Hysteresis in the (1 x 1)-(7 x 7) first-order phase transition on the Si(111) surface

被引：24
作者：
Hu, CW
Hibino, H
Ogino, T
Tsong, IST
机构：
[1] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA
[2] NTT, Basic Res Labs, Atsugi, Kanagawa 2430198, Japan
来源：
SURFACE SCIENCE | 2001年 / 487卷 / 1-3期
基金：
美国国家科学基金会;
关键词：
low-energy electron microscopy (LEEM); surface thermodynamics (including phase transitions); silicon;
D O I：
10.1016/S0039-6028(01)01097-4
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 used low-energy electron microscopy to study the (1 x 1)-(7 x 7) phase transition on step-free surfaces in two-dimensional (2D) bilayer vacancy islands and islands formed on the surface of Si(111). A small and yet distinct hysteresis effect is found in the phase transition on these step-free surfaces compared to the transition on surfaces with regularly spaced steps where no hysteresis is observed. The occurrence of hysteresis on step-free surfaces is explained thermodynamically by the consideration of the change in Gibbs free energy in the phase transition based on a 2D nucleation theory. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：191 / 200
页数：10
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