Zone refining

a process of purifying any of various metals and other materials, as germanium or silicon, by passing it in bar form through an induction coil.
a technique for producing solids of extreme purity, esp for use in semiconductors. The material, in the form of a bar, is melted in one small region that is passed along the solid. Impurities concentrate in the melt and are moved to the end of the bar


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