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Fe3C nanočástice s uhlíkovou slupkou syntetizované pomocí laserem indukované pyrolýzy Fe(CO)5
 David, Bohumil ; Pizúrová, Naděžda ; Schneeweiss, Oldřich ; Klementová, Mariana ; Dumitrache, F. ; Morjan, I. ; Alexandrescu, R.
We describe the Fe3C-based nanopowder obtained by the laser-induced pyrolysis of the gas mixture of Fe(CO)5 and C2H4. This single ferromagnetic phase nanopowder was characterized by XRD, HRTEM and Mössbauer spectroscopy. Aggregated core-shell nanoparticles were identified in the nanopowder, Fe3C cores are coated with pyrolytic carbon. The mean coherence domain size estimated by the Scherrer formula is 18 nm. Basic magnetic characteristics were measured at 20 °C: Hc = 42.0 kA/m; σ_r = 31.2 A.m2/kg; σ_s = 95.7 A.m2/kg (at 1200 kA/m). The Curie temperature Tc was 227 °C. Thermally induced phase transformations are discussed.
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