Zone refining is an iterative process. It involves a thermal scan across a material ingot and removing the contaminated section at the end of a scan, and then starting over until the desired purity is...


Zone refining is an iterative process. It involves a thermal scan across a material ingot and removing the contaminated section at the end of a scan, and then starting over until the desired purity is reached.


(a) Starting with for the change in impurity concentration at location x, derive the concentrations after a single pass given by


(b) Similarly, in the limit of an infinite number of scans (i.e. n∞), show that the impurity concentration is given by




Nov 30, 2021
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