Role of stress in thin film alloy thermodynamics: Competition between alloying and dislocation formation

被引：50

作者：

Thayer, GE ^{[1
]}

Ozolins, V

Schmid, AK

Bartelt, NC

Asta, H

Hoyt, JJ

Chiang, S

Hwang, RQ

机构：

[1] Sandia Natl Labs, Livermore, CA 94551 USA

[2] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.86.660

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using scanning tunneling microscopy (STM) and first-principles local-spin-dsnsity-approximation calculations to stud; submonolayer films of Co1-cAgc/Ru(0001) alloys, we have discovered a novel phase-separation mechanism. When the Ag concentration c exceeds 0.4, the surface phase separates between a dislocated, pure Ag phase and a pseudomorphically strained Co0.6Ag0.4 surface alloy. We attribute the phase separation to the competition between two stress relief mechanisms: surface alloying and dislocation formation. The agreement between STM measurements and our calculated phase diagram supports this interpretation.

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页码：660 / 663

页数：4

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