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Chemical ordering of alloy surfaces: Low-index versus vicinal surfaces

Physical Review B - Condensed Matter and Materials Physics, ISSN: 1550-235X, Vol: 63, Issue: 12
2001
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Some AB fcc alloys undergo a chemical order-disorder phase transition. During the ordering process, four types of domain appear within the bulk, separated by antiphase boundaries (APB’s). As for chemical ordering in the presence of a surface, scanning tunneling microscopy and He diffraction studies consistently show a contrasting behavior between vicinals, where APB’s emerge at the surface, and low-index surfaces, where no APB’s emerge. These differences emphasize the role of the step density in surface chemical ordering. © 2001 The American Physical Society.

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