Study of the reactivity of Fe(0) nanoparticles towards ammonia
Résumé
Iron nitrides, composed of environment friendly elements, have significant potential to afford sustainable magnets due to their exceptional magnetic properties 1 . Although traditional synthesis methods such as, gas nitriding, chemical vapor deposition, sputtering, chemical reduction and solvothermal synthesis are energy-intensive 2 , our team has developed an innovative approach based on their direct synthesis from iron nanoparticles 3 . In this study, we first stabilize and clean iron nanoparticles under a mixed argon/hydrogen flow. Then, a low-temperature nitridation step with ammonia is applied. The samples prepared are characterized by X-ray diffraction, and transmission electron microscopy. The results obtained show that the N content can be controlled, and pure iron nitride phases can be reached such as e.g. Fe2N, paving the way for potential applications in various technological fields.
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