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  • 1
    Electronic Resource
    Electronic Resource
    Mechanically alloyed nanocrystalline Ni-Mo powders: A new technique for producing active electrodes for catalysis (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2764-2766 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the effect of strong mechanical deformations on various mixtures of Ni and Mo metallic powders. The high-energy mechanical alloying process produces metastable fcc nanocrystals of Ni with a large amount of Mo in solid solution. The solubility limit of Mo in fcc Ni at room temperature is directly related to the total interface area between the crystallites. These new solids show an extremely high electrocatalytic activity for the hydrogen evolution reaction (HER) in alkaline solutions which can be directly related to their nanostructure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104779
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Deformation induced crystallization due to instability in amorphous FeZr alloys (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3661-3663 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, it was shown that mechanical deformation processes can completely crystallize some amorphous transition-metal–metalloid alloys. However, the mechanism is still unclear. We demonstrate here that, for the simpler amorphous Fe90Zr10 alloy, the basic thermodynamic differences between high-energy milling and rapid quenching, associated with a crystallization controlled by elemental diffusion, could be behind this structural transformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111953
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  • 3
    Electronic Resource
    Electronic Resource
    The crystallization of amorphous Fe60Co20Si10B10 and its effect on the electrocatalytic activity for H2 evolution (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2333-2342 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The amorphous alloy Fe60Co20Si10B10 has been shown to display a high electrocatalytic activity for the hydrogen evolution in 30 wt. % KOH at 70 °C. We present, in this paper, a structural study of the crystallization process and an attempt to correlate the observed changes to the electrocatalytic behavior. The results for crystalline samples of the same average composition obtained from the melt at a lower cooling rate are also presented. Our results show that the amorphous structure is the best suited for the production of hydrogen and that the changes observed can be related in some part to the different processes of surface oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345528
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  • 4
    Electronic Resource
    Electronic Resource
    XPS investigation of surface oxidation and reduction in nanocrystalline CexLa1 - xO2 - y (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 23 (1995), S. 219-226 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Inert gas condensation was used to generate nanocrystalline La-doped CeO2 - x. Non-stoichiometric CeO2 - x-based materials were found to be excellent catalysts in recent studies for the selective reduction of SO2. To understand better the stoichiometry-related catalytic properties, the surface chemistry of nanocrystalline La-doped CeO2 - x was investigated through in situ oxidation-reduction thermal treatments. Oxidation in CO2 and reduction in H2 atmospheres were performed between 30°C and 600°C in a reaction chamber connected to a x-ray photoelectron spectrometer analytical chamber. Curve fitting and target factor analysis were used to obtain a semi-quantitative measurement of the transformation between +3 and +4 oxidation states during these reactions. Target factor analysis was found to be a very useful tool for analyzing the contributions corresponding to Ce+3 and Ce+4.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740230405
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    Paper (German National Licenses)
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