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https://apo.ansto.gov.au/dspace/handle/10238/1790| Title: | Niobium diffusion in niobium-doped titanium dioxide |
| Authors: | Sheppard, LR Atanacio, AJ Bak, T Nowotny, J Nowotny, MK Prince, KE |
| Keywords: | Niobium Titanium Diffusion Crystal doping Monocrystals Oxidation |
| Issue Date: | Jul-2009 |
| Publisher: | Springer |
| Citation: | Sheppard, L. R., Atanacio, A. J., Bak, T., Nowotny, J., Nowotny, M. K., & Prince, K. E. (2009). Niobium diffusion in niobium-doped titanium dioxide. Journal of Solid State Electrochemistry, 13(7), 1115-1121. doi:10.1007/s10008-008-0717-x |
| Abstract: | The present work studied the self-diffusion coefficient of Nb-93 in Nb-doped TiO2 single crystal (4.3 at.% Nb) at high oxygen activity [p(O-2) = 21 kPa] over the temperature range 1,073 to 1,573 K. The diffusion-induced Nb-93 concentration profile was determined by using secondary ion mass spectrometry (SIMS). The subsequently determined self-diffusion coefficient of 93Nb exhibits the following temperature dependence: D-93Nb - 1.77 x 10(-9) m(2) s(-1) exp(-197 +/- 9 kJ mol(-1)/RT). This study builds upon a similar study performed previously for Nb-93 tracer diffusion in undoped TiO2, and identifies the effect of compositional change on self-diffusion behaviour. The obtained activation energy has been considered in terms of migration and formation enthalpies of titanium vacancies. © 2009, Springer. |
| Gov't Doc #: | 1300 |
| URI: | http://dx.doi.org/10.1007/s10008-008-0717-x http://apo.ansto.gov.au/dspace/handle/10238/1790 |
| ISSN: | 1432-8488 |
| Appears in Collections: | Journal Articles |
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