Structure Analysis of Sm{sub}2(Fe,Mn){sub}17N{sub}x Magnet

摘要

It is well known that an Sm{sub}2Fe{sub}17N{sub}3 compound with a Th{sub}2Zn{sub}17-type structure has high coercive force when the single crystal size becomes 2-3μm diameter. On the other hand, it was reported that an Sm{sub}2(Fe,Mn){sub}17N{sub}x compound (x>4) had high coercive force in the size as large as 30μm diameter. In order to clarify the coercivity mechanism of the compound, microstructures were observed using a transmission electron microscope (TEM). And it was revealed that a lot of amorphous phase of approximately 5nm width existed in the crystal phase though any extra-phases were not observed before nitrogenation. According to an energy-dispersive X-ray spectroscopy, it was found that the amount of Mn of the amorphous phase was higher than that of the crystal phase [1].