Solute diffusion of platinum in rutile titanium dioxide

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[1] Sheppard, Leigh R.
[2] Lamo, Marta Bello
[3] Holik, John
[4] Mayfield, Kirsty J.
[5] Nelson, David R.
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Sheppard, L.R. (L.Sheppard@uws.edu.au) | 1600年 / Blackwell Publishing Inc., Postfach 10 11 61, 69451 Weinheim, Boschstrabe 12, 69469 Weinheim, Deutschland, 69469, Germany卷 / 96期
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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: D195Pt=1.3±3.2×10-13m2s -1exp/(-122.0±13.6kJmol-1/RT) 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. © 2012 The American Ceramic Society;
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