Abstract
The effect of isotopic mass for diffusion of silver in lead was measured to test the proposal that silver diffuses primarily by a simple interstitial mechanism. The relative diffusivity of the radioisotopes $^{105}\mathrm{Ag}$ and $^{110m}\mathrm{Ag}$ was accurately measured by codiffusion into single crystals of high-purity lead, sectioning, and analyzing the $\ensuremath{\gamma}$ radiation from each section. The value of the effect $E$ determined from the results of three separate experiments close to 300 \ifmmode^\circ\else\textdegree\fi{}C is 0.25 \ifmmode\pm\else\textpm\fi{} 0.05. Alloying of lead with 0.08-at.% Ag did not change the value of the effect within experimental error. A further experiment performed at 150 \ifmmode^\circ\else\textdegree\fi{}C yielded approximately the same result. Since the anticipated value of $E$ for a simple interstitial mechanism is close to unity, our results indicate that the mechanism for diffusion of silver in lead is more complex than has been thought.
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