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Study of crystallization mechanisms in the french nuclear waste glass

Published online by Cambridge University Press:  10 February 2011

X. Orlhac ,
C. Fillet  and
J. Phalippou
X. Orlhac
Affiliation:
CEA/DCC/DRRV/SCD, Centre de la Valleée du Rhône, 30207 Bagnols-sur-Cèze Cedex, France
C. Fillet
Affiliation:
CEA/DCC/DRRV/SCD, Centre de la Valleée du Rhône, 30207 Bagnols-sur-Cèze Cedex, France
J. Phalippou
Affiliation:
Laboratoire des Verres, Université de Montpellier II, 34095 Montpellier Cedex 5, France
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Abstract

The development of glass materials for long-term storage of high-level waste implies determining the glass thermal stability and notably assessing the risk of devitrification. Previous studies of the French nuclear waste glass have identified the crystalline phases and the domains in which they form, and have shown that devitrification is minimal. Modeling the long-term crystallization behavior requires an investigation of the thermodynamic and kinetic mechanisms liable to induce crystallization during cooling. The first step in this approach is to determine the nucleation and growth curves for each of the component phases. Crystals including CaMoO4, CeO2 and ZnCr2O4 were identified in glasses heat-treated at temperatures between 630°C and 1110°C, and the time and thermal dependence of the CaMoO4 morphology were evaluated. The nucleation and growth kinetics of these phases were determined by optical microscopy and SEM, and the impact of impurities was addressed by studying two glasses, with and without platinoid elements. The results indicated enhanced nucleation kinetics in glass containing platinoid elements. No induction time was observed before permanent nucleation in either of the glasses, and rapid saturation of nucleation kinetics—synonymous with the depletion of active centers of nucleation— was detected after a few hours. Furthermore, similar growth kinetics were observed in both glasses. The nucleation and growth curves coincided for all the phases. Peak values were much higher for nucleation than for growth kinetics, confirming the need for a thorough investigation of the mechanisms occurring in and below the glass transition range, i.e. in the non-equilibrium state.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 263
Copyright
Copyright © Materials Research Society 1999

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References

REFERENCES

1. Jacquet-Francillon, N., Thermal stability of Waste Form Glass, NRC Workshop on Glass as a Waste Form and Vitrification Technology, Washington DC (May 13-15, 1996).Google Scholar
2. Pacaud, F., Fillet, C., Baudin, G., Bastien-Thiry, H., 2nd International Seminar on Radioactive Waste Products, Jülich (May 2-June 6, 1990).Google Scholar
3. Cheron, P. et al., Scientific Basis for Nuclear Waste Management XVIII, Kyoto (October 23-27, 1994) vol.353 (1995).Google Scholar
4. Pacaud, F., Fillet, C., Jacquet-Francillon, N., Scientific Basis for Nuclear Waste Management XV, Strasbourg (November 4-7, 1991) vol.257 (1992).Google Scholar
5. Kalinina, A. M., Filipovich, V. N., Fokin, V. M., J. Non-Cryst. Solids 38–39, 723 (1980).Google Scholar
6. Kelton, K. F., Greer, A. L., Thompson, C. V., J. Chem. Phys. 79(12), 6261 (1983).Google Scholar
7. James, P. F., Advances in Ceramics, vol.4, edited by Simmons, J. H., Uhlmann, D. R. and Beall, G. H. (The American Ceramic Society, Inc., Columbus, Ohio, 1982), pp. 1–48.Google Scholar
8. Yinnon, H., Uhlmann, D. R., J. Non-Cryst. Solids 50(2), 189 (1982).Google Scholar
9. Fullman, R. L., Trans. AIME, J. Met. 197, 447 (1953).Google Scholar
10. DeHoff, R. T., Rhines, F. N., Quantitative Microscopy (McGraw Hill, New York, 1968).Google Scholar
11. James, P. F., Physics Chem. Glasses 15(4), 95 (1974).Google Scholar
12. Zanotto, E. D., Galhardi, A., J. Non-Cryst. Solids 104(1), 73 (1988).Google Scholar
13. Li, D., Sengers, G. F., Janssen, F. J. J. G., J. Mater. Sci. Lett. 11, 928 (1992).Google Scholar
14. Gutzow, I., Contemp. Phys. 21(3), 243 (1980).Google Scholar
15. Scherer, G. W., Uhlmann, D. R., J. Non-Cryst. Solids 23, 59 (1977).Google Scholar
16. James, P. F., Ceramic Transactions, vol.30, edited by Weinberg, M. C. (The American Ceramic Society, Inc., Westerville, Ohio, 1992), pp. 3–12.Google Scholar
17. Pacaud, F. (private communication).Google Scholar
18. Advocat, T. (private communication).Google Scholar
19. Jacquet-Francillon, N., Pacaud, F., Queille, P., Scientific Basis for Nuclear Waste Management V, Berlin (June 7-10, 1982) vol.11 (1982).Google Scholar
20. Malow, G., Scientific Basis for Nuclear Waste Management XII, Kyoto (October 10-13, 1988) vol.127 (1989).Google Scholar