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Alteration of Microstructure of West Valley Glass by Heat Treatment

Published online by Cambridge University Press:  21 February 2011

A. C. Buechele ,
X. Feng ,
H. Gu  and
I. L. Pegg
A. C. Buechele
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
X. Feng
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
H. Gu
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
I. L. Pegg
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
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Extract

Samples of West Valley reference glass WVCM-59 were subjected to isothermal heat treatment according to a systematic schedule of time-temperature combinations. Phases crystallizing during heat treatment were analyzed and quantified using an SEM equipped with an energy dispersive x-ray detector and image processing and analyzing capabilities. Only small amounts of noble metals (e.g. Rh, Pd) and RuO2 were present in the as-melted glass, but these frequently serve as nucleation sites during heat treatment. Iron-group spinels containing Fe, Ni, Cr, and Mn in variable proportions were the most common phases observed, appearing in quantities up to 3.5 vol% in heat treated glass. The formation of a thoria-ceria phase occurred at temperatures of 900°C and below. Acmites formed at temperatures of 800°C and below. A lithium phosphate phase with a particularly interesting morphology developed after prolonged heat treatment at temperatures between 600–750°C. The same phase appeared in a range of glass compositions. However, canister cooling curves preclude such a phase in production glass. Furthermore, no such phase was found in actual canister-cooled glass.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 176: Symposium U – Scientific Basis for Nuclear Waste Management XIII , 1989 , 393
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

1. Joseph, I., Mathur, A., Sehgal, J., Butts, D., Palmiter, T. and Pye, L. D.. The Properties and Crystallization Behavior of West Valley Reference Borosilicate Glass. Progress Report for the period October 1, 1987-September 30, 1988 Alfred University: Alfred, N. Y. 21, 22 (1988).Google Scholar
2. Eisenstatt, L. R.. West Valley Nuclear Services Co. Inc., Technical Advisory #43, West Valley, N. Y. (1987).Google Scholar
3. Keith, M. L.. J. Am. Ceram. Soc. 37 490 (1954).Google Scholar
4. Bickford, Dennis F. and Jantzen, Carol M.. Scientific Basis for Nuclear Waste Management VII, edited by McVay, G. L. (Elsevier Scientific Publishers, New York, 1984) pp. 557–566.Google Scholar
5. Jantzen, Carol M. and Bickford, Dennis F., Scientific Basis for Nuclear Waste Management VIII, edited by Jantzen, C. M., Stone, J. A., and Ewing, R. C., (Mater. Res. Soc. Proc. 44, Pittsburgh, PA, 1986) pp. 135–146.Google Scholar
6. Jantzen, Carol M., Bickford, Dennis F., and Karraker, David G., Advances in Ceramics, 8 (Am. Ceram. Soc., Columbus, OH 1984) pp 30–38.Google Scholar
7. Osterheld, R. K.. Inorg. Nucl. Chem. 30, 3174 (1968).Google Scholar