The atomic structure of the UO2+x(110) surface and the effects of interstitial oxygen:: an elevated-temperature STM study

被引：22

作者：

Muggelberg, C

Castell, MR

Briggs, GAD

Goddard, DT

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[2] BNFL, Res & Technol, Springfields Works, Preston PR4 0XJ, Lancs, England

来源：

SURFACE SCIENCE | 1998年 / 402卷 / 1-3期

基金：

英国工程与自然科学研究理事会;

关键词：

low index single crystal surfaces; scanning tunneling microscopy; surface structure; uranium oxide;

D O I：

10.1016/S0039-6028(97)00938-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The (110) surface of uranium dioxide (UO2+x) single crystals has been studied by elevated-temperature scanning tunneling microscopy (STM). STM images of stoichiometric UO2(110) surfaces display a row structure which corresponds to a (1 x 1) bulk termination with missing rows along the [ITO] direction. Uranium sites are visible with atomic resolution in empty-states images above similar to 1.6 V sample bias. Interstitial oxygen in hyperstoichiometric UO2+x leads to a local redistribution of charge which appears in the STM image as dimer pairs. After dosing a UO2(110) surface with oxygen, another type of superstructure was observed which results from oxygen adsorption at surface interstitial sites. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：673 / 677

页数：5

共 8 条

[1] ELECTRONIC-STRUCTURE AND COULOMB CORRELATION-ENERGY IN UO2 SINGLE-CRYSTAL [J].