A model of compositional surface phase transitions in ternary alloys

被引：11

作者：

Cheng, WC ^{[1
]}

Wynblatt, P ^{[1
]}

机构：

[1] CARNEGIE MELLON UNIV, DEPT MAT SCI & ENGN, PITTSBURGH, PA 15213 USA

来源：

SURFACE SCIENCE | 1996年 / 364卷 / 03期

基金：

美国国家科学基金会;

关键词：

alloys; bismuth; equilibrium thermodynamics and statistical mechanics; lead; nickel; surface energy; surface segregation; surface thermodynamics;

D O I：

10.1016/0039-6028(96)00651-6

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：

A model for calculating the surface excess free energy of segregated ternary alloy surfaces is presented It is based on nearest neighbor interactions, and also accounts for strain energy effects associated with segregated solutes at the surface. In particular, the model is exercised for the case of Pb-Bi-Ni alloys, for which compositional surface phase transitions have been observed experimentally. The model displays the observed phase transitions, and is useful in interpreting other features of the experimental temperature dependence of solute surface concentration, such as site competition effects.

引用

页码：409 / 416

页数：8

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