Philosophical magazine · 1966 · 87 citations · 17 references
Lead ConversionEngineeringChemistryMineral ProcessingRapid DiffusionRadioactive 198AuDiffusion CoefficientLead Single CrystalsTransport PhenomenaThermodynamicsCrystal FormationMaterials ScienceCrystal MaterialCrystallographyDiffusion ResistanceApplied PhysicsCondensed Matter PhysicsDiffusion ProcessGeochemistryChemical Kinetics
The study examines models explaining the unusually rapid diffusion of gold in lead. Diffusion of 198Au and 199Au was measured in high‑purity lead single crystals between 190 °C and 320 °C. The gold distribution follows a Gaussian profile with a diffusion coefficient D=8.7×10⁻³ exp(−10 000/RT) cm²/s, and the results are explained by gold diffusing in lead via substitutional and interstitial states.
Abstract The diffusion of radioactive 198Au and 199Au has been measured in 99·999% pure lead single crystals over the temperature range of 190°c to 320°C. The final distribution of the solute, which was initially evaporated as a thin film on the surface of the lead specimens, could be represented in most cases by c(x, t)=S 0[πDt]−1/2exp—[x 2/4Dt], although departures from this were occasionally noted. The temperature dependence of the diffusion coefficient was found to be D=8·7 × 10−3 exp—[10 000/RT] cm2/sec. A number of models that could account for the unusually rapid diffusion of gold in lead are examined. It is concluded that the present results, and those of others for related phenomena, can be rationalized by assuming that gold enters and diffuses through the lead in two states of solution, substitutional and interstitial.
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On the role of dislocations in bulk diffusion
E. W. Hart · Acta Metallurgica · 1957 · 649 citations
Mechanism of Diffusion of Copper in Germanium
F. C. Frank, David Turnbull · Physical Review · 1956 · 577 citations
On the theory of impurity diffusion in metals
A.D. Le Claire · Philosophical magazine · 1962 · 358 citations