Diffusion of Gold and Silver in Tin Single Crystals

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Abstract
The diffusivities D of gold and silver in high‐purity tin have been measured along the ``c'' and ``a'' directions in the temperature range 135°–225°C. They are described by DAu/Snc = 5.8×10−3 exp−(11 000/RT) cm2sec−1, DAu/Sna = 1.6×10−1 exp−(17 700/RT) cm2 sec−1, DAg/Snc = 7.1×10−3 exp−(12 300/RT) cm2 sec−1, and DAg/Sna = 1.8×10−1 exp−(18 400/RT) cm2 sec−1. These results are characterized by a very large anisotropy of diffusion compared with that found for the self‐diffusion of tin. Furthermore, these solutes diffuse orders of magnitude faster than the self‐diffusion of tin and also they diffuse fastest along the ``c'' direction, whereas tin diffuses fastest along the ``a'' direction. This unusual behavior is interpreted as evidence that silver and gold dissolve interstitially in tin and diffuse by an interstitial mechanism.

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