Zone refining (Fractional Crystallization) is indispensable for producing ultra-pure semiconductors like Silicon and Germanium. What fundamental physical chemistry principle governs this elegant purif

Question

Zone refining (Fractional Crystallization) is indispensable for producing ultra-pure semiconductors like Silicon and Germanium. What fundamental physical chemistry principle governs this elegant purification technique?

Prashant Kotian · Accepted Answer

Correct answer: C. Zone refining works because impurities "prefer" the liquid phase over the solid phase. As a circular induction heater moves slowly along the metal rod, it creates a moving molten zone. The pure metal crystallizes behind the heater, while the impurities are continually swept forward, remaining dissolved in the advancing melt until they reach the end of the rod.

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