THE STRUCTURE OF THE PT(110)1 X-2 SURFACE AND ITS 1 X-2 REVERSIBLE-ARROW 1 X-1 STRUCTURAL TRANSITION .1. RHEED FROM THE PERIODIC PART OF THE STRUCTURE

DC FieldValueLanguage
dc.contributor.authorKORTE, U
dc.contributor.authorMEYEREHMSEN, G
dc.date.accessioned2021-12-23T15:57:03Z-
dc.date.available2021-12-23T15:57:03Z-
dc.date.issued1992
dc.identifier.issn00396028
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/2682-
dc.description.abstractThe 1 x 2 missing-row structure of the Pt(110) surface and its structural 1 x 2 half arrow right over half arrow left 1 x 1 order-disorder transition were investigated using RHEED. Rocking curves were measured at 25 different crystal temperatures between 300 and 1200 K. A dynamical evaluation of these curves, based on a nonlinear optimization scheme, is presented. Furthermore, a new method is used which allows an estimate of the reliability of fit parameters. This represents an efficient alternative to the calculation of R-factor contour plots. It is shown that the rocking curves can be interpreted rather well even in the disordered 1 x 1 phase, if the dynamical scattering is assumed to be from the mean periodic potential of each layer. Structural parameters for the missing-row phase were derived which are compatible with the findings by some other techniques at 300 K: especially a contraction of the top-layer spacing, pairing in the second and buckling in the third layer. We find a 2D-Ising-like decrease of the 1 x 2 order parameter with a critical temperature T(c) = 855 K. About 20-50 K above T(c), an increasing surface roughness can be deduced from different coverages of different surface layers. A decrease of the contraction of the top-layer spacing accompanies the beginning of the roughening.
dc.language.isoen
dc.publisherELSEVIER SCIENCE BV
dc.relation.ispartofSURFACE SCIENCE
dc.subject1X1 PHASE-TRANSITION
dc.subjectAU(110) SURFACE
dc.subjectChemistry
dc.subjectChemistry, Physical
dc.subjectEMBEDDED ATOM METHOD
dc.subjectENERGY ELECTRON-DIFFRACTION
dc.subjectION-SCATTERING
dc.subjectIR(110) SURFACE
dc.subjectLEED INTENSITIES
dc.subjectMISSING-ROW MODEL
dc.subjectPHYSICAL REALIZATION
dc.subjectPhysics
dc.subjectPhysics, Condensed Matter
dc.subjectRECONSTRUCTION
dc.titleTHE STRUCTURE OF THE PT(110)1 X-2 SURFACE AND ITS 1 X-2 REVERSIBLE-ARROW 1 X-1 STRUCTURAL TRANSITION .1. RHEED FROM THE PERIODIC PART OF THE STRUCTURE
dc.typejournal article
dc.identifier.doi10.1016/0039-6028(92)90923-T
dc.identifier.isiISI:A1992JA63900035
dc.description.volume271
dc.description.issue3
dc.description.startpage616
dc.description.endpage640
dc.identifier.eissn18792758
dc.publisher.placePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
dcterms.isPartOf.abbreviationSurf. Sci.
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