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Title: Chromium segregation in Cr-doped TiO2 (rutile): impact of oxygen activity
Authors: Rahman, KA
Sharma, N
Atanacio, AJ
Bak, T
Wachsman, ED
Moffit, M
Nowotny, J
Keywords: Titanium oxides
X-ray photoelectron spectroscopy
Issue Date: 4-Jan-2019
Publisher: Springer Nature
Citation: Rahman, 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/s11581-018-2828-4
Abstract: This 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 Nature
ISSN: 0947-7047
Appears in Collections:Journal Articles

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