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Titolo:
ORIENTATIONAL PHASE-DIAGRAM OF THE STEPPED AU(001) SURFACE
Autore:
WATSON GM; GIBBS D; ZEHNER DM; YOON M; MOCHRIE SGJ;
Indirizzi:
UNIV MARYLAND BALTIMORE CTY,DEPT PHYS,1000 HILLTOP CIRCLE BALTIMORE MD 21250 BROOKHAVEN NATL LAB,DEPT PHYS UPTON NY 11973 OAK RIDGE NATL LAB,DIV SOLID STATE OAK RIDGE TN 37831 MIT,DEPT PHYS CAMBRIDGE MA 02139
Titolo Testata:
Surface science
fascicolo: 1-3, volume: 407, anno: 1998,
pagine: 59 - 72
SICI:
0039-6028(1998)407:1-3<59:OPOTSA>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEXAGONALLY RECONSTRUCTED PT(001); GOLD SURFACES; EPITAXY; CRYSTALS; AU(100);
Keywords:
EQUILIBRIUM THERMODYNAMICS AND STATISTICAL MECHANICS; GOLD; SINGLE CRYSTAL SURFACES; STEPPED SINGLE CRYSTAL SURFACES; X-RAY SCATTERING, DIFFRACTION, AND REFLECTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
G.M. Watson et al., "ORIENTATIONAL PHASE-DIAGRAM OF THE STEPPED AU(001) SURFACE", Surface science, 407(1-3), 1998, pp. 59-72

Abstract

We report an X-ray scattering study of the structure and morphology of a stepped Au(001) surface between room temperature and bulk melting. At high temperatures, between 1170 and 1220 K, the vicinal Au(001) surface appears rough. Below T-0 = 1170 K, there is a facetting transition: hexagonally reconstructed (001) facets appear in coexistence with unreconstructed, stepped domains. The tilt angle of the stepped domains increases with decreasing temperature, exhibiting a power-law behavior versus reduced temperature. The phase behavior of the hexagonally reconstructed domains follows that observed on nominally unstepped Au(001) surfaces. At T-1 = 992 K, there is a second facetting transition at which the stepped domains reconstruct to form a rotated and corrugated, quasi-hexagonal structure. The corrugation is threefold commensurate with the average terrace width, consistent with a 2 degrees magic vicinal phase. The orientational phase diagram of vicinal Au(001) is deduced and found to be qualitatively similar to that of vicinal Pt(001), although with intriguing differences. (C) 1998 Elsevier Science B.V. All rights reserved.

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Documento generato il 20/09/20 alle ore 06:49:18