How does the strength of exchange interactions in iron oxides influence the EPR line intensity and the catalytic activity?

Abstract

Fe(III) ions may form ordered domains wherein the EPR resonance extends to the whole particle volume, leading to a major increase of spectral line intensities. This phenomenon of “strong exchange“ is known as ferromagnetic resonance (fmr). The authors observed another type of exchange, a weak one, characterized by drastically reduced resonances. Interestingly, both exchanges run parallel (up- or downwards) with the catalytic activity of iron oxide nano-particles as catalysts in the N2O-mediated selective oxidation of benzene.