Abstract
Separate measurements were made at 150 \ifmmode^\circ\else\textdegree\fi{}C of the simultaneous diffusion of sodium isotopes ($^{22}\mathrm{Na}$ and $^{24}\mathrm{Na}$) and silver isotopes ($^{105}\mathrm{Ag}$ and $^{110m}\mathrm{Ag}$) in lithium. The strength of the isotope effect $f\ensuremath{\Delta}K$ for sodium is 0.19 \ifmmode\pm\else\textpm\fi{} 0.01 and for silver 0.26 \ifmmode\pm\else\textpm\fi{} 0.01. These values do not correlate well with recent calculations of $\ensuremath{\Delta}K$ determined for impurity diffusion on the basis of the dynamical theory of diffusion. Measurement of the diffusion of silver in lithium is 45% greater than earlier data, and a possible explanation for this discrepancy is given.
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