Abstract
The nanostructure of mechanically alloyed Sm2Fe17Nx-based magnets, which were Zn-bonded by pressure-assisted sintering at elevated temperature, was characterized by means of high-resolution and analytical transmission electron microscopy. The hard magnetic Sm2Fe17Nx grains were found to be about 100 nm in average size separated by a nonmagnetic Zn-rich phase of 5–10 nm in thickness. High-resolution imaging revealed various lattice planes in the grain boundary region which may be attributed to the presence of Γ-Fe-Zn. Obviously, this nonmagnetic phase at the grain boundaries provides additionally magnetic decoupling of the individual Sm2Fe17Nx grains, which is responsible for the coercivity increase of up to 50% induced by the pressure-assisted Zn bonding process.
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