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The microstructures of Sm2Fe17Nx (0≪x≪6) powders were observed by transmission electron microscopy (TEM). Sm2Fe17N23 powders nitrided in N2 gas have high dislocation densities due to lattice expansion. Sm2Fe17Nx powders nitrided in a mixture of NH3 and H2 gases (3≪x≪6) have cell-like structures. The dislocation density increases and the cell diameter decreases with increasing N content, and Sm2Fe17...
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