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  • 1980-1984  (2)
  • 73  (1)
  • Chemistry  (1)
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  • 1
    ISSN: 1432-0630
    Keywords: 71.20 ; 71.55 ; 73
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The electronic properties of Ar-ion and electron bombarded single-crystal surfaces of LiNbO3 have been investigated at room temperature by ultraviolet photoelectron spectroscopy (UPS) and x-ray excited photoelectron spectroscopy (XPS). In crystals reduced in this way, the loss of oxygen is accompanied with a loss of lithium and the creation of Nb4+ and Nb3+ ions. The relative concentrations of the various defects have been determined from their corresponding XPS core line spectra. When surface defects are produced an emission in the region of the bulk band gap appears. This gap emission is identified as arising from Nb 4d electrons due to the reduction of Nb5+ ions to Nb4+ and Nb3+ ions. The different behaviour of the gap emission upon surface treatment in the UPS and the XPS spectra is discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 35 (1984), S. 7-15 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: ESCA Untersuchungen an Stählen, gebeizt in HCl mit und ohne InhibitorzusatzEs wird berichtet über ESCA Untersuchungen (Electron Spectroscopy for Chemical Analysis) an kalt gewalzten ST 13 Stahlproben, gebeizt in HCl-Lösung mit und ohne Inhibitor-Zusatz (Dibutylthioharnstoff, DBTU). Die Ergebnisse zeigen, daß das DBTU-Molekül dissoziativ an der Metalloberfläche chemisorbiert wird. Das häufig benutzte Inhibitionsmodell, daß die Metalloberfläche durch die Inhibitormoleküle vollständig bedeckt wird und damit das Metall vor dem Angriff durch die Säure geschützt wird, kann für den Inhibitor DBTU durch unsere ESCA-Experimente nicht bestätigt werden. Die Ergebnisse sind in Übereinstimmung mit anderen Beobachtungen über die Chemisorption schwefelhaltiger Moleküle an Eisen-Oberflächen.
    Notes: ESCA experiments (Electron Spectroscopy for Chemical Analysis) on cold rolled ST 13 steel samples, etched in HCl solutions without and with inhibitor additives (dibutylthiourea, DBTU) are reported.These data showed, that DBTU is dissociatively chemisorbed at the metal surface. The frequently used assumption that the metal surface is covered by the inhibitor molecules preventing the direct attack of the acid cannot be confirmed by our ESCA results, at least for the inhibitor DBTU. The results are in agreement with previous findings on the chemisorption of sulphurous molecules on iron surfaces.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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