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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on Metal Catalysts. XXXIII. Characterization of Nickel-Rhenium Catalysts by Means of Ferromagnetic ResonanceUnsupported nickel-rhenium catalysts (prepared by reduction of NiO—NH4ReO4 mixtures at 400°C with hydrogen) were characterized by the method of ferromagnetic resonance. With increasing rhenium content the values of signal intensity, g-factor, and half-width of the resonance line decrease. These facts are indications for the beginning in formation of solid solutions (alloys), which increases by further treatment of the samples at higher temperatures (650°C). The advanced alloying is also indicated by the sign reversal of the anisotropy constant.
    Notes: Trägerfreie Nickel-Rhenium-Katalysatoren  -  hergestellt durch Reduktion von NiO—NH4ReO4-Gemischen mit Wasserstoff bei 400°C  -  wurden mittels der ferromagnetischen Resonanz charakterisiert. Mit steigendem Rheniumgehalt der Proben nehmen die Werte der Signalintensität, des g-Faktors und der Linienhalbwertsbreite ab. Die jeweiligen Kurvenverläufe verweisen auf beginnende Legierungsbildung, deren Ausmaß durch thermische Behandlung (650°C) zunimmt. Die fortschreitende Legierungsbildung äußert sich gleichfalls im Vorzeichenwechsel der Anisotropiekonstante.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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