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Effect of Fluoride on Crystallization in High Calcium and Magnesium Glasses

Published online by Cambridge University Press:  25 February 2011

E. Wang
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
H. Kuang
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
K.S. Matlack
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
A.C. Buechele
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
Sabrina S. Fu
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
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Abstract

Glasses containing fixed mutual ratios of Al, B, Ca, Fe, Mg, Na, and Si were melted while varying the fluoride content. The effect of fluoride was to suppress the formation of non-fluoride-containing crystals in the composition range from 0 to 11 wt. % F; above 11 wt. % F, the formation of fluoride containing crystals began to define the liquidus temperature. The effect of fluoride on the liquidus temperature was quantified and used to predict the liquidus temperature of melts made from real radioactive wastes. Although the liquidus temperatures of the surrogate and radioactive glasses agreed well, the types of crystals formed differed due to slight compositional differences introduced by the waste stream.

Type
Research Article
Copyright
Copyright © Materials Research Society 1994

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References

1 Saraswati, V. and Raoot, S., J. Mat. Sci. 27, 429 (1992).CrossRefGoogle Scholar
2 Seddon, A.B., Williams, D.L., and Clare, A.G., Phys. and Chem. of Glasses, 31 64 (1990).Google Scholar
3 Cable, M. and Yang, Y.X., Phys. and Chem. of Glasses, 34 18 (1993).Google Scholar
4 EPA SW846 Test Methods for Evaluating Solid Waste, 3rd Ed. Method 3015. Proposed Update II, (1990).Google Scholar
5 This is consistent with a melting experiment performed for us by Electroscan using their Environmental Scanning Electron Microscope (ESEM) equipped with a hot-stage and sample probe connected to a Balzers Quadrupole Mass Spectrometer. Melting cycles in both N2 and H2O atmospheres gave evidence of BF3 as a significant mode of fluoride loss.Google Scholar

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