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Dissolution of synthetic brannerite at 90°C

Conference Paper


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 Finnsjop̈n 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.

Publication Date


  • 2001

Citation


  • Zhang, Y., Hart, K. P., Thomas, B. S., Aly, Z., Li, H., & Carter, M. (2001). Dissolution of synthetic brannerite at 90°C. In Materials Research Society Symposium - Proceedings Vol. 663 (pp. 341-345).

Scopus Eid


  • 2-s2.0-0035783347

Web Of Science Accession Number


Start Page


  • 341

End Page


  • 345

Volume


  • 663

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 Finnsjop̈n 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.

Publication Date


  • 2001

Citation


  • Zhang, Y., Hart, K. P., Thomas, B. S., Aly, Z., Li, H., & Carter, M. (2001). Dissolution of synthetic brannerite at 90°C. In Materials Research Society Symposium - Proceedings Vol. 663 (pp. 341-345).

Scopus Eid


  • 2-s2.0-0035783347

Web Of Science Accession Number


Start Page


  • 341

End Page


  • 345

Volume


  • 663