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Strukturní vlastnosti nanometrických železných částic
David, Bohumil ; Schneeweiss, Oldřich ; Pizúrová, Naděžda ; Klementová, Mariana ; Morjan, I.
Fe-based nanoparticles were prepared by the laser pyrolysis method using a cross-flow reactor in which the laser orthogonally irradiates the gas mixture of Fe(CO)5, C2H2, and C2H4. Ethylene serves as the CO2 laser radiation absorber. The as-synthesized powder was characterised by HRTEM, XRD, Raman spectroscopy, Mössbauer spectroscopy, and magnetic measurements. As observed under TEM, the as-synthesized powder consisted of nanoparticles smaller then 10 nm embedded in a pyrolytic carbon matrix. The XRD pattern exhibited three broad peaks: the first peak is assigned to pyrolytic carbon, the second peak is assigned to maghemite/magnetite, and the third peak belongs to α-Fe particles. The particle size d 2 nm was obtained for α-Fe from the Scherrer formula. The presence of α-Fe and maghemite/magnetite phases was also observed in the Mössbauer spectrum measured at 4 K.
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Nanocompositní materiál s železnými nanočásticemi obalenými grafitem připravený dvoustupňovou procedurou
David, Bohumil ; Pizúrová, Naděžda ; Schneeweiss, Oldřich ; Bezdička, Petr ; Alexandrescu, R. ; Morjan, I. ; Cruneteanu, A. ; Voicu, I.
We describe the phase composition and magnetic properties of the nanocomposite based on iron/graphite core-shell structured nanoparticles. This nanocomposite was prepared by a two-step procedure: in the first step, the original Fe-C-N based nanopowder was synthesized by the method of laser pyrolysis of gas phase reactants, and subsequently in the second step, it was heated up to 800°C in vacuum. Annealing in vacuum induced the formation and growth of iron/graphite core-shell structured nanoparticles. Both the originally synthesized Fe-C-N based nanopowder and the annealed nanopowder were characterized by TEM, XRD and magnetic measurements. The presence of iron nanoparticles with the mean diameter of 40 nm in the annealed state of the nanopowder was proved by XRD and TEM analysis. Mössbauer spectroscopy was used to observe a qualitative change in phase composition.
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