Abstract
Lead alloyed with low levels of tin has been shown to exhibit surface segregation of tin, especially in the presence of oxygen. In lead alloyed with 3 atm % tin, the grain boundaries are shown to be significant sources of tin with scanning Auger microprobe techniques. The kinetics of the segregation process have been determined for both grain boundary and boundary-free regions at room temperatures. The subsequent surface diffusion of tin from the highly enriched grain boundaries has also been studied. The rate of tin surface segregation is enhanced considerably by exposing the clean surface to oxygen. While oxygen is found to be immobile at room temperature, diffusion of tin from the highly enriched grain boundary is greatly increased.
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Schedule a callMore From: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
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