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  • 1
    Electronic Resource
    Electronic Resource
    Effects of presulfidization on the selectivity and surface structure of ruthenium catalysts (1989)
    s.l. : American Chemical Society
    Langmuir 5 (1989), S. 1309-1315 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00090a005
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phase determination and spatial distribution of an ion-beam mixed internal interface: Fe/Sn (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 3121-3131 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ion-beam mixing of tin on iron provides corrosion protection against high-temperature oxidation. Previous studies have been inconclusive as to the exact composition and distribution of alloys produced at the Fe/Sn interface. This study provides a detailed diagram of Fe-Sn specimens after ion-beam mixing with Ar+ at 40 keV and a dose of 5×1016 ions/cm2 . The interface was isotopically labeled with 7.5 nm of 57 Fe and 119 Sn so that dual perspective conversion electron Mössbauer spectroscopy could be performed. Analyses in this manner allowed comparison of 119 Sn conversion electron Mössbauer spectroscopy (CEMS) and 57 Fe CEMS spectra to accurately assign spectral components which could not be conclusively assigned using a single CEMS perspective. Information from Rutherford backscattering spectrometry confirmed the layered nature of specimens prior to implantation and was used for depth determination of the mixed region after implantation. X-ray photoelectron spectroscopy, secondary ion mass spectrometry, and scanning electron microscopy also provided information after implantation. Data indicate the formation of a uniform amorphous surface during implantation resulting in a heterogeneous mixture of components consisting mainly of dilute tin in iron (approximately 8-at. % Sn) and FeSnx (x≈1). About 80% of the 37.5-nm tin overlayer was removed by sputtering. The components identified are somewhat more iron rich than previous assignments and illustrate the difference in surface structures resulting from various implantation parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345389
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fibrous metal–carbon composite structures as gas diffusion electrodes for use in alkaline electrolyte (1997)
    Springer
    Journal of applied electrochemistry 27 (1997), S. 9-17 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The fabrication of novel fibre composite electrode structures and the performance assessments for oxygen reduction in alkaline electrolyte is reported. An array of 2μm diameter activated carbon fibres interlocked within a network of 2μm sinter-bonded metal fibres to form the composite structure was used. The resulting electrode structure is stable, highly conductive and can maintain void fraction exceeding 95%. Electrode physical properties including thickness, macroporosity, volume and mass fractions of constituent carbon and metal fibres have been controlled, characterized, and related to the electrode polarization in a KOH half cell. Comparisons have been made with a commercial Teflon-bonded gas diffusion electrode (GDE). It has been demonstrated that this novel method allows reproducible and low-cost fabrication of GDEs with the optimal balance between macropores for gas access, micropores for liquid access, and conductive paths for electron access.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026454513293
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cems investigations of reactions at buried MoS2−Fe interfaces (1990)
    Springer
    Hyperfine interactions 57 (1990), S. 2141-2146 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Understanding the chemistry at buried MoS2−Fe interfaces is important since it impacts on the adhesion and wear characteristics of lubricant-substrate systems. To probe those syntems, conversion Electron Mössbauer Spectroscopy (CEMS) was employed to provide nondestructive characterization of the chemistry and crystallographic orientation at the interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405777
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Generation of low energy resonant electrons during relaxation of57Fe (1988)
    Springer
    Hyperfine interactions 41 (1988), S. 737-740 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Collection of low energy electrons (〈15 eV) duringConversionElectronMossbauerSpectroscopy (CEMS) provides enhanced surface sensitivity. Spectra collected from a 0.92857Fe foil using retarding field energy analyzers in conjunction with spiraltron electron multipliers demonstrates both resonant and nonresonant count rates which decrease by as much as 50% at 10 eV bias potential. Spectra from samples with the topmost 1.0 nm chemically labeled had total spectral areas of 99.0%mm/sec. The area ratio of the resonant 1.0 nm overlayer to the resonant substrate was 1.43 at 0 eV bias potential while at 15 eV the ratio decreased to 0.72. By vacuum evaporating a 5.0 nm copper coating on the sample, near complete attenuation of the low energy electrons from the 1.0 nm overlayer was achieved. These results suggest that some low energy electrons below 15 eV are formed as primary products of electronic relaxation following nuclear decay and that they are not the result of straggling or other scattering phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02400496
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A theoretical model for the analysis of backscattered-conversion electron Mössbauer spectroscopy: Angular and energy distributions (1988)
    Springer
    Hyperfine interactions 42 (1988), S. 1149-1152 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The intensities of resonant and nonrescnant electrons emerging from the absorber in specific angular intervals have been studied using the model developed previously /1/ for a 1.0 μm thick 0.92857Fe foil mounted on a stainless steel substrate. The signal-to-background (S/B) ratio, which is proportional to the spectral area from a conversion electron Mossbauer spectrum, has been calculated and compared with experimental data. The simulated angular distributions for backscattered-resonant, and backscattered-nonresonant electrons both provide cosine-type ourves and are similar to experimental data, resulting in an isotropic distribution of the S/B ratio. The predicted S/B ratio, however, is about twioe the S/B ratio measured experimentally. This discrepancy may result from the neglect of: (i) electrons below 50 eV and (ii) multiple scattering events. Despite these shortoomings the model proposed in this study is capable of comparing the relative magnitude of the resonant and nonresonant signals, thereby, calibrating the resonant signal against the nonresonant background. This prooedure appears to provide important information helpful for nondestructive depth-profiling studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395594
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    Paper (German National Licenses)
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