Chromium segregation in Cr-doped TiO2 (rutile): impact of oxygen activity

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dc.contributor.authorRahman, KAen_AU
dc.contributor.authorSharma, Nen_AU
dc.contributor.authorAtanacio, AJen_AU
dc.contributor.authorBak, Ten_AU
dc.contributor.authorWachsman, EDen_AU
dc.contributor.authorMoffit, Men_AU
dc.contributor.authorNowotny, Jen_AU
dc.date.accessioned2020-12-16T21:51:48Zen_AU
dc.date.available2020-12-16T21:51:48Zen_AU
dc.date.issued2019-01-04en_AU
dc.date.statistics2020-12-15en_AU
dc.description.abstractThis work considers the effect of chromium surface segregation for polycrystalline Cr-doped TiO2 on surface vs. bulk defect disorder. It is shown that annealing of Cr-doped TiO2 (0.04 at% Cr) in the gas phase of variable oxygen activity at 1273 K results in a gradual transition in the valence of chromium at the surface from predominantly Cr3+ species in reduced conditions, p(O2) = 10−12 Pa, to comparable concentrations of both Cr3+ and Cr6+ species in oxidising conditions, p(O2) = 105 Pa. The reported data is considered in terms of defect equilibria leading to the formation of positively and negatively charged chromium in both the cation sub-lattice and interstitial sites. The derived theoretical models represent the effect of oxygen activity on the surface charge and the resulting electric field leading to migration mechanism of charged chromium species. © 2019 Springer Natureen_AU
dc.identifier.citationRahman, K. A., Sharma, N., Atanacio, A. J., Bak, T., Wachsman, E. D., Moffitt, M., & Nowotny, J. (2019). Chromium segregation in Cr-doped TiO 2 (rutile): impact of oxygen activity. Ionics, 25(7), 3363-3372. doi:10.1007/s11581-018-2828-4en_AU
dc.identifier.issn0947-7047en_AU
dc.identifier.issue7en_AU
dc.identifier.journaltitleIonicsen_AU
dc.identifier.pagination3363-3372en_AU
dc.identifier.urihttps://doi.org/10.1007/s11581-018-2828-4en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10113en_AU
dc.identifier.volume25en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectTitanium oxidesen_AU
dc.subjectRutileen_AU
dc.subjectChromiumen_AU
dc.subjectOxygenen_AU
dc.subjectSegregationen_AU
dc.subjectX-ray photoelectron spectroscopyen_AU
dc.titleChromium segregation in Cr-doped TiO2 (rutile): impact of oxygen activityen_AU
dc.typeJournal Articleen_AU
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