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Iron nitride (Fe2N) is an iron-nitrogen system which exhibits ferromagnetism at room temperature. It has an electric field gradient at the Fe-II site. Several studies have been conducted on Fe2N in relation to magnetism at room temperature and electrochemical catalysis.
Fe2N has a high permeability and can be used as a catalyst for oxygen reduction reactions. A nanoaerogel based on Fe2N was synthesized from waste seaweed biomass. The nanoaerogel showed superior oxygen reduction reaction activity.
Fe2N nanoparticles can be produced via an ion-exchange route. However, it is still not known whether Fe2N bulk nanocomposites can be used as electrode materials. Hence, this study is aimed at determining the feasibility of Fe2N bulk nanocomposites as electrode materials.
For this purpose, a high-pressure, high-temperature sintering method was used. High-angle annular dark-field STEMmicrographs of samples treated under 45 mTorr were obtained. In addition, high-pressure Raman and UV-vis absorption spectra were acquired in a diamond anvil cell. These spectra show that a phase transition occurred during the nitridation process. This transition was followed by anisotropic distortion.
The relative stability of the phases was calculated. Results demonstrate that the phase diagram shows the combination of stable and unstable phases. Moreover, the most favourable temperature seems to be 650deg to 700deg C. Consequently, the temperature-dependent volume shrinkage effect originates from the lattice transformation during the nitridation process.
Fe2N is also studied using high-resolution XPS spectra. This is useful for revealing the chemistry of the nanoparticles. During the nitridation process, the electron density and collision rate are modified. Moreover, O-metal percentages evolve within the respective core-level spectra.
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