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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: yzx@ansto.gov.au
K.P. Hart
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: yzx@ansto.gov.au
B.S. Thomas
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: yzx@ansto.gov.au
Z. Aly
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: yzx@ansto.gov.au
H. Li
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: yzx@ansto.gov.au
M. Carter
Affiliation:
Materials Division, ANSTO, PMB 1, Menai 2234, Australia Email: yzx@ansto.gov.au
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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

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References

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