Abstract
Unidirectional solidification experiments with the semimetal bismuth containing up to 8.35 at % tin have been carried out to investigate the interface stability, preferred orientations and microsegregation patterns. The solid-liquid interface appeared to be more stable than predicted by theory. When the interface did break down the microsegregation pattern was related to the observation that {100} facets were present at the interface, and were observed to project into the liquid as either parallel ridges or pyramids. The growth direction preferred for any set of growth conditions appeared to be the one having an interface morphology which could satisfactorily redistribute the rejected solute.
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