ON THE CONSPICUOUS SEGREGATION BEHAVIOR ATPt–RhSURFACES

C. Creemers (), S. Helfensteyn, J. Luyten, M. Schurmans and H. H. Brongersma
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C. Creemers: Fysico-chemisch Laboratorium, Katholieke Universiteit Leuven, W. de Croylaan 46, B-3001 Leuven, Belgium
S. Helfensteyn: Fysico-chemisch Laboratorium, Katholieke Universiteit Leuven, W. de Croylaan 46, B-3001 Leuven, Belgium
J. Luyten: Fysico-chemisch Laboratorium, Katholieke Universiteit Leuven, W. de Croylaan 46, B-3001 Leuven, Belgium
M. Schurmans: Fysico-chemisch Laboratorium, Katholieke Universiteit Leuven, W. de Croylaan 46, B-3001 Leuven, Belgium
H. H. Brongersma: Faculty of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

Surface Review and Letters (SRL), 2004, vol. 11, issue 03, 341-348

Abstract: Phase demixing is evaluated as a possible explanation for the anomalous temperature dependence of thePtsegregation at thePt50Rh50(511),Pt25Rh75(110)andPt25Rh75(100)surfaces. Calculations are performed in the quasichemical approximation and a broken bond scheme. Although the calculations based on systematic demixing tend to overestimate the surface enrichment, the qualitative agreement appears to be rather good.

Keywords: Semiempirical models and model calculations, surface thermodynamics (including phase transitions), surface segregation, alloys, platinum, rhodium, 05.70.Np (interface and surface thermodynamics), 61.43.Bn (structural modeling of disordered solids including serial-addition models, computer simulation), 68.35.Md (surface thermodynamics and surface energies of solids), 68.35.Dv (composition, segregation; defects and impurities (solid surfaces/interfaces)), 64.75.+g (solubility, segregation, and mixing; phase separation), 68.35.Rh (phase transitions and critical phenomena (solid surfaces/interfaces)) (search for similar items in EconPapers)
Date: 2004
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DOI: 10.1142/S0218625X04006153

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