Crystals, Vol. 15, Pages 956: Influence of Nanocrystallite Size on Magnetic Properties of Iron Nitride γ’-Fe4N

Crystals doi: 10.3390/cryst15110956

Authors:
Kamila Klimza
Grzegorz Leniec
Karol Synoradzki
Rafał Pelka
Urszula Nowosielecka
Izabela Moszyńska
Aleksander Guskos
Grzegorz Żołnierkiewicz
Nikos Guskos

In this paper, samples of nanocrystalline iron nitride γ’-Fe4N, doped with small amounts of hardly reducible promoter oxides (Al2O3, CaO, and K2O), were subjected to electron magnetic resonance (EMR) measurements. The samples differed in the average nanocrystallite size of iron nitride (23–54 nm). The EMR analysis was performed to probe the magnetic characteristics of the nanoparticles. The spectra, fitted with a Voigt function, were deconvoluted into contributions from the γ’-Fe4N phase in the nanoparticle core and from surface-associated iron ions. The resulting magnetic responses were quantitatively correlated with nanoparticle size, elucidating finite-size effects governing the system’s magnetic behavior.

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