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Removal of residual chromium from aluminum oxide by containerless liquid-phase processing

Published online by Cambridge University Press:  03 March 2011

A. Biswas ,
J.K. Richard Weber  and
Paul C. Nordine
A. Biswas
Affiliation:
Microgravity Research Group. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive. Pasadena, California 91109
J.K. Richard Weber
Affiliation:
Containerless Research Inc., 910 University Place, Evanston, Illinois 60201
Paul C. Nordine
Affiliation:
Containerless Research Inc., 910 University Place, Evanston, Illinois 60201
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Abstract

Verneuil sapphire was purified of Cr3+ by containerless melting and processing at ca. 2550 K in argon, dry air, and pure oxygen. Recovered material was examined by laser induced fluorescence and Raman spectroscopy. The Cr3+ fluorescence intensity decreased in processed specimens at rates proportional to the chromium concentration and p(O2)0.21. The initial chromium concentration was ca. 5 ppm and decreased by factors of ca. 50, 3000, and 2 × 105 after processing for 300 s in argon, air, and oxygen, respectively. Evidence is presented that the Cr3+ was removed predominantly as CrO2(g) and not by conversion to other oxidation states of chromium in the condensed phase.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 7 , July 1995 , pp. 1823 - 1827
Copyright
Copyright © Materials Research Society 1995

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