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  • Polymer and Materials Science  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Identification of Mo(V) commonly observed in passive films formed on stainless steels (1998)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 26 (1998), S. 155-159 
    Details
    ISSN: 0142-2421
    Keywords: XPS ; x-ray photoelectron spectroscopy ; ESR ; electron spin resonance ; Mo 3d ; Mo 3p ; O 1s ; binding energies ; Mo(IV) ; Mo(V) ; Mo(VI) ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: There has been a longstanding debate and controversy in the literature with regard to the determination by XPS of the exact oxidation state of a molybdenum species commonly observed in the passive films of stainless steel. In this paper we have compared both the XPS and ESR analyses of molybdenum oxyhydroxides previously postulated to contain Mo(V) as well as Mo(IV) and Mo(VI). The compositions of these compounds closely resemble those found in the passive films of Mo-bearing stainless steel. It has been shown that the same Mo species exhibiting an XPS Mo 3d5/2 spectrum binding energy value of 230.8 eV is observed to exhibit an ESR spectra having a g factor of 1.921, which corresponds to Mo(V). © 1998 John Wiley & Sons, Ltd.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Electrochemical and XPS evidence of the aqueous formation of Mo2O5 (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 14 (1989), S. 66-70 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: XPS was employed to detect the surface species deposited on an activated platinum electrode following cathodic polarization in deaerated 0.1 M (NH4)6Mo7O24 · 4H2O solution. At - 160 mV (saturated calomel electrode, SCE), evidence was found of the possible dissociation of polymolybdate to molybdate with subsequent surface adsorption. At -340 mV (SCE) molybdate was observed to reduce to Mo5+ in the form of Mo2O5. At - 540 mV (SCE), Mo4+ was the stable species, existing in the form of tetravalent oxyhydroxide MoO(OH)2 according to XPS analysis. No further reduction from Mo4+ to lower-valent states was observed when cathodically polarized to - 900 mV (SCE). Mo2O5 was found to be unstable in air, oxidizing readily to MoO3.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740140114
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