Heat-induced redistribution of surface oxide in uranium

Swissa, E.; Shamir, N.; Mintz, M.H.; Bloch, J.

doi:10.1016/0022-3115(90)90315-e

Cited by 16 publications

(7 citation statements)

References 19 publications

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“…Such an observation suggests the outer oxide layer was partially reduced during the annealing. This is in agreement with the observations of Swissa et al [11] and Brumbach el al. [7] who reported thermally driven redistributions of the oxygen from the oxide over-layer into the bulk metal for uranium and erbium respectively.…”

Section: Surface Analysissupporting

confidence: 94%

The Influence of Vacuum Annealing on the Nucleation and Growth Kinetics of Uranium Hydride

et al. 2012

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The reaction kinetics of depleted uranium under constant hydrogen pressure (1 bar) have been measured as a function of reaction temperatures between 65 and 385 °C for as-polished and vacuum annealed samples. Enhanced hydrogen reactivity was observed on samples that underwent vacuum annealing prior to hydrogen exposure. The enhanced reactivity was found to be the result of enhanced nucleation rates on annealed samples since the specific rate per reacting unit area remained unaffected. X-ray photoelectron spectroscopy demonstrates that the nucleation kinetics were promoted on annealed samples as a result of the dehydration and partial reduction of the UO 2+x outer oxide layer and the formation of an oxycarbide (UO x C y ) sub-layer.

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Section: Surface Analysissupporting

confidence: 94%

The Influence of Vacuum Annealing on the Nucleation and Growth Kinetics of Uranium Hydride

et al. 2012

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“…UO 2 → U 3 O 7 → U 3 O 8 → UO 3 [5]. Additionally, at annealing temperatures above 450 • C Swissa et al [10] reported the diffusion and redistribution of the oxide into the metal as a result of heating. This redistribution was found to leave a uranium-rich surface layer and the diffusion coefficient for the process was found to obey an Arrhenius type relationship.…”

Section: Introductionmentioning

confidence: 96%

Characterisation of the surface over-layer of welded uranium by FIB, SIMS and Auger electron spectroscopy

Petherbridge

Scott

Glascott

et al. 2009

Journal of Alloys and Compounds

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“…This was demonstrated by Swissa [38] through a series of AES studies aimed at characterizing the native oxide layer and oxides produced by deliberate exposure to O. To determine the thickness and composition of the native oxide, Swissa performed AES profiling on U samples prepared using different techniques.…”

Section: B Heat-induced Modifications To the Oxide Layermentioning

confidence: 99%

“…The mechanism for the formation of the uranium-enriched region was not clear from Swissa's experiments; several possibilities are mentioned in Ref. [38].…”

Section: B Heat-induced Modifications To the Oxide Layermentioning

confidence: 99%