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Titolo:
Temperature dependent morphological evolution of Pt(111) by ion erosion: destabilization, phase coexistence and coarsening
Autore:
Kalff, M; Comsa, G; Michely, T;
Indirizzi:
Rhein Westfal TH Aachen, Phys Zentrum Aachen Melaten, Inst Phys, D-52056 Aachen, Germany Rhein Westfal TH Aachen Aachen Germany D-52056 , D-52056 Aachen, Germany KFA Julich GmbH, Forschungszentrum, Inst Grenzflachenforsch & Vakuumphys, D-52425 Julich, Germany KFA Julich GmbH Julich Germany D-52425 kuumphys, D-52425 Julich, Germany Univ Bonn, Inst Theoret & Phys Chem, D-53113 Bonn, Germany Univ Bonn Bonn Germany D-53113 heoret & Phys Chem, D-53113 Bonn, Germany
Titolo Testata:
SURFACE SCIENCE
fascicolo: 1-2, volume: 486, anno: 2001,
pagine: 103 - 135
SICI:
0039-6028(20010701)486:1-2<103:TDMEOP>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-BEAM EPITAXY; SCANNING-TUNNELING-MICROSCOPY; BOMBARDMENT-INDUCED DEFECTS; STEP-EDGE DIFFUSION; X-RAY-SCATTERING; BY-LAYER GROWTH; SURFACE-MORPHOLOGY; SLOPE SELECTION; SELF-DIFFUSION; ROUGHENING INSTABILITY;
Keywords:
surface structure, morphology, roughness, and topography; sputtering; radiation damage; ion bombardment; surface diffusion; scanning tunneling microscopy; platinum; low index single crystal surfaces;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
99
Recensione:
Indirizzi per estratti:
Indirizzo: Michely, T Rhein Westfal TH Aachen, Phys Zentrum Aachen Melaten, Inst Phys, Sommerfeldstr 14, D-52056 Aachen, Germany Rhein Westfal TH Aachen Sommerfeldstr 14 Aachen Germany D-52056
Citazione:
M. Kalff et al., "Temperature dependent morphological evolution of Pt(111) by ion erosion: destabilization, phase coexistence and coarsening", SURF SCI, 486(1-2), 2001, pp. 103-135

Abstract

A scanning tunneling microscopy investigation of the morphological evolution of Pt(111) upon removal of 0.2 to 680 atomic layers by 1 keV Xe+ ion bombardment at normal incidence and at temperatures between 600 and 800 K is reported. The surface is found to become unstable in the temperature interval investigated. The destabilization of Pt(111) is most probably due to a step edge barrier for the attachment of a vacancy to an ascending step. Adatom production during ion bombardment enhances the destabilization of the surface. A qualitative change in roughness evolution is observed around 700 K,signified by an increase of the growth exponent from 0.40 to about 0.58. While below this temperature roughness buildup is due to pit formation, above 700 K it is initiated by remainders, left after vacancy island coalescence. The change in roughness evolution is caused by the onset of step atom detachment. For large removed amounts and above 700 K the surface exhibits anextended temperature regime of phase coexistence between a rough and a flat surface phase. The characteristic length scale of the surface morphology increases with the removed amount according to a power law with a temperature independent exponent of 0.28 +/- 0.02. This coarsening is due to step edge diffusion, rather than step atom detachment. The morphologies kinetically facet for the lower investigated temperatures. Possible origins for this slope selection are analyzed. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 25/11/20 alle ore 03:39:53