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How are metals used as semiconductor ref...

How are metals used as semiconductor refined? What is the principle of the method used?

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Metals of high grade like germanium, silicon etc., used as semiconductors are refined by zone refining method.
Principle This method is based upon the principle that impurities are more soluble in molten state of metal than in solid state.
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NCERT EXEMPLAR ENGLISH-GENERAL PRINCIPLE AND PROCESSES OF ISOLATION OF ELEMENTS -Short answer type Question
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