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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
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 | ||||
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| Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Solid State Ionics | ||||
| Publisher: | Elsevier Science BV | ||||
| ISSN: | 0167-2738 | ||||
| Official Date: | 17 June 2010 | ||||
| Dates: |
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| 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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