Question

(A) In a zone refining process, show that the subsequent
impurity concentration along the refining direction a is given by:
?"(?) = ??((1 − ?)+,- where c0 is the initial impurity
concentration which is uniform throughout the specimen, and k is
the partition coefficient.

(B) Silicon is purified by a process of zone refining. If it
contains an impurity (1ppm) with a partition coefficient k = 10^-5,
how much would remain in the middle of the bar after a zone
pass?

Answer #1

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