Abstract
In order to enhance the efficiency of pyrochemical technology, especially electrorefining process, physicochemical data of trivalent uranium in LiCl–KCl eutectic at 773 K were measured, including molar absorptivity, formal potential and diffusion coefficient of U3+ ions. The molar absorptivities of U3+ were determined to be 765 ± 48 and 686 ± 39 M−1 cm−1 at 465 and 550 nm, respectively. The formal potential of U3+/U4+ redox couple and diffusion coefficient of U3+ ions were measured to be −0.308 V vs. Ag/Ag+ and 8.7 × 10−6 M−1 cm−1, respectively. To elucidate the chemical behavior of U3+ ions under the existence of oxide ions, U3+ ions were reacted with oxides ions in situ produced at the LiCl–KCl media. Surprisingly, it was revealed from XRD patterns that UO2 was formed from the reaction between U3+ ions and O2− ions with the molar ratio of 1:1.
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This paper was supported by the New Professor Research Program of KUT and the Nuclear R & D program of the Korea Ministry of Education, Science and Technology (MEST).
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Kim, TJ., Jung, Y., Shim, JB. et al. Study on physicochemical properties of U3+ in LiCl–KCl eutectic media at 773 K. J Radioanal Nucl Chem 287, 347–350 (2011). https://doi.org/10.1007/s10967-010-0689-z
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DOI: https://doi.org/10.1007/s10967-010-0689-z