Diffusion of Antimony in Silver

The diffusion coefficient of antimony tracers in single crystals of pure silver has been measured as a function of temperature over the range 468-942^∘{}C. The relation D=D₀exp(-H/RT) was found to be obeyed with $H=38320$ cal/mole and D₀=0.169 cm²/sec. These values are in marked disagreement with those appearing in the literature. The data suggest, in addition, that any variation with temperature in D₀ of the form D₀=D₀^'Tⁿ is such that n probably lies in the range 0 to +{}. This implies that any temperature variation of H is probably less than 1 cal/mole deg.