Abstract
The residual-activity method was employed to evaluate the volume and grain-boundary diffusion coefficients of mercury in the Ag3Sn alloy at temperatures ranging from 50 to 245 °C. The volume diffusion coefficient obeys the relationship Dv*=1.87×10−5 exp(−8.25×103/RT) cm2/sec. The grain-boundary diffusion coefficient evaluated from Suzuoka’s exact solution varied from 10−3 cm2/sec at 50 °C to 10−1 cm2/sec at 245 °C. The large grain-boundary-diffusion coefficient was attributed to the increased grain-boundary width of the alloy caused by the corrosive nature of the mercury.
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