INSITU SCANNING TUNNELING MICROSCOPY OF CORROSION OF SILVER-GOLD ALLOYS

被引：128
作者：
OPPENHEIM, IC
TREVOR, DJ
CHIDSEY, CED
TREVOR, PL
SIERADZKI, K
机构：
[1] AT&T BELL LABS,600 MT AVE,MURRAY HILL,NJ 07974
[2] JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218
来源：
SCIENCE | 1991年 / 254卷 / 5032期
关键词：
D O I：
10.1126/science.254.5032.687
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
An in situ scanning tunneling microscope (STM) was used to observe the morphological changes accompanying the selective dissolution of Ag from low-Ag content Ag-Au alloys in dilute perchloric acid. This study was undertaken to explore the role of surface diffusion in alloy corrosion processes. These results are interpreted within the framework of the kink-ledge-terrace model of a crystal surface and a recent model of alloy corrosion based on a variant of percolation theory. The corrosion process leads to roughening of the surface by dissolution of Ag atoms from terrace sites. Annealing or smoothening of the surface occurs by vacancy migration through clusters and the subsequent annihilation of clusters at terrace ledges.
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收藏
页码：687 / 689
页数：3
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