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Accueil > In the headlines > Iron metal nanoparticles explain low temperature graphitization

Iron metal nanoparticles explain low temperature graphitization

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Experiments done during the PhD of Emeline Charon co-advised by J. Aléon (CSNSM) and J.-N. Rouzaud (Laboratoire de Géologie de l’ENS Paris) show that organic matter non-graphitizable by pure thermal treatment up to 3000°C aquire a graphitic structure as soon as 900°C in presence of iron metal.

Experiments done between 650°C and 1600°C reveal that the presence of iron induces the formation of iron nanoparticles within carbonaceous matter. These nanoparticles allow a reorganization of the initially microporous nanostructure, which yields a lamellar nanostructure required for graphitization. The nanostructures produced during the experiments are similar to those observed in graphitic carbons from meteorites coming from planetary bodies having recorded the first stages of core formation. This work explains the enigmatic presence of graphite by graphitization of organic matter from primitive meteorites during planetary metamorphism and is the topic of a forthcoming publication in press in Carbon.

Figure 1

View online : Publication in Carbon