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(C) Zone refining is based on the principle that impurities are more soluble in the melt than in the solid state of the metal. As the heater moves,the

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Very pure semiconductors

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(C) Zone refining is based on the principle that impurities are more soluble in the melt than in the solid state of the metal. As the heater moves,the pure metal crystallizes out of the melt and the impurities pass into the adjacent molten zone. This method is particularly useful for producing semiconductors like $Si, Ge, Ga, B,$ and $In$ in a very high state of purity.

The zone refining method is used to obtain.......

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