STRUCTURAL STUDY OF ALLOY FORMATION AT THECo-Pt(111)INTERFACE

Monica Galeotti, Andrea Atrei, Ugo Bardi (), Brunetto Cortigiani, Gianfranco Rovida and Marco Torrini
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Monica Galeotti: Dipartimento di Chimica, Università di Firenze, Via G. Capponi 9, 50121 Firenze, Italy
Andrea Atrei: Dipartimento di Chimica, Università di Firenze, Via G. Capponi 9, 50121 Firenze, Italy
Ugo Bardi: Dipartimento di Chimica, Università di Firenze, Via G. Capponi 9, 50121 Firenze, Italy
Brunetto Cortigiani: Dipartimento di Chimica, Università di Firenze, Via G. Capponi 9, 50121 Firenze, Italy
Gianfranco Rovida: Dipartimento di Chimica, Università di Firenze, Via G. Capponi 9, 50121 Firenze, Italy
Marco Torrini: Dipartimento di Chimica, Università di Firenze, Via G. Capponi 9, 50121 Firenze, Italy

Surface Review and Letters (SRL), 1996, vol. 03, issue 05n06, 1691-1700

Abstract: This study examines the structure of the surface alloys that form at the surface of the system formed by depositing cobalt on the cleanPt(111)surface. Using mainly XPD as a structure-sensitive technique, surface alloys were observed to form in this system after annealing at temperatures of about 600 K or higher. When starting with a single atomic layer of cobalt, diffusion leads to a surface phase where Pt atoms occupy mainly the topmost layer while cobalt atoms are mainly located in the second layer from the surface. Multi-atomic-layer alloying, with the formation of an epitaxial, random substitutionalCo-Pt(111)alloy, is observed at higher temperatures.

Date: 1996
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DOI: 10.1142/S0218625X96002631

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