Abstract
Abstract Measurements are reported of the diffusion of platinum at tracer concentrations in gold over the temperature range 800°c to close to the melting point of gold. Above about 900°c the results obtained can be fitted to the following equation : D = (7·6+4·7 −2·9) exp [-(60 900 ± 1200)/RT] cm2/sec. The magnitude of the observed activation energy relative to that corresponding to self-diffusion in gold is in qualitative agreement with current theories. Below about 900°c the observed diffusion coefficients appear to be enhanced relative to those expected by extrapolation from higher temperatures; possible explanations of this effect are discussed.
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