Oxygen transport properties in ZrO2-CeO2-Y2O3 by SIMS analysis

Citation
H. Naito et al., Oxygen transport properties in ZrO2-CeO2-Y2O3 by SIMS analysis, SOL ST ION, 135(1-4), 2000, pp. 669-673
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SOLID STATE IONICS
ISSN journal
01672738 → ACNP
Volume
135
Issue
1-4
Year of publication
2000
Pages
669 - 673
Database
ISI
SICI code
0167-2738(200011)135:1-4<669:OTPIZB>2.0.ZU;2-6
Abstract
A mixed conductor, ZrO2-CeO2-Y2O3 (Ce-YSZ), exhibits anomalous electrical p roperties depending on oxygen partial pressure and CeO2 concentration. We m easured surface reaction rates and oxygen tracer diffusion coefficients of YSZ with various CeO2 concentrations by secondary ion mass analyses. The Ce concentration dependence of oxygen tracer diffusion coefficient in air cor responds with that of the total electrical conductivity, over which the ion ic conductivity is dominant. The surface exchange coefficient, however, had a higher value in the region of 20 similar to 60 mol% CeO2 containing YSZ compared to other compositions. Ce-YSZ, which contains this region of CeO2 concentration, exhibits high electronic conduction at reducing conditions. The ionic and electronic conductivities are considered to affect the oxygen tracer diffusion coefficient and the surface exchange coefficient, respect ively. (C) 2000 Elsevier Science B.V. All rights reserved.