Microstructure of the α-Al2O3(11(2)over-bar0) surface -: art. no. 115401

被引：33

作者：

Becker, T ^{[1
]}

Birkner, A ^{[1
]}

Witte, G ^{[1
]}

Wöll, C ^{[1
]}

机构：

[1] Ruhr Univ Bochum, D-44780 Bochum, Germany

来源：

PHYSICAL REVIEW B | 2002年 / 65卷 / 11期

关键词：

D O I：

10.1103/PhysRevB.65.115401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure of the alpha-Al2O3 (11 (2) over bar0) surface has been investigated by means of He-atom scattering (HAS), low energy electron diffraction (LEED), atomic force microscopy, and x-ray photoelectron spectroscopy. Heating the samples at 1600 K in air results in atomically smooth surfaces which are, however, covered by a carbon layer. No diffraction pattern could be obtained for these contaminated surfaces. Additional cleaning by sputtering and annealing under UHV conditions yielded highly ordered surfaces characterized by a well defined (1x1) diffraction pattern in HAS and LEED. Annealing above 1400 K caused a structural transition to a (12x4) phase, which is characterized by an ordered arrangement of oxygen vacancies. At room temperature the surface was found to be unreactive with regard to molecular and, surprisingly, atomic hydrogen.

引用

页数：8

共 40 条

[1] Composition and structure of the Al2O3 {0001}-(1x1) surface [J].