抄録
The microstructures of Sm2Fe17Nx (0<x<6 )powders were observed by transmission electron microscopy (TEM). Sm2Fe17N2.3 powders nitrided in N2 gas have high densities of dislocations formed by lattice expansion. Sm2Fe17Nx powders nitrided in mixed gas of NH3 and H2(3<x<6)have cell-like structures. The dislocation density increases and the cell diameter decreases with increasing N content, and Sm2Fe17N5.9 powders consist of Sm2Fe17Nx microcrystalline grains of 30∼50nm in diameter surrounded by an amorphous phase. Sm2Fe17 powders nitrided at above 600°C disproportionate into SmN and α-Fe phases with the sizes of 10∼20nm.
