Hostname: page-component-6bf8c574d5-b4m5d Total loading time: 0 Render date: 2025-02-20T14:35:08.908Z Has data issue: false hasContentIssue false
  • English
  • Français

Dissolution of Synthetic Brannerite at 90°C

Published online by Cambridge University Press:  21 March 2011

Y. Zhang ,
K.P. Hart ,
B.S. Thomas ,
Z. Aly ,
H. Li  and
M. Carter
Y. Zhang
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: [email protected]
K.P. Hart
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: [email protected]
B.S. Thomas
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: [email protected]
Z. Aly
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: [email protected]
H. Li
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: [email protected]
M. Carter
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: [email protected]
Get access

Abstract

Brannerite, as a minor phase, exists in the pyrochlore-rich titanate ceramic formulations designed for immobilization of surplus weapons Pu. The dissolution of synthetic brannerite was studied at 90°C using static tests in pH 4 solution, deionized water and Finnsjön synthetic groundwater.

After 140 days the normalized U release rates into a pH 4 solution and deionized water reach similar values, ~10−2 g m−2 d−1, and are about 2 orders of magnitude higher than those in Finnsjön synthetic groundwater. The normalized Ti release rate into Finnsjön synthetic groundwater is about an order of magnitude higher than those in pH 4 solution and deionized water. The dissolution of brannerite is incongruent in the pH 4 solution and deionized water (preferential release of U over Ti), and nearly congruent in Finnsjön synthetic groundwater. SEM observations of the samples after 140 days in pH 4 solution and deionized water revealed minor surface alteration, in the form of a thin surface layer, probably TiO2, as a result of preferential releases of U in both cases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 341
Copyright
Copyright © Materials Research Society 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Jostsons, A., Vance, E.R., Ebbinghaus, B., Immobilization of Surplus Plutonium in Titanate Ceramics, Paper presented at Global 99, Jackson Hole, Wyoming, USA, 1999, Aug. 29 to Sep. 3.Google Scholar
2. Vance, E.R., Watson, J.N., Carter, M.L., Day, R.A., Lumpkin, G.R., Hart, K.P., Zhang, Y., McGlinn, P.J., M.Stewart, W.A., and Cassidy, D.J., Ceramic Transactions, 107 (2000), 561.Google Scholar
3. Ringwood, A.E., Kesson, S.E., Reeve, K.D., Levins, D.M., and Ramm, E.J., in: Lutze, W., Ewing, R.C. (Eds.), Radioactive Waste Forms for the Future, North-Holland, Amsterdam, 1988, 233–334.Google Scholar
4. Bruno, J., Cera, E., dePable, J., Duro, L., Jordana, S., Savage, D., SKB Technical report 97-33, December, 1997.Google Scholar
5. Blackford, M.G., Smith, K.L. and Hart, K.P., Mat. Res. Soc. Symp. Proc. 257 (1992), 243–249.Google Scholar
6. Zhang, Y., Hart, K.P., Day, A.R., Lumpkin, G.R., Collela, M., McGlinn, P.J., Thomas, B. and Aly, Z., unpublished data at ANSTO.Google Scholar
7. Lumpkin, G.R., Ewing, R.C., Am. Mineral., 81 (1996), 1237–1248.Google Scholar