Abstract
The reactivity between liquid uranium and polycrystalline yttria substrates of various grain-sizes is studied at 1673 K under high vacuum–low p O 2 conditions ( p O 2 ≈10 −7 Pa ). At short contact times, uranium oxidation occurs at the metal/oxide interface from oxygen transferred from the yttria substrate which is transformed to an under-stoichiometric state. At long contact times, deoxidation occurring at the uranium free surface predominates and leads to complete elimination of oxidized uranium by a dissolution–evaporation mechanism.
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