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On the Ultimate Distribution of Impurity in the Zone Melting Process
Author(s) -
Velický B.
Publication year - 1964
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19640050124
Subject(s) - ingot , zone melting , impurity , distribution (mathematics) , refining (metallurgy) , materials science , ideal (ethics) , process (computing) , thermodynamics , metallurgy , mathematics , chemistry , physics , computer science , mathematical analysis , philosophy , organic chemistry , alloy , epistemology , operating system
A general solution of the problem of the ultimate distribution in the ideal zone‐melting process in a finite ingot is given. In the case of long ingots the ultimate distribution at a large distance from the end is of the known Pfann form regardless of the freezing conditions of the last zone. On the other hand, such quantities as the final purification of the ingot, and the absolute value of the impurity concentration have a marked dependence on these conditions. Examples show that this dependence is not negligible in realistic cases. In particular, contrary to the accepted viewpoint, the re‐refining of a cropped ingot may lead to improved purification.