鉄窒化物超微粒子の合成と磁気特性

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  • Synthesis and Some Magnetic Properties of Iron Nitride Particles
  • テツ チッカブツ チョウ ビリュウシ ノ ゴウセイ ト ジキ トクセイ

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In order to develop new magnetic recording media, fine particles of iron nitride were prepared by different two methods. In the first method, iron metal particles were nitrized with ammonia gas and in the second case, iron chloride was used as a starting material. First, acicular iron powder (0.3, μ) was nitrized with NH3-H2 gas mixture at 400°C, and γ′-Fe4N was obtained when the concentration of the NH3 was kept in the range between 65to 80%. The coercive force of thus obtained γ′-Fe4N was about 700 Oe and the saturation magnetization was about 120 emu/g. Some test magnetic tapes which were prepared by using present γ′-Fe4N showed good characteristics for the high density recording. For the second method, the vapor phase reaction in FeC12-NH3 system was studied. Three different temperatures, 780, 880 and 980°C were chosen for the reaction. The main products obtained at 780 and 880°C were Fe3N and α-Fe, while at 980°C they were γ′-Fe4N and γ-and α-iron. The shape of these products were granular or sheet like. The magnetic measurements were also carried out for these materials. The highest coercive force of the obtained materials was about 200 Oe which is not sufficient value for the magnetic recording media.

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