Matches in SemOpenAlex for { <https://semopenalex.org/work/W2076488251> ?p ?o ?g. }
Showing items 1 to 92 of
92
with 100 items per page.
- W2076488251 endingPage "395" @default.
- W2076488251 startingPage "384" @default.
- W2076488251 abstract "Abstract Pt25Rh75(100) forms a p(3×1) reconstruction at saturation coverage of oxygen (23 L O2, 600°C). A previous STM study on O/Pt50Rh50(100) suggests that every third row of the first substrate layer is shifted by half a lattice constant (“shifted rows”). We present a LEED I(E) analysis of Pt25Rh75(100) confirming the shifted-row model and find that oxygen resides in threefold-coordinated sites on both sides of the shifted rows. The adsorbate occupies those of the threefold-coordinated sites that are directly separated by the metal atom in the shifted row. Further I(E) calculations exclude the alternative threefold-coordinated adsorption site beside the shifted row as well as the fourfold-coordinated site symmetrically in between the shifted rows. We achieve a Pendry R-factor of 0.14 for the best-fit structure. Oxygen has equal bond lengths to its three metal neighbours, amounting to 1.95 A. The first substrate layer relaxes outward by 8.8% of the bulk value to 2.08 A, but we do not observe any significant relaxations of deeper layer spacings. The shifted rows pop out of the surface by 0.38 A. After determination of the oxygen adsorption site with LEED, we examine local adsorption structures on Pt25Rh75(100) at low oxygen coverage with STM. We resolve the shifted rows in real-space, and for special tip conditions, we find maxima of apparent height at in-plane positions that coincide with the oxygen position as established by quantitative LEED. We determine chemical-composition depth-profiles by quantitative LEED for three surface preparations occurring during sample preparation. While the first substrate layer of clean and annealed Pt25Rh75(100) is enriched in Pt (76%) as compared to the bulk value (25%), that in p(3×1)-O/Pt25Rh75(100) is enriched in Rh (90%). Oxygen adsorption at a moderate temperature (600°C) and formation of the p(3×1) structure reverse segregation on Pt25Rh75(100). Finally, oxygen can be removed at room temperature by exposure of the surface to hydrogen. This lifts the reconstruction but keeps the Rh enrichment of the first substrate layer." @default.
- W2076488251 created "2016-06-24" @default.
- W2076488251 creator A5006947001 @default.
- W2076488251 creator A5022355000 @default.
- W2076488251 creator A5031341481 @default.
- W2076488251 creator A5042109343 @default.
- W2076488251 creator A5065036567 @default.
- W2076488251 creator A5083449149 @default.
- W2076488251 date "1998-10-01" @default.
- W2076488251 modified "2023-09-28" @default.
- W2076488251 title "A quantitative LEED analysis of the oxygen-induced p(3×1) reconstruction of Pt25Rh75(100)" @default.
- W2076488251 cites W1965219929 @default.
- W2076488251 cites W1970984900 @default.
- W2076488251 cites W1976337997 @default.
- W2076488251 cites W1982659002 @default.
- W2076488251 cites W1989256359 @default.
- W2076488251 cites W1996125475 @default.
- W2076488251 cites W2001119050 @default.
- W2076488251 cites W2002769482 @default.
- W2076488251 cites W2007778167 @default.
- W2076488251 cites W2014632148 @default.
- W2076488251 cites W2019263596 @default.
- W2076488251 cites W2021318337 @default.
- W2076488251 cites W2022339986 @default.
- W2076488251 cites W2033372536 @default.
- W2076488251 cites W2034502843 @default.
- W2076488251 cites W2039791899 @default.
- W2076488251 cites W2040433860 @default.
- W2076488251 cites W2042470368 @default.
- W2076488251 cites W2057067938 @default.
- W2076488251 cites W2076375308 @default.
- W2076488251 cites W2085891179 @default.
- W2076488251 cites W2087057666 @default.
- W2076488251 cites W2087378229 @default.
- W2076488251 cites W2091138016 @default.
- W2076488251 cites W2093110409 @default.
- W2076488251 cites W2094778669 @default.
- W2076488251 cites W2105130048 @default.
- W2076488251 cites W2312475398 @default.
- W2076488251 cites W2460164129 @default.
- W2076488251 cites W2481200899 @default.
- W2076488251 doi "https://doi.org/10.1016/s0039-6028(98)00574-3" @default.
- W2076488251 hasPublicationYear "1998" @default.
- W2076488251 type Work @default.
- W2076488251 sameAs 2076488251 @default.
- W2076488251 citedByCount "21" @default.
- W2076488251 countsByYear W20764882512012 @default.
- W2076488251 countsByYear W20764882512015 @default.
- W2076488251 countsByYear W20764882512017 @default.
- W2076488251 countsByYear W20764882512021 @default.
- W2076488251 crossrefType "journal-article" @default.
- W2076488251 hasAuthorship W2076488251A5006947001 @default.
- W2076488251 hasAuthorship W2076488251A5022355000 @default.
- W2076488251 hasAuthorship W2076488251A5031341481 @default.
- W2076488251 hasAuthorship W2076488251A5042109343 @default.
- W2076488251 hasAuthorship W2076488251A5065036567 @default.
- W2076488251 hasAuthorship W2076488251A5083449149 @default.
- W2076488251 hasConcept C107872376 @default.
- W2076488251 hasConcept C113196181 @default.
- W2076488251 hasConcept C178790620 @default.
- W2076488251 hasConcept C185592680 @default.
- W2076488251 hasConcept C192562407 @default.
- W2076488251 hasConcept C199289684 @default.
- W2076488251 hasConcept C540031477 @default.
- W2076488251 hasConceptScore W2076488251C107872376 @default.
- W2076488251 hasConceptScore W2076488251C113196181 @default.
- W2076488251 hasConceptScore W2076488251C178790620 @default.
- W2076488251 hasConceptScore W2076488251C185592680 @default.
- W2076488251 hasConceptScore W2076488251C192562407 @default.
- W2076488251 hasConceptScore W2076488251C199289684 @default.
- W2076488251 hasConceptScore W2076488251C540031477 @default.
- W2076488251 hasIssue "3" @default.
- W2076488251 hasLocation W20764882511 @default.
- W2076488251 hasOpenAccess W2076488251 @default.
- W2076488251 hasPrimaryLocation W20764882511 @default.
- W2076488251 hasRelatedWork W1964643641 @default.
- W2076488251 hasRelatedWork W1993456033 @default.
- W2076488251 hasRelatedWork W2008215068 @default.
- W2076488251 hasRelatedWork W2015384531 @default.
- W2076488251 hasRelatedWork W2047117478 @default.
- W2076488251 hasRelatedWork W2108282120 @default.
- W2076488251 hasRelatedWork W2375709377 @default.
- W2076488251 hasRelatedWork W2899084033 @default.
- W2076488251 hasRelatedWork W3028602617 @default.
- W2076488251 hasRelatedWork W3137454011 @default.
- W2076488251 hasVolume "416" @default.
- W2076488251 isParatext "false" @default.
- W2076488251 isRetracted "false" @default.
- W2076488251 magId "2076488251" @default.
- W2076488251 workType "article" @default.