Idioma:

Surface oxidation of a Pt–20% CO alloy: An x‐ray photoelectron spectroscopy and low‐energy electron diffraction study on the [100] and [111] oriented single‐crystal surfaces

Bardi, Ugo ; Beard, B. C. ; Ross, P. N.

J. Vac. Sci. Technol., A; (United States), 1988-05, Vol.6 (3), p.665-670 [Periódico revisado por pares]

United States

Texto completo disponível

Citações Citado por

Enviar para

Título:
Surface oxidation of a Pt–20% CO alloy: An x‐ray photoelectron spectroscopy and low‐energy electron diffraction study on the [100] and [111] oriented single‐crystal surfaces
Autor: Bardi, Ugo ; Beard, B. C. ; Ross, P. N.
Assuntos: 360106 - Metals & Alloys- Radiation Effects ; ALLOYS ; CHALCOGENIDES ; CHEMICAL REACTIONS ; CHEMISORPTION ; COBALT ALLOYS ; COBALT COMPOUNDS ; COBALT OXIDES ; COHERENT SCATTERING ; CRYSTAL LATTICES ; CRYSTAL STRUCTURE ; CRYSTALS ; CUBIC LATTICES ; DIFFRACTION ; DIMENSIONS ; ELECTROMAGNETIC RADIATION ; ELECTRON DIFFRACTION ; ELECTRON SPECTROSCOPY ; ELEMENTS ; FCC LATTICES ; HIGH TEMPERATURE ; HIGH VACUUM ; IONIZING RADIATIONS ; LAYERS ; MATERIALS SCIENCE ; MONOCRYSTALS ; NONMETALS ; NUCLEATION ; OXIDATION ; OXIDES ; OXYGEN ; OXYGEN COMPOUNDS ; PHOTOELECTRON SPECTROSCOPY ; PLATINUM ALLOYS ; PLATINUM BASE ALLOYS ; PLATINUM METAL ALLOYS ; POLYCRYSTALS ; RADIATIONS ; SCATTERING ; SEPARATION PROCESSES ; SORPTION ; SORPTIVE PROPERTIES ; SPECTROSCOPY ; STOICHIOMETRY ; SURFACE PROPERTIES ; THICKNESS ; THIN FILMS ; TRANSITION ELEMENT COMPOUNDS ; VERY HIGH TEMPERATURE ; X RADIATION
É parte de: J. Vac. Sci. Technol., A; (United States), 1988-05, Vol.6 (3), p.665-670
Descrição: The interaction of oxygen with the surface of a Pt alloy containing ∼20 at. % of cobalt was studied by low‐energy electron diffraction (LEED) and x‐ray photoelectron spectroscopy (XPS). At this composition, cobalt was found to be randomly substituted in the Pt fcc lattice both in the bulk and at the surface. [111] and 100] oriented single‐crystal surfaces as well as polycrystalline surfaces were studied. Dosing these surfaces with oxygen at room temperature at pressures lower than ∼1×10− 5 Torr resulted in the formation of a chemisorbed oxygen layer. At temperatures over ∼700 K dosing with oxygen in the same range of pressures led to the formation of a sequence of ordered oxide overlayers. XPS and LEED data showed that the first layer to form was an epitaxial monolayer structurally equivalent to either the (111) or (100) plane of cobalt monoxide (CoO). Under conditions of controlled oxygen dosing, CoO islands of monatomic thickness nucleated and randomly decorated a nearly pure Pt surface. This surface‐decoration structure was metastable over a narrow range of oxygen partial pressures and surface temperature. At higher temperatures and pressures, the oxide islands first coalesced, forming a compact monolayer that completely blocked the surface for chemisorption, then changed in stoichiometry and structure to form a structural precursor to Co3 O4.
Editor: United States
Idioma: Inglês

Links

View this record in Osti.gov

Voltar para lista de resultados

Realização: Logos de Redes Sociais:

Surface oxidation of a Pt–20% CO alloy: An x‐ray photoelectron spectroscopy and low‐energy electron diffraction study on the [100] and [111] oriented single‐crystal surfaces

Bardi, Ugo ; Beard, B. C. ; Ross, P. N.

United States

Buscando em bases de dados remotas. Favor aguardar.