Abstract
Measurements of the self-diffusion and the isotope effect of 195Au and 199Au in gold as well as the isotope effect of 57Co and 60Co impurity-diffusion in gold are reported. A significant decrease of both types of isotope effects with increasing temperature is observed, which is attributed to a divacancy contribution to the total diffusion rate. At 1323 K D∗2vD∗ ⋍ 0.2 is deduced. This result is supported by the small curvature near Tm of the Arrhenius plot of the self-diffusion data. For cobalt impurity-diffusion via divacancies an isotope effect E2vCo ⋍ 0.3 is estimated at Tm. Assuming the validity of the jump frequency model for impurity-diffusion in fcc metals it is concluded from additional isotope effect experiments of Co in Cu and Au in Cu, that the mass dependence of the ΔK factor should be very small.
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