UO2 (111) Single Crystal: Comparison of Stoichiometric and Defective Surfaces by XPS

被引：10

作者：

Senanayake, Sanjaya D. ^{[1
]}

Idriss, Hicham ^{[1
]}

机构：

[1] Univ Auckland, Private Bag 92019, Auckland, New Zealand

来源：

SURFACE SCIENCE SPECTRA | 2006年 / 13卷 / 01期

关键词：

uranium dioxide; single crystal; 111; argon sputtered; oxygen defected; UO2-x; UO2+x; hypo-stoichiometric; hyper-stoichiometric; valence band; U; 4f; O; 1s;

D O I：

10.1116/11.20050601

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

This work undertakes a photoelectron study of the surface of a uranium dioxide (111) single crystal. The formation of a defected surface with argon ions sputtering can be identified as an n-type semiconductor, UO2-x phase. Annealing to high temperatures under an oxygen pressure of similar to 5 x 10(-6) Torr for 30 min or more yielded the hyper-stoichiometric p-type semiconductor, UO2+x phase. A shift in the core level line of U4+ ions is observed and attributed to a shift in the Fermi level from hyper-stoichiometric UO2+x to sub-stoichiometric UO2-x. (C) 2007 American Vacuum Society.

引用

页码：72 / 80

页数：9

共 50 条

[31] Optical properties of a mechanically polished and air-equilibrated [111] UO2 surface by Raman and ellipsometric spectroscopy [J].

Siekhaus, W. ;

Crowhurst, J. .

ACTINIDES 2009, 2010, 9

[32] Thermodynamic assessment of oxygen diffusion in non-stoichiometric UO2±x from experimental data and Frenkel pair modeling [J].

Berthinier, C. ;

Rado, C. ;

Chatillon, C. ;

Hodaj, F. .

JOURNAL OF NUCLEAR MATERIALS, 2013, 433 (1-3) :265-286

[33] Promises and pitfalls of ns-laser ablation for depth profiling of UO2 single crystals [J].

Krachler, Michael ;

Bulgheroni, Antonio .

MICROCHEMICAL JOURNAL, 2020, 158

[34] The use of the electrochemical quartz crystal microbalance (EQCM) in corrosion studies of UO2 thin film models [J].

Seibert, A. ;

Wegen, D. H. ;

Gouder, T. ;

Roemer, J. ;

Wiss, T. ;

Glatz, J-P. .

JOURNAL OF NUCLEAR MATERIALS, 2011, 419 (1-3) :112-121

[35] Molecular dynamics modelling of the thermal conductivity of off-stoichiometric UO2±x and (UyPu1-y)O2±x using equilibrium molecular dynamics [J].

Maxwell, Christopher I. ;

Pencer, Jeremy .

ANNALS OF NUCLEAR ENERGY, 2019, 131 :317-324

[36] Revision of the symmetry and the crystal structure of cejkaite, Na4(UO2)(CO3)3 [J].

Plasil, Jakub ;

Fejfarova, Karla ;

Dusek, Michal ;

Skoda, Radek ;

Rohlicek, Jan .

AMERICAN MINERALOGIST, 2013, 98 (04) :549-553

[37] Thermodynamic and Structural Modelling of Non-Stoichiometric Ln-Doped UO2 Solid Solutions, Ln = {La, Pr, Nd, Gd} [J].

Vinograd, Victor L. ;

Bukaemskiy, Andrey A. ;

Modolo, Giuseppe ;

Deissmann, Guido ;

Bosbach, Dirk .

FRONTIERS IN CHEMISTRY, 2021, 9

[38] X-ray photoelectron spectroscopy (XPS) study of surface oxidation of UO2 doped with Gd2O3 at different temperatures and atmospheres [J].

Garcia-Gomez, Sonia ;

Gimenez, Javier ;

Casas, Ignasi ;

Llorca, Jordi ;

De Pablo, Joan .

APPLIED SURFACE SCIENCE, 2023, 629

[39] Single-step, high pressure, and two-step spark plasma sintering of UO2 nanopowders [J].

De Bona, E. ;

Balice, L. ;

Cognini, L. ;

Holzhauser, M. ;

Popa, K. ;

Walter, O. ;

Cologna, M. ;

Prieur, D. ;

Wiss, T. ;

Baldinozzi, G. .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2021, 41 (06) :3655-3663

[40] Stoichiometric relation for extraction of uranium from UO2 powder using TBP complex with HNO3 and H2O in supercritical CO2 [J].

Sawada, K ;

Uruga, K ;

Koyama, T ;

Shimada, T ;

Mori, Y ;

Enokida, Y ;

Yamamoto, I .

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, 2005, 42 (03) :301-304

← 1 2 3 4 5 →