zone refining


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zone melting

or zone refining
n.
A purification technique for crystalline substances in which a heating system passes slowly over a bar of the material to be refined, creating a molten region that carries impurities with it across the bar.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

zone refining

n
(Chemical Engineering) 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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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If all of these conditions are met, then the predictable mathematical model described in (11) may be used to calculate the concentration [C.sub.i], after zone refining:
The format of the text is somewhat encyclopedic with key concepts in alphabetical order, from "ab initio methods" to "zone refining".