Affiliation:
1. Ultra-pure materials division, Centre for Materials for Electronics Technology (C-MET), IDA, phase-III, HCL post, Cherlapally, Hyderabad – 500 051, India
Abstract
Knowledge of distribution coefficient values is essential in estimating the refining efficiency, and plays an important role during the purification process, typically zone refining. The effective distribution coefficient "K eff " of impurities Se , Fe , Cr and Pb in tellurium was determined in the present study and found to be 0.48, 0.05, 0.25 and 0.19, respectively. The results are validated by comparing with the available published data, and we observed a difference of less than one order, which was reasonably comparable. The influence of "K eff " on zone refining efficiency was examined and it was noticed that the effective distribution coefficient increases with respect to the translation rate, which is minimum at an optimum lower translation rate (= 30 mm/h ). The relative solute concentration C/C0 is determined experimentally, which shows the best fit of experimental values with Pfann's equation. The impurity profile along the length of the zone refined ingot is also discussed.
Publisher
World Scientific Pub Co Pte Lt
Subject
Condensed Matter Physics,Statistical and Nonlinear Physics
Reference13 articles.
1. R. K. Willardson and A. C. Beer, Semiconductors and Semimetals 18 (Academic Press, New York, 1981) p. 22.
Cited by
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