Abstract
Inorganic matrix magnetic nanocomposite, containing Fe 3C nanocrystallites, was processed by an innovative fabrication method using frontal polymerisation of iron acrylamid complex (FeAAm), followed by further pyrolysis at 873 K/150 min. The pyrolysis product was in a form of porous, irregular powder particles having broad range of size distribution, from 50 up to 500 μm. The powder particles contain nanocrystallites of Fe 3C having mean size 10–80 nm. The plot of magnetisation versus external magnetic field is characteristic of ferromagnetic material with well-defined hysteresis loops. Saturation magnetisation is 40 emu/g and slightly depends on the temperature. Substantial temperature dependence exhibits the coercivity, which decreases from 0.27 T for 4 K down to 0.06 T for 300 K. The material does not exhibit superparamagnetic behaviour.
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