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Interaction of NF3 with melt confinement materials in fluoride glass processing

Published online by Cambridge University Press:  31 January 2011

R. M. Atkins
Affiliation:
AT & T Bell Laboratories, Murray Hill, New Jersey 07974
M. M. Broer
Affiliation:
AT & T Bell Laboratories, Murray Hill, New Jersey 07974
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Abstract

Nitrogen trifluoride (NF3) was recently used by others as a reactive atmosphere during the melting of heavy metal fluoride glasses. This compound fluorinates oxide impurities, dehydrates the melt, and controls the oxidation state of both glassformer and impurity cations. The reaction of NF3 with nickel, silica, platinum, and vitreous carbon between 200 and 1100°C using IR absorption spectroscopy was investigated. This is an important issue, since reaction products (impurities) from the crucible and containment vessel walls may be incorporated in the melt. All materials, except for nickel, reacted below 600°C yielding corresponding fluorides (and oxides in the case of silica). The results indicate that, directly heated, vitreous carbon crucibles are preferred for melting of fluoride glasses in a NF3 atmosphere.

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Articles
Copyright
Copyright © Materials Research Society 1988

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