Particle size determination of superparamagnetic alpha-Fe in carbon-supported catalysts by in situ Mössbauer spectroscopy

Helvig Christensen, Steen Mørup, Johannes W. Niemantsverdriet

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    Abstract

    Mössbauer spectra of a carbon-supported iron catalyst, consisting of 3.5 wt % Fe on the carbon black Carbolac-1, show that all metallic iron is superparamagnetic both at 300 and at 80 K. Spectra measured in applied magnetic fields up to 1 T confirm that the signal is due to α-Fe. Analysis of the magnetic field dependence of the spectra shows that the average diameter of the particles is 2.5 ± 0.2 nm. The sample is particularly suited for fundamental investigations of superparamagnetic relaxation and surface magnetism in metallic iron particles.

    Original languageEnglish
    Pages (from-to)4898-4900
    Number of pages3
    JournalJournal of Physical Chemistry
    Volume89
    Issue number23
    DOIs
    Publication statusPublished - 1 Dec 1985

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