The Cu3Au(001) surface:: a He diffraction study

被引：17

作者：

Mannori, C

Scimia, T

Cantini, P

Terreni, S

Canepa, M

Mattera, L

机构：

[1] Univ Genoa, Ist Nazl Fis Mat, I-16146 Genoa, Italy

[2] Univ Genoa, CNR, CFSBT, Dipartimento Fis, I-16146 Genoa, Italy

来源：

SURFACE SCIENCE | 1999年 / 433卷

关键词：

alloys; atom-solid scattering and diffraction; low index single crystal structure; surface structure; morphology;

D O I：

10.1016/S0039-6028(99)00120-X

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：

We present the results of a helium diffraction study of the morphology of a Cu3Au(001) surface at 140 K. Biatomic steps only are not able to describe the terrace morphology, and monoatomic steps must be included. The step height (1.855 +/- 0.015 Angstrom) is closely comparable to the bulk interlayer spacing of Cu3Au along the (001) direction (1.865 Angstrom). Two kinds of terraces have been identified. The first class (A-terraces) are the majority. They are large terraces that display the well-known c(2 x 2) ordering of the Au-Cu termination. The second type (B-terraces) consists of much smaller terraces of uncertain composition. B-terraces are separated from A-terraces by a monoatomic step. Monoatomic steps are probably bunched into pairs. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：307 / 311

页数：5

共 31 条

[1] THE ATOMIC-STRUCTURE OF ALLOY SURFACES AND SURFACE ALLOYS [J].