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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3871-3871 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In soft magnetic ferrites, the dispersion of the dynamic magnetic susceptibility and the maxima in the loss factor are known to be caused by the electron hopping between Fe2+ and Fe3+ ions.1 However, in the manganese ferrite system MnxFe3−xO4, two distinct electronic relaxation phenomena are reported for the compositions x=0.8, the first with an activation energy of about 0.015 eV and the second with Ea =0.06 eV.2 The elementary processes of these two relaxations are not well established; inter- and intra-atomic electron transitions between the iron ions are claimed as an interpretation,2 whereas electron transitions between iron and/or manganese ions are another interpretation.3 In the present paper, we report a detailed investigation of the magnetic relaxation effects in the manganese ferrite system, in combination with electrical conductivity measurements. The obtained results are interpreted on the basis of electronic hopping between Fe2+ and Fe3+ ions only, taking into account the effect of ionic disorder on octahedral sites, which is also the cause of the Coulomb gap formation at the metal-semiconductor transition in pure Fe3O4.4
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Process Safety Progress 17 (1998), S. 200-208 
    ISSN: 1066-8527
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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