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Official URL: http://dx.doi.org/10.1016/j.ssi.2010.04.009

Abstract

Isotopic surface oxygen exchange and its subsequent diffusion have been measured using secondary ion mass spectrometry in the fast ionic conductor La2Mo2O9. A silver coating was applied to the sample surface to enhance the surface exchange process for dry oxygen. Contrary to previous studies performed using a wet atmosphere, no grain boundary diffusion tail was observed under these optimized dry exchange conditions. The activation energy for oxygen diffusion was found to be 0.66(+/- 0.09) eV at high temperature (>570 degrees C), and 1.25(+/- 0.01)eV at low temperature (<570 degrees C). Time-of-Flight secondary ion mass spectrometry was employed to investigate the correlation between the silver coating and the O-18 concentration on the sample surface. A close correlation between the presence of silver and oxygen incorporation on the surface was observed. (C) 2010 Elsevier B.V. All rights reserved.

Item Type:

Journal Article

Subjects:

Q Science > QD Chemistry
Q Science > QC Physics

Divisions:

Faculty of Science > Physics

Journal or Publication Title:

Solid State Ionics

Publisher:

Elsevier Science BV

ISSN:

0167-2738