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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. doi:10.1016/j.ssi.2010.04.009

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

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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
Official Date: 17 June 2010
Dates:
DateEvent
17 June 2010Published
Volume: Vol.181
Number: No..17-18
Number of Pages: 7
Page Range: pp. 812-818
DOI: 10.1016/j.ssi.2010.04.009
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Lee Family

Data sourced from Thomson Reuters' Web of Knowledge

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