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  • hydrogen absorption  (1)
  • thin films  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Changes in crystallographic orientation of thin foils of palladium and palladium alloys after the absorption of hydrogen (1994)
    Springer
    Catalysis letters 30 (1994), S. 11-23 
    Details
    ISSN: 1572-879X
    Keywords: hydrogen absorption ; palladium membranes ; hydrogen diffusion ; hydrogen storage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The adsorption/absorption of hydrogen at room temperature by palladium, 16% silver-palladium and 5% ruthenium-palladium foils was studied using thermal desorption spectroscopy. Hydrogen readily diffused in the palladium and desorbed as one broad peak at about 650 K. Hydrogen also diffuses in the 16% silver-palladium foil and in the 5% ruthenium-palladium foil but with a smaller diffusion constant. Two hydrogen desorption peaks are observed for the Ru-Pd and Ag-Pd alloys, at 440 and around 650 K. The first hydrogen desorption peak is regarded as hydrogen desorbing from the surface sites while the second peak is regarded as hydrogen diffusing from the subsurface sites. The desorption order for surface hydrogen corresponds ton = 2 while the diffused hydrogen desorbs with a fractional order ofn = 1.25. The crystallographic orientation of the foils determined by X-ray diffraction shows a preferential (1,1,0) orientation along the direction of rolling of the foils before hydrogen absorption. This preferential orientation is destroyed after hydrogen adsorption for Pd and Pd-Ag but unaltered for the Pd-Ru alloy. This preferential orientation of the foils might have significant implications in membrane fabrication, since the absorption of hydrogen by Pd is very dependent on surface orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00813668
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  • 2
    Electronic Resource
    Electronic Resource
    Photoinduced enhancement of superconductivity (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 127-130 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; thin films ; photoconduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The photoinduced enhancement of superconductivity in RBa2Cu3O x (R=rare earth or yttrium) and Pr y R1−y Ba2Cu3O x was explored through temperature-dependent resistivity, Hall coefficient and mobility, and x-ray diffraction measurements. The increases inT c are enhanced near the metal-insulator transition, although photoinduced changes always exist in oxygendeficient samples. Several explanations, including intergrain Josephson coupling, photoassisted oxygen ordering, and the trapping of photogenerated electrons in oxygen vacancies, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730382
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