Formation of a two-dimensional alloy/surface phase: Auger and STM study of Cu(Sn)(111)

被引：13
作者：
Contini, G
Di Castro, V
Motta, N
Sgarlata, A
机构：
[1] CNR, Inst Mineral Proc, I-00138 Rome, Italy
[2] Univ Rome La Sapienza, Dipartimento Chim, I-00185 Rome, Italy
[3] Univ Roma Tor Vergata, Dipartimento Fis, Ist Nazl Fis Mat, I-00133 Rome, Italy
来源：
SURFACE SCIENCE | 1998年 / 405卷 / 2-3期
关键词：
alloys; Auger electron spectroscopy; copper; reflection high-energy electron diffraction (RHEED); scanning tunneling microscopy (STM); single crystal surfaces; surface segregation; tin;
D O I：
10.1016/S0039-6028(98)00139-3
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 segregation of Sn in Cu and the formation of a Sn-Cu surface alloy has been studied by Auger electron spectroscopy (AES), reflection high-energy electron diffraction (RHEED) and scanning tunneling microscopy (STM). By annealing Cu(Sn) samples at T = 500 degrees C, we have found a Sn(0.33)Cu(0.66)p(root 3 x root 3)R30 degrees reconstructed surface layer. By increasing T to 750 degrees C, the tin concentration decreases up to 0.20, while the reconstruction is maintained. Atomic-resolution STM images of this phase show no rippling, but several steps. The surface lattice parameters are 0.47 +/- 0.02 and 0.51 +/- 0.02 nm, respectively, along and across the steps. (C) 1998 Elsevier Science B.V. All rights reserved.
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页码：L509 / L513
页数：5
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