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Titolo:
FACETING AND RECONSTRUCTION OF STEPPED AU(111)
Autore:
WATSON GM; GIBBS D; SONG S; SANDY AR; MOCHRIE SGJ; ZEHNER DM;
Indirizzi:
BROOKHAVEN NATL LAB,DEPT PHYS UPTON NY 11973 MIT,DEPT PHYS CAMBRIDGE MA 02139 OAK RIDGE NATL LAB,DIV SOLID STATE OAK RIDGE TN 37831
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 16, volume: 52, anno: 1995,
pagine: 12329 - 12344
SICI:
0163-1829(1995)52:16<12329:FAROSA>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
VICINAL SI(111) SURFACES; X-RAY-SCATTERING; PHASE-SEPARATION; GOLD SURFACES; TRANSITIONS; MICROSCOPY; MORPHOLOGY; DOMAINS; ENERGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
G.M. Watson et al., "FACETING AND RECONSTRUCTION OF STEPPED AU(111)", Physical review. B, Condensed matter, 52(16), 1995, pp. 12329-12344

Abstract

We present the results of an x-ray scattering study of the structure and morphology of a stepped Au(111) surface between 480 and 1225 K. Atthe highest temperatures studied, the surface phase separates to formthree distinct orientational phases, each of which is reconstructed. These consist of (111) facets and two stepped phases, the latter differing in the polar and azimuthal orientations of their surface normal directions. The temperature-dependent reconstructions of the (111) facets are similar to those observed on the Au(111) surface. Specifically,the (111) facets exhibit a discommensuration-fluid phase above 700 K and a chevron phase, consisting of ordered discommensurations and kinks, below. The transformation from the discommensuration fluid phase tothe chevron phase is remarkably slow, requiring on the order of tens of hours to complete. At the highest temperatures, the terraces of both stepped domains are uniaxially compressed, resulting in a series of well-ordered linear discommensurations. In one of the stepped phases the discommensurations intersect the step edges at 60 degrees, while inthe other, they lie orthogonally to the step edges. On cooling, the latter stepped phase becomes unreconstructed below 985 K and vanishes below 775 K, resulting in a surface comprised of (111) facets in coexistence with a single reconstructed stepped phase.

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Documento generato il 27/09/20 alle ore 11:57:43