NOVEL APPLICATIONS OF ORGANOMETALS - MAGNETIC, ETC PROPERTIES OF IRON DISPERSIONS (I) IN ZEOLITES AND (II) IN AMORPHOUS GLASS-LIKE CARBONS

The first part describes a novel technique for dispersing ultrafine species of iron oxide of controlled particle size (radii < 150 ») within the cage structure of a zeolite matrix, with the aid of organometals such as ferrocene and iron pentacarbonyl. The particle size and magnetic ordering within the iron clusters are elucidated via 57Fe Mössbauer spectrocopy and via their superparamagnetic behavior displayed by magnetization curves obtained as a function of the magnetic field and temperature. The second part of the paper describes the magnetic properties of iron species (Fe3C, Fe3O4, etc.) dispersed in amorphous glass-like carbons. These are obtained by the polymerization of furfuryl alcohol-containg ferrocene derivatives and by the subsequent pyrolysis of the polyfurfuryl alcohol. The technological relevance and applications of the materials studied in Parts I and II of the paper are pointed out. © 1979.