SKM 2021 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 18: Posters Magnetism V
MA 18.5: Poster
Freitag, 1. Oktober 2021, 10:00–13:00, P
Structure and magnetism of Fe/Fe3C/Carbon nanocomposites: Influence of the pyrolysis conditions — •Elisavet Papadopoulou1, Nikolaos Tetos1, Aram Manukyan2, Harutyun Gyulasaryan2, Gayane Chilingaryan2, Michael Farle1, and Marina Spasova1 — 1Faculty of Physics and Center of Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, 47057 Germany — 2Institute for Physical Research of National Academy of Sciences (IPR-NAS), Ashtarak, 0203 Armenia
Carbon-encapsulated iron-cementite (Fe/Fe3C) magnetic nanoparticles were synthesized by an up-scalable solid-state pyrolysis method using iron phthalocyanine as metal precursor. The dependence of the magnetic, structural and morphological parameters on the pyrolysis conditions are presented. The nanocomposites contain α-Fe, cementite (Fe3C) and pure carbon with an average particle size of 12.5 * 2 nm. The saturation magnetization of Fe M=102 Am2/kg measured at room temperature increases by 30 % for higher synthesis temperature (973 K < T < 1173 K), indicating an increase in Fe content. This is in good agreement with the increasing volume fraction of iron from 0.5% to 8.6% in the same synthesis temperature range from the XRD. The effective magnetic anisotropy constant obtained from an analysis of approach to saturation magnetization (LAS) is 4.9 * 0.72 x 104 J/m3 at room temperature.
This work was supported by the EC project H2020-EU.4.b. - Twinning of research institutions no. 857502 (MaNaCa).