Interactions of oxygen and uranium studied by combined AES, XPS and DRS techniques

Swissa, E.; Bloch, J.; Atzmony, U.; Mintz, M.H.

doi:10.1016/0039-6028(89)90426-3

Cited by 25 publications

(10 citation statements)

References 16 publications

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“…It is well known that uranium (U) behaves very actively in environmental atmosphere which leads to the critical surface corrosion in nuclear applications [1]. The oxidation process which plays an important role in the surface corrosion of U has received considerable attention in the past few decades [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…The study of the interaction of O 2 , CO and CO 2 with thorium and U surfaces showed that the adsorbed molecule tends to dissociate followed by the penetration of the carbon atoms into the bulk forming carbide, while the dissociated O atoms remain on the surface forming oxides [7]. Swissa et al have performed some research on the surface reaction of U + O 2 and found that the adsorbed O 2 forms an island on the U surface at the first stage, and subsequently spreads over the whole surface [1]. Theoretically, Senanayake et al have utilized the plane-wave ultrasoft pseudo-potential to study the carbon monoxide adsorption on the α-U surface [8].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The interaction of oxygen with theα-U(001) surface: anab initiostudy

Nie¹,

Ao²,

Zu³

et al. 2014

Phys. Scr.

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First-principles calculations based on density functional theory have been performed to investigate the adsorption, dissociation and diffusion of oxygen on the α-Uranium(001) surface. The results showed that O 2 tends to dissociate followed by the occupation of the two adjacent three-fold hollow sites. The weak molecular adsorption was found for O 2 adsorbed perpendicularly at the top of a uranium (U) atom. The investigation of the dissociation for O 2 from the top site with the O atoms falling into the two adjacent hollow sites indicated the spontaneous dissociation of O 2 . The surface diffusion of atomic oxygen between two adjacent hollow sites encountered an activation barrier of 0.55 eV, indicating the slow motion for O on the α-U(001) surface.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The interaction of oxygen with theα-U(001) surface: anab initiostudy

Nie¹,

Ao²,

Zu³

et al. 2014

Phys. Scr.

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“…The most obvious environmental factor to be concerned with would be U's interaction with moist air and water. Many studies indicate that the interaction of U and water leads to dissociation of the water molecule and in turn atomic adsorption of the elements oxygen (O) and hydrogen (H) [23][24][25][26][27]. As a matter of fact, the reversible process of the dissociation of water into H 2 gas is a well established one, especially in the presence of hot or metallic surfaces [28][29][30][31][32][33][34][35].…”

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confidence: 99%

Atomic H interaction with the γ‐U (100) surface

Morrison

Ray

2013

Physica Status Solidi (b)

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Theoretical analysis of the adsorption of a H atom on the (100) surface of bcc γ‐U represented by a 5 layer slab indicates an exothermic reaction with the bridge site as the preferred site with a chemisorption energy of 3.80 eV at the relativistic level of theory with spin–orbit coupling (SOC) included. The ground state magnetic configuration of the UH system is found to be nonmagnetic, in agreement with experimental results for UH3. The change in work function of the slab with the addition of the H atom is at a maximum when the adatom is bound to the top site and is 0.61 eV. H bound to the lattice in interstitial regions was also found to be exothermic in nature with the interstitial bridge site being the most stable at 2.13 eV at the nonmagnetic state with SOC included. Two potential wells were found under the surface. The first with a barrier of 0.41 eV and the second with a barrier of 0.71 eV indicating preferred H bonding with the γ‐U surface and an aversion to further diffusion into the bulk.

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“…The oxidation behavior of titanium has been studied extensively during the past three decades with dry oxygen. Rutile-TiO 2 was produced [15][16][17], and the temperature has a prominent effect on the oxidation behavior [18,19]. However, the oxidation behavior of titanium alloys oxidized at wet conditions was rarely investigated.…”

Section: Discussionmentioning

confidence: 99%