Please use this identifier to cite or link to this item:
|Title:||Surface alteration evidence for a mechanism of anoxic dissolution of UO2|
|Authors:||POPEL ALEKSEJ J.; TAN BENG THYE; GOUDER THOMAS; LAMPRONTI GIULIO I.; DAY JASON; ELOIRDI RACHEL; SEIBERT ALICE; FARNAN IAN|
|Citation:||APPLIED SURFACE SCIENCE vol. 464 p. 376-379|
|Publisher:||ELSEVIER SCIENCE BV|
|Type:||Articles in periodicals and books|
|Abstract:||A secondary phase has been observed to nucleate on the surface of UO2 in a solution with uranium concentration values of ∼10−9 mol/l. The UO2 was in the form of a 100 nm single crystalline film of UO2 epitaxially deposited on the (0 0 1) surface of a single crystalline silicon substrate. An extended (140 days) dissolution experiment with UO2 in contact with a solution in deoxygenated, deionised water, under an Ar atmosphere (∼0.1 O2 ppm) at ambient temperature (∼25 °C) suggests that uranium dioxide should dissolve and precipitate while remaining in the U4+ oxidation state to enable nucleation of a low solubility secondary phase. A mechanism for the anoxic dissolution of UO2 in deionised water is proposed that involves U4+ dissolution at defect sites that subsequently nucleate and precipitate in a less defective form.|
|JRC Directorate:||Nuclear Safety and Security|
Files in This Item:
There are no files associated with this item.
Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.