Solute Diffusion of Platinum in Rutile Titanium Dioxide |
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| Authors: | Leigh R. Sheppard Marta Bello Lamo John Holik Kirsty J. Mayfield David R. Nelson |
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| Affiliation: | 1. Solar Energy Technologies Research Group, School of Computing, Engineering and Mathematics, University of Western Sydney, , NSW, Australia;2. School of Science and Health, University of Western Sydney, , NSW, Australia |
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| Abstract: | 195Pt solute diffusion coefficients in undoped single‐crystal rutile TiO2 have been determined parallel to the c‐axis over the temperature range of 1073–1523 K and oxygen partial pressure of 101 kPa. This has yielded the following temperature dependence: ![urn:x-wiley:00027820:media:jace12130:jace12130-math-0001]( "urn:x-wiley:00027820:media:jace12130:jace12130-math-0001") On the basis of this result, it has been concluded that 195Pt diffuses via an interstitial mechanism involving rapid transport parallel to the c‐axis through open interstitial diffusion channels. While other divalent cations have also displayed diffusion via the same mechanism, and report diffusion rates that greatly exceed that for cation self‐diffusion, the overall rate of 195Pt diffusion is slow. This has been attributed to the size of Pt2+ (0.80 Å) which is comparative to the dimension of interstitial channels (0.77 Å) through which transport is believed to be taking place. |
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