MA法による窒化鉄の作製

抄録

Mechanical alloying (MA) in NH₃ has been applied to prepare Fe₄N powder or Fe₁₆N₂ powder, where the two different kinds of iron powder, i.e., electrolytic iron powder and carbonyl iron powder, were used as the starting materials. N and O both in electrolytic iron powder and carbonyl iron powder were detected to increase in accordance with the time-length of MA. For example, after 160 hours of MA there were 12 at% N and 2 at% 0 in the specimen of electrolytic iron powder, and 11.5 at% N and 2.7 at% 0 in the specimen of carbonyl iron powder. In addition, H in the above mentioned electrolytic iron powder was confirmed to be very small amount of 17 ppm. Neither Fe₄N nor Fe16N2 were found to exist in the two kinds of mechanically alloyed specimens. However, after annealing treatment, Fe4N was observed in the both specimens, while Fe₁₆N₂ was not.