THE ENHANCEMENT OF LEAD SELF - DIFFUSIVITY BY GOLD AND SILVER ADDITIONS.

摘要

It is proposed that noble metal solutes diffuse in lead primarily by the interstitial mechanism,while cadmium solute diffuses by means of tightly-bound interstitial-vacancy pairs. It is reasoned that noble metal interstitial ions should also interact attractively with lead vacancies and result in a small enhancement of the self-diffusivity with solute additions. Consequently,lead self-diffusivity has been measured as a function of small gold and silver solute additions. The linear enhancement factors determined from these measurements are most consistent with the interpretation that noble metal solutes diffuse primarily by the interstitial mechanism,and that the relatively small enhancements of lead self-diffusion are due to attractively bound interstitial-vacancy pairs. (Author)